CN2179991Y - Circuit comprehensive experiment detector - Google Patents

Abstract

The utility model discloses an electric field remote measuring teaching aid for teaching. The device is composed of an electric field effect sensor, a transistor switch circuit, a sound generating circuit, a sound frequency signal amplifier circuit and a power supply, and the sections are connected together. The utility model can be used for demonstrating the electrostatic field and the AC electric field through sound, light and speech. The utility model can obviously enhance students' learning interests, and at the same time, the utility model can be used for checking the high voltage line and the electric equipment in the actual work.

Description

Circuit comprehensive experiment detector

The utility model relates to a kind of device that is used to indicate the electric field existence, specifically a kind of the teaching with the teaching aid of remote measurement electric field.

In middle and primary schools' physics teaching, for the demonstration that has physical phenomenons such as electric field around frictional electricity, the electric current, still adopt traditional approach, do not make progress decades yet.Be equipped with in the catalogue also not about teaching aid at the middle school science instruments used for education with acousto-optic voice synthesis display static electric field or alternating current electric field.

But the purpose of this utility model just provides a kind of device to electrostatic field and AC field comprehensive demonstration, to improve student's learning interest, enhances memory and understands.

The utility model is achieved in that by field effect sensor, transistor switching circuit, sound generating circuit, amplifier circuit for sound frequency signal and power supply and connects to form this device.When near electrified body, sensor goes out electric field signal, and this signal makes the on-off circuit action, triggers sound generating circuit and produces sound signal, amplifies through amplifier circuit for sound frequency signal again, sends sound and light signal, thereby detects the existence of electric field.

Below in conjunction with accompanying drawing the utility model is done further and to be narrated.

Fig. 1 is a circuit block diagram of the present utility model, and wherein 1 is the field effect sensor, and 2 is transistor switching circuit, and 3 is sound generating circuit, and 4 is amplifier circuit for sound frequency signal, and 5 is power supply.

Fig. 2 is an electrical schematic diagram of the present utility model.

In Fig. 2, field effect sensor 1 is connected and composed by sensing chip 6, fet BG1 and resistance R 1, R2.Wherein sensing chip is connected on the grid of BG1, and resistance R 1, R2 are serially connected in the drain electrode of BG1, and the source electrode of BG1 connects power cathode.Sensing chip 6 can be iron or copper sheet material, also can be made into hook-shaped to make things convenient for hook to detect.When sensing chip when the electrified body, the grid of BG1 is subjected to electric field action and makes that resistance increases between drain electrode and the source electrode, the current potential of resistance R 1, R2 intermediate point raises, and sends detection signal to subsequent conditioning circuit.

Transistor switching circuit 2 is made of triode BG2 and the emitter resistance R3 that is attached thereto, and the base stage of BG2 is connected between the resistance R 1 and R2 in the field effect sensor 1.Because the effect of BG1 is risen the current potential between divider resistance R1, R2, promptly the base potential of BG2 raises, and makes the BG2 saturation conduction, the sound generating circuit of emitter output noble potential triggering following.

Sound generating circuit 3 is by language set IC1 in blocks and music integrated chip IC2 and connect and form, and is connected to switch K2 between the trigger electrode (TG) of IC1 and IC2, and the emitter of BG2 is connected with K2 in the transistor switching circuit 2.Adopt two groups of sound equipment sheets and connect form, can send two kinds of different acoustics,, enliven classroom atmosphere to improve interest.Language set IC1 in blocks can select integrated of the HFC5219 model for use, and can be set at the usefulness of measuring high-voltage electric field, and the statement that stores " Keep Clear-High Voltage " in the voice sheet is to warn.Music integrated chip IC2 can select integrated of KD128 model for use, can be set at the usefulness of measuring low voltage electric field or electrostatic field.Selection of them can realize by waver K2 at measurand.

Sound signal generation circuit 4 is done amplifier element by compound transistor BG3, BG4, and loudspeaker Y DT and LED 1 are attempted by on the collector of BG4, and the output terminal that two sound equipments in the base stage of BG3 and the sound generating circuit 3 are integrated links to each other.

After the sound equipment sheet was triggered, from output terminal (COUT) output audio signal, this signal was through amplifying from sound horn, