CN107046412B - Weight resistance type electrocardiosignal generator - Google Patents

Abstract

The invention relates to a resistance-type electrocardiogram signal generator, which belongs to the technical field of medical instruments. The invention includes a signal adaptation module, a weight resistance network and a signal distribution module, an oscillation module, a signal control module, and a power supply module; the power supply module is respectively connected with the weight resistance network and the signal distribution module, the oscillation module, and the signal control module , the oscillation module, the weight resistance network, the signal distribution module, and the signal adaptation module are sequentially connected. The invention can be used in the maintenance of the electrocardiogram machine and the monitor, the inspection of the alarm setting, the test of the lead cables of the electrocardiogram machine and the monitor, and the occasions of medical teaching and research. It has the advantages of simple structure, small size, low power consumption, easy manufacture, high reliability, high precision, cheap price and strong practicability.

Description

A Weighted Resistive ECG Signal Generator

technical field

The invention relates to a weight resistance type electrocardiogram signal generator, which belongs to the technical field of medical instruments.

Background technique

The ECG signal generator is a low-frequency signal source, widely used in medical instrument maintenance, testing, demonstration and teaching experiments and other fields. In hospitals, monitors and electrocardiographs are the most commonly used first aid and life support equipment in clinical practice. Electrocardiogram machines and monitors are directly used on patients and are directly related to the health and life safety of patients. When the electrocardiograph and monitor break down for maintenance. In order to ensure the accuracy of the parameters of the monitor and electrocardiograph, it is generally necessary to check whether each lead is working normally. At this time, an ECG signal generator can be used instead of the human body for preliminary inspection for debugging. This is safe and secure, and avoids unsafe hidden dangers caused by using the human body for inspection.

Most of the ECG signal generators used in my country are imported and expensive. And when there is a failure, it is troublesome to repair, and the cost is relatively high. Most of the domestically produced components are composed of discrete components, which are bulky, have few functions, low precision, and poor versatility.

Contents of the invention

The technical problem to be solved by the present invention is: the present invention provides a weighted resistance electrocardiographic signal generator with simple circuit, high reliability, high precision, low power consumption, small size and low price. Integrated chip for signal processing, 18650 battery power supply or USB power supply (the battery can be charged at the same time), can output 30-120 beats/min heart rate signal, and has an R wave signal output interface, which solves the problem of discrete components composing ECG signals The generator has problems such as large volume, few functions, low precision, poor versatility, and inconvenient maintenance.

The technical solution of the present invention is: a weighted resistance ECG signal generator, including a signal adaptation module 1, a weighted resistance network and a signal distribution module 2, an oscillation module 3, a signal control module 4, and a power supply module 5; the power supply modules 5 are respectively It is connected with the weight resistance network and the signal distribution module 2, the oscillation module 3, and the signal control module 4, and the signal control module 4, the oscillation module 3, the weight resistance network, the signal distribution module 2, and the signal adaptation module 1 are sequentially connected; The power supply module 5 raises the battery voltage from 3.6V to 5V through a switch booster to supply power;

The signal control module 4 is a monostable timer, and the trigger signal is provided by the weight resistor network and the signal distribution module 2;

The oscillating module 3 generates a rectangular wave signal for use by the weight resistance network and the signal distribution module 2, while the oscillating signal is controlled by the signal control module 4;

The weight resistance network and the signal distribution module 2 generate electrocardiographic signals and R wave output;

In the signal adaptation module 1, the signal output by the weight resistor network and the signal distribution module 2 is filtered by RC and then capacitively coupled to the two-stage resistor divider to attenuate the signal by about 48-68dB in total, and the signal is divided by LA, RA, The ECG signal is output in the form of RL.

The signal adaptation module 1 includes an electrocardiographic left arm signal output terminal LA, an electrocardiographic right arm signal output terminal RA, an electrocardiographic right leg drive signal output terminal RL; a resistor R11, a resistor R12, a resistor R13, a resistor R14, and a resistor R15 , ECG output signal amplitude adjustment potentiometer RV1, filter capacitor C1, coupling capacitor C2, anti-interference capacitor C3;

One end of the resistor R11 in the signal adaptation module 1 is connected to the weighting resistor network and the output end of the signal distribution module 2, the other end of the resistor R11 is connected to the positive pole of the filter capacitor C1 and the positive pole of the coupling capacitor C2, and the negative pole of the filter capacitor C1 is grounded The negative pole of the coupling capacitor C2 is connected to a fixed end of the electrocardiographic output signal amplitude adjustment potentiometer RV1, and the other fixed end of the electrocardiographic output signal amplitude adjustment potentiometer RV1 is connected in series with the resistor R12 and grounded, and the electrocardiographic output signal amplitude The anti-interference capacitor C3 is connected in parallel between the sliding contact of the adjustment potentiometer RV1 and the ground, and at the same time it is connected to one end of the resistor R13; the other end of the resistor R13 is connected in series with the resistor R14 and the resistor R15; the connection point of the resistor R13 and the resistor R14 is connected The connection point of resistor R14 and resistor R15 is connected to the output terminal RL of the driving signal of the right leg of the ECG; the other end of the resistor R15 is grounded and used as the output terminal RA of the right arm signal of the ECG.

The weight resistor network and signal distribution module 2 includes 4017 chip U1, 4069 inverting chip U4, light emitting diode DR, diode D0-D9, resistor R0-R10, resistor R16, resistor R17, R wave output port RW-OUT;

The weight resistance network and the 16-pin of the chip U1 in the signal distribution module 2 are connected to +5V, the 8-pin is grounded, the 14-pin is connected to the 3-pin of the 555 chip U2 in the oscillation module 3, the 13-pin and 15-pin of U1 are grounded; the 3, Pins 2, 4, 7, 10, 1, 5, 6, 9, and 11 are respectively connected to the anodes of diodes D0-D9, and pin 10 of U1 is also connected to pin 3 of U4:B, and pin 11 of U1 is connected to the signal control Capacitor C8 in module 4 is connected; pin 4 of U4:B is connected to pin 5 of U4:C and the negative pole of LED DR; pin 14 of chip U4 is connected to +5V and pin 7 is grounded; the positive pole of LED DR is connected to the resistor R17 is connected in series to +5V power supply; U4: C pin 6 is connected in series with resistor R16 to R wave output port RW-OUT, and the other end of the output port is grounded; the cathodes of diodes D0-D9 are respectively connected to one end of resistors R0-R9 , The other ends of the resistors R0-R9 are connected together and then connected to the ground via R10.

The oscillation module 3 includes 555 chips U2, 4069 inverting chips U4:A, resistor R18, resistor R19, capacitor C4, capacitor C5;

Pin 8 of 555 chip U2 in oscillation module 3 is connected to +5V, pin 1 is grounded, pin 5 is grounded through capacitor C4, pin 4 is connected to pin 2 of chip U4:A, pin 1 of chip U4:A is connected to pin 1 of signal control module 4 Connect pin 3 of chip U3; pin 14 of chip U4 is connected to +5V, pin 7 is grounded; pin 2 of chip U2 is connected to pin 6 and then grounded via C5, and also connected to one end of R19, the other end of R19 and one end of R18 Connected to the 7th pin of the chip U2 at the same time; the other end of R18 is connected to +5V;

The signal control module 4 includes a 555 chip U3, a diode D10, a resistor R20, a resistor R21, a heart rate regulating potentiometer RV2, a capacitor C6, a capacitor C7, and a capacitor C8;

In signal control module 4, pin 8 of 555 chip U3 is connected to +5V, pin 1 is grounded, and pin 5 is grounded through capacitor C7; pin 2 of chip U3 is connected to the positive pole of diode D10, one end of resistor R21, and one end of capacitor C8; The negative electrode is connected to pin 4 of chip U3, the other end of resistor R21 is connected to +5V, the other end of capacitor C8 is connected to the resistance network and pin 11 of chip U1 in signal distribution module 2; pin 6 and pin 7 of 555 chip U3 are connected via Capacitor C6 is grounded and connected to one end of resistor R20 at the same time; the other end of resistor R20 is connected to a fixed end of heart rate adjustment potentiometer RV2, and the other fixed end of heart rate adjustment potentiometer RV2 is connected to its sliding contact and then connected to +5V power supply ;

The power module 5 includes a MAX1724EZK50 chip U5, a boost inductor L1, a filter capacitor CP1, a filter capacitor CP2, capacitors C9-C16, a power switch SW, a battery BAT, a light emitting diode DP, a resistor R22, a diode D11, and a USB interface J1;

The positive pole of the battery BAT 18650 in the power module 5 is connected to the negative pole of the diode D11, and at the same time connected to the positive pole of the capacitor CP1, pins 1 and 3 of the chip U5, and one end of the inductor L1 through the switch SW; the positive pole of the diode D11 is connected to the USB interface J1 The 1 pin of the LED, the positive pole of the light-emitting diode DP is connected, the negative of the light-emitting diode DP is connected in series with the resistor R22 and grounded; the other end of the inductor L1 is connected to the 5-pin of the chip U5, the 4-pin of the chip U5 is connected to the positive pole of the capacitor CP2, and the capacitor C9- Connect the positive pole of C12, one end of capacitor C13-C16, the negative pole of battery BAT, the negative pole of capacitor CP1, the 2 pins of chip U5, the negative pole of capacitor CP2, the negative pole of capacitor C9-C12, and the other end of capacitor C13-C16 to the USB interface The 4 pins of J1 are connected together.

The beneficial effect of the present invention is that it can be used in the maintenance of electrocardiographs and monitors, inspection of alarm settings, testing of lead cables of electrocardiographs and monitors, and medical teaching and research occasions. It has the advantages of simple structure, small size, low power consumption, easy manufacture, high reliability, high precision, cheap price and strong practicability.

Description of drawings

Fig. 1 is a circuit schematic diagram of the signal adaptation module of the present invention;

Fig. 2 is a circuit schematic diagram of a resistance network and a signal distribution module of the present invention;

Fig. 3 is a circuit schematic diagram of the oscillation module of the present invention;

Fig. 4 is a circuit schematic diagram of the signal control module of the present invention;

Fig. 5 is a circuit schematic diagram of the power supply module of the present invention;

Fig. 6 is a circuit schematic diagram of the present invention;

Fig. 7 is a circuit connection block diagram of the present invention;

Fig. 8 is a typical electrocardiogram waveform of the present invention; Wherein the abscissa: time, represented by the paper-feeding speed (25mm/s) of the electrocardiograph, and the ordinate: voltage value (1mV/10mm). The picture is an electrocardiogram (ECG)) waveform, (P, Q, R, S, T, U wave) where: R wave 2mV, heart rate 72 beats/min.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1: As shown in Figure 1-8, a weighted resistance type ECG signal generator includes a signal adaptation module 1, a weighted resistance network and a signal distribution module 2, an oscillation module 3, a signal control module 4, and a power supply module 5; the power supply module 5 is respectively connected with the weight resistance network and the signal distribution module 2, the oscillation module 3, and the signal control module 4, the signal control module 4, the oscillation module 3, the weight resistance network and the signal distribution module 2, and the signal adaptation module 1 connected sequentially; the power module 5 raises the battery voltage from 3.6V to 5V through a switch booster for power supply;

The signal control module 4 is a monostable timer, and the trigger signal is provided by the weight resistor network and the signal distribution module 2;

The oscillating module 3 generates a rectangular wave signal for use by the weight resistance network and the signal distribution module 2, while the oscillating signal is controlled by the signal control module 4;

The weight resistance network and the signal distribution module 2 generate electrocardiographic signals and R wave output;

In the signal adaptation module 1, the signal output by the weight resistor network and the signal distribution module 2 is filtered by RC and then capacitively coupled to the two-stage resistor divider to attenuate the signal by about 48-68dB in total, and the signal is divided by LA, RA, The ECG signal is output in the form of RL.

As a preferred solution of the present invention, the specific signal adaptation module 1, weight resistance network and signal distribution module 2, oscillation module 3, signal control module 4, and power supply module 5 can adopt the following design:

The signal adaptation module 1 includes an electrocardiographic left arm signal output terminal LA, an electrocardiographic right arm signal output terminal RA, an electrocardiographic right leg drive signal output terminal RL; a resistor R11, a resistor R12, a resistor R13, a resistor R14, and a resistor R15 , ECG output signal amplitude adjustment potentiometer RV1, filter capacitor C1, coupling capacitor C2, anti-interference capacitor C3;

One end of the resistor R11 in the signal adaptation module 1 is connected to the weight resistor network and the output end of the signal distribution module 2 (R10 is not grounded), and the other end of the resistor R11 is connected to the positive pole of the filter capacitor C1 and the positive pole of the coupling capacitor C2, The negative pole of the filter capacitor C1 is grounded; the negative pole of the coupling capacitor C2 is connected to a fixed end of the ECG output signal amplitude adjustment potentiometer RV1, and the other fixed end of the ECG output signal amplitude adjustment potentiometer RV1 is connected in series with the resistor R12 and grounded The anti-interference capacitor C3 is connected in parallel between the sliding contact of the electrocardiographic output signal amplitude adjustment potentiometer RV1 and the ground, and is connected with one end of the resistor R13 at the same time; the other end of the resistor R13 is connected in series with the resistor R14 and the resistor R15; the resistor R13 and The connection point of the resistor R14 is connected to the left arm signal output terminal LA of the ECG; the connection point of the resistor R14 and the resistor R15 is connected to the right leg drive signal output terminal RL of the ECG; the other end of the resistor R15 is grounded and used as the right arm signal of the ECG Output RA.

In the signal adaptation module 1, the signal output by the weight resistor network and the signal distribution module 2 is filtered by RC and then capacitively coupled to the secondary resistor divider, and the signal is attenuated by about 48-68dB (adjusted by RV1), making the R wave The amplitude is about 1.5mV and the ECG signal is output in the form of LA, RA, and RL (leads I, II, and III can be used).

The weight resistor network and signal distribution module 2 include 4017 chip U1, 4069 inverting chip U4 (4069U4:B, U4:C), light emitting diode DR, diode D0-D9, resistor R0-R10, resistor R16, resistor R17, R wave output port RW-OUT;

The weight resistance network and the 16-pin of the chip U1 in the signal distribution module 2 are connected to +5V, the 8-pin is grounded, the 14-pin is connected to the 3-pin of the 555 chip U2 in the oscillation module 3, the 13-pin and 15-pin of U1 are grounded; the 3, 2, 4, 7, 10, 1, 5, 6, 9, and 11 pins (ten pins) are respectively connected to the anodes of diodes D0-D9, and the 10 pins of U1 are also connected to the 3 pins of U4:B, and the 3 pins of U1 Pin 11 is connected to capacitor C8 in signal control module 4; pin 4 of U4:B is connected to pin 5 of U4:C and the cathode of light-emitting diode DR; pin 14 of chip U4 is connected to +5V and pin 7 is grounded; The positive electrode of the diode is connected in series with the resistor R17 and then connected to the +5V power supply; the 6 pins of U4:C are connected in series with the resistor R16 and then connected to the R wave output port RW-OUT, and the other end of the output port is grounded; the negative electrodes of the diodes D0-D9 are respectively connected to the resistor R0 - One end of R9 is connected, the other end of resistor R0-R9 is connected together, and then connected to ground via R10.

The weight resistance network and the signal distribution module 2 generate electrocardiographic signals and R wave outputs. The 20Hz signal output by the oscillation module 3 is used as the clock pulse input of U1 (4017), so that the Q0-Q9 output terminals of U1 generate a series of high-level pulses in turn, which are respectively added to the resistors R0-R9 through diodes D0-D9, which determines the The voltage at the common end of the output resistor R10. By selecting the resistance parameters, P, Q, R, S, T, and U waveforms can be sequentially output according to the order of the ECG waveforms. After one cycle of waveform output is completed, the low level output of Q9 is applied to the signal control module 4 to control its heart rate, and the light-emitting diode (LED) DR can indicate the R wave signal, and the R wave can be output by the output port RW-OUT.

The oscillation module 3 includes a 555 chip U2, a chip U4 (4069U4: A), a resistor R18, a resistor R19, a capacitor C4, and a capacitor C5;

The oscillating module 3 generates a 20 Hz rectangular wave signal for use by the weighting resistor network and the signal distribution module 2 , while the oscillating signal is controlled by the signal control module 4 .

Pin 8 of 555 chip U2 in oscillation module 3 is connected to +5V, pin 1 is grounded, pin 5 is grounded through capacitor C4, pin 4 is connected to pin 2 of chip U4:A, pin 1 of chip U4:A is connected to pin 1 of signal control module 4 Connect pin 3 of chip U3; pin 14 of chip U4 is connected to +5V, pin 7 is grounded; pin 2 of chip U2 is connected to pin 6 and then grounded via C5, and also connected to one end of R19, the other end of R19 and one end of R18 Connected to the 7th pin of the chip U2 at the same time; the other end of R18 is connected to +5V;

The signal control module 4 includes a 555 chip U3, a diode D10, a resistor R20, a resistor R21, a heart rate regulating potentiometer RV2, a capacitor C6, a capacitor C7, and a capacitor C8;

In signal control module 4, pin 8 of 555 chip U3 is connected to +5V, pin 1 is grounded, and pin 5 is grounded through capacitor C7; pin 2 of chip U3 is connected to the positive pole of diode D10, one end of resistor R21, and one end of capacitor C8; The negative electrode is connected to pin 4 of chip U3, the other end of resistor R21 is connected to +5V, the other end of capacitor C8 is connected to the resistance network and pin 11 of chip U1 in signal distribution module 2; pin 6 and pin 7 of 555 chip U3 are connected via Capacitor C6 is grounded and connected to one end of resistor R20 at the same time; the other end of resistor R20 is connected to a fixed end of heart rate adjustment potentiometer RV2, and the other fixed end of heart rate adjustment potentiometer RV2 is connected to its sliding contact and then connected to +5V power supply ;

The power module 5 includes MAX1724EZK50 chip U5, boost inductor L1, filter capacitor CP1, filter capacitor CP2, capacitors C9-C16, power switch SW and battery BAT (18650), light emitting diode DP, resistor R22, diode D11, USB interface J1;

The positive pole of the battery BAT 18650 in the power module 5 is connected to the negative pole of the diode D11, and at the same time connected to the positive pole of the capacitor CP1, pins 1 and 3 of the chip U5, and one end of the inductor L1 through the switch SW; the positive pole of the diode D11 is connected to the USB interface J1 The 1 pin of the LED, the positive pole of the light-emitting diode DP is connected, the negative of the light-emitting diode DP is connected in series with the resistor R22 and grounded; the other end of the inductor L1 is connected to the 5-pin of the chip U5, the 4-pin of the chip U5 is connected to the positive pole of the capacitor CP2, and the capacitor C9- Connect the positive pole of C12, one end of capacitor C13-C16, the negative pole of battery BAT, the negative pole of capacitor CP1, the 2 pins of chip U5, the negative pole of capacitor CP2, the negative pole of capacitor C9-C12, and the other end of capacitor C13-C16 to the USB interface The 4 pins of J1 are connected together (common ground).

The power supply module 5 can raise the voltage of the 18650 battery (3.6V) to 5V to supply power or use the USB interface to supply power (the 18650 battery can be charged at the same time).

The working principle of the present invention is:

Firstly, the oscillating module 3 generates a 20Hz rectangular wave signal, which is sent to the CLK terminal of U1. U1 (4017) is a pulse sequence generator, and the 20Hz oscillating signal is used as the clock pulse input of the pulse sequence generator, so that the Q0- The output terminal of Q9 generates a series of high-level pulses in turn, which are isolated by diodes D0-D9 and added to resistors R0-R9 with different resistance values, and the voltage of the output common terminal is determined on the output resistor R10. By selecting the resistance parameters (weights), P, Q, R, S, T, U waveforms can be sequentially output according to the order of the ECG waveforms. When Q9 is at a high level, the signal control module 4 generates a monostable signal through C8 and enters a temporary stable state. The time is determined by the variable resistor of RV2680KΩ, thereby controlling the number of pulses per minute to vary between 30 and 120 . DR flashes once every time a pulse is generated. After one cycle of waveform output is completed, Q9 outputs low level, and the signal control module 4 outputs low level. After U4:A inverts, pin 4 of U4 is high level, and continues to generate an oscillating signal to trigger U2 to generate a cycle. ECG signal, so cycle. R wave (rectangular wave) can be output by the output port RW-OUT.

Then, in the signal adaptation module 1, the signal output by the weight resistor network and the signal distribution module 2 is filtered by RC (resistor R11, capacitor C1), and then coupled to the secondary resistor divider by the capacitor (C2) to attenuate the signal by about 48 -68dB (the size is adjusted by RV1), so that the amplitude of the R wave (regular) is about 1.5mV, and the ECG signal is output in the form of LA, RA, and RL (leads I, II, and III can be used for measurement).

The power module 5 can raise the 18650 battery voltage from 3.6V to 5V through U5 (MAX1724EZK50 DC-DC switching booster) or use the USB interface (which can charge the 18650 battery at the same time) as the power supply of the signal generator.

Fig. 8 is a typical electrocardiogram waveform of the present invention; Wherein the abscissa: time, represented by the paper-feeding speed (25mm/s) of the electrocardiograph, and the ordinate: voltage value (1mV/10mm). The picture is an electrocardiogram (ECG)) waveform, (P, Q, R, S, T, U wave) where: R wave 2mV, heart rate 72 beats/min.

The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and can also be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. Variations.

Claims (2)

1. A weight resistance type electrocardiosignal generator is characterized in that: the system comprises a signal adaptation module (1), a weight resistor network, a signal distribution module (2), an oscillation module (3), a signal control module (4) and a power supply module (5); the power supply module (5) is respectively connected with the weight resistor network, the signal distribution module (2), the oscillation module (3) and the signal control module (4), the oscillation module (3), the weight resistor network, the signal distribution module (2) and the signal adaptation module (1) are sequentially connected; the power supply module (5) is used for boosting the battery voltage to 5V through a switch booster to supply power;

the signal control module (4) is a monostable timer, and the trigger signal is given by the weight resistor network and the signal distribution module (2);

the oscillating module (3) generates a rectangular wave signal for the weight resistor network and the signal distribution module (2) to use, and the oscillating signal is controlled by the signal control module (4);

the weight resistor network and the signal distribution module (2) generate electrocardiosignals and R wave output;

the signal adapting module (1) filters the signals output by the weight resistor network and the signal distribution module (2) through RC, then couples the signals to the secondary resistor voltage divider through capacitance, attenuates the signals by 48-68dB altogether, and outputs electrocardiosignals in the forms of LA, RA and RL;

the weight resistor network and signal distribution module (2) comprises 4017 chips U1 and 4069 inverted chips U4:B and U4:C, light emitting diodes DR, diodes D0-D9, resistors R0-R10, a resistor R16, a resistor R17 and an R wave output port RW-OUT;

the 16 pin of the chip U1 in the weight resistor network and signal distribution module (2) is connected with +5V, the 8 pin is grounded, the 14 pin is connected with the 3 pin of the 555 chip U2 in the oscillation module (3), and the 13 pin and the 15 pin of the chip U1 are grounded; the 3, 2, 4, 7, 10, 1, 5, 6, 9 and 11 pins of U1 are respectively connected with the anodes of the diodes D0-D9, wherein the 10 pin of U1 is also connected with the 3 pin of U4B, and the 11 pin of U1 is connected with a capacitor C8 in the signal control module (4); the 4 pin of U4B is connected with the 5 pin of U4C and the cathode of the light-emitting diode DR; the 14 pins of the 4069 reversed-phase chip U4:B and U4:C are connected with +5V and 7 pins to be grounded; the positive electrode of the light-emitting diode DR is connected with a resistor R17 in series and then connected with a +5V power supply; the 6 pin of U4 is connected with the resistor R16 in series and then connected to the R wave output port RW-OUT, and the other end of the output port is grounded; the cathodes of the diodes D0-D9 are respectively connected with one ends of the resistors R0-R9, and the other ends of the resistors R0-R9 are connected together and then connected to the ground through R10;

the signal adaptation module (1) comprises an electrocardio left arm signal output end LA, an electrocardio right arm signal output end RA and an electrocardio right leg driving signal output end RL; the electrocardio output signal amplitude adjusting potentiometer RV1, the filter capacitor C1, the coupling capacitor C2 and the anti-interference capacitor C3 are arranged on the resistor R11, the resistor R12, the resistor R13, the resistor R14, the resistor R15 and the electrocardio output signal;

one end of a resistor R11 in the signal adapting module (1) is connected with the weighting resistor network and the output end in the signal distributing module (2), the other end of the resistor R11 is connected with the positive electrode of the filter capacitor C1 and the positive electrode of the coupling capacitor C2, and the negative electrode of the filter capacitor C1 is grounded; the negative electrode of the coupling capacitor C2 is connected with one fixed end of the electrocardio output signal amplitude adjustment potentiometer RV1, the other fixed end of the electrocardio output signal amplitude adjustment potentiometer RV1 is connected with the resistor R12 in series and then grounded, and an anti-interference capacitor C3 is connected between the sliding contact of the electrocardio output signal amplitude adjustment potentiometer RV1 and the ground in parallel and is connected with one end of the resistor R13; the other end of the resistor R13 is connected with the resistor R14 and the resistor R15 in series; the connection point of the resistor R13 and the resistor R14 is connected with the electrocardio left arm signal output end LA; the connection point of the resistor R14 and the resistor R15 is connected with an electrocardiograph right leg driving signal output end RL; the other end of the resistor R15 is grounded and simultaneously serves as an electrocardiographic right arm signal output end RA.

2. The weight-resistant electrocardiograph signal generator according to claim 1, wherein: the oscillating module (3) comprises 555 chips U2 and 4069 inverted chips U4, namely A, a resistor R18, a resistor R19, a capacitor C4 and a capacitor C5;

the 8 pin of the 555 chip U2 in the oscillation module (3) is connected with +5V, the 1 pin is grounded, the 5 pin is grounded through a capacitor C4, the 4 pin is connected with the 2 pin of the chip U4A, and the 1 pin of the chip U4A is connected with the 3 pin of the chip U3 in the signal control module (4); the 14 pins of the 4069 reversed-phase chip U4A are connected with +5V and 7 pins to be grounded; the pin 2 and the pin 6 of the chip U2 are connected and grounded through C5, and meanwhile, one end of the R19 is also connected, and the other end of the R19 is connected with one end of the R18 and is connected to the pin 7 of the chip U2; the other end of R18 is connected with +5V;

the signal control module (4) comprises a 555 chip U3, a diode D10, a resistor R20, a resistor R21, a heart rate adjusting potentiometer RV2, a capacitor C6, a capacitor C7 and a capacitor C8;

the 8 pin of the 555 chip U3 in the signal control module (4) is connected with +5V, the 1 pin is grounded, and the 5 pin is grounded through a capacitor C7; the pin 2 of the chip U3 is connected with the anode of the diode D10, one end of the resistor R21 and one end of the capacitor C8; the negative electrode of the diode D10 is connected with the 4 pin of the chip U3, the other end of the resistor R21 is connected with +5V, the other end of the capacitor C8 is connected with the resistor network and the 11 pin of the chip U1 in the signal distribution module (2); the pin 6 and the pin 7 of the 555 chip U3 are connected with the ground through a capacitor C6, and are connected with one end of a resistor R20; the other end of the resistor R20 is connected with one fixed end of the heart rate adjusting potentiometer RV2, and the other fixed end of the heart rate adjusting potentiometer RV2 is connected with a sliding contact of the heart rate adjusting potentiometer RV2 and then is connected to a +5V power supply;

the power module (5) comprises a MAX1724EZK chip U5, a boost inductor L1, a filter capacitor CP2, capacitors C9-C16, a power switch SW, a battery BAT, a light emitting diode DP, a resistor R22, a diode D11 and a USB interface J1;

the positive electrode of the battery BAT 18650 in the power module (5) is connected with the negative electrode of the diode D11, and is connected with the positive electrode of the capacitor CP1, the pins 1 and 3 of the chip U5 and one end of the inductor L1 through the switch SW; the positive electrode of the diode D11 is connected with the pin 1 of the USB interface J1, the positive electrode of the light emitting diode DP, and the negative electrode of the light emitting diode DP is connected with the resistor R22 in series and then grounded; the other end of the inductor L1 is connected with the 5 pin of the chip U5, the 4 pin of the chip U5 is connected with the positive electrode of the capacitor CP2, the 5 pin of the chip U5 is connected with the positive electrodes of the capacitors C9-C12 and one ends of the capacitors C13-C16, the negative electrode of the battery BAT, the negative electrode of the capacitor CP1, the 2 pin of the chip U5, the negative electrode of the capacitor CP2, the negative electrode of the capacitor C9-C12 and the other end of the capacitor C13-C16 are connected with the 4 pin of the USB interface J1 together and are grounded.

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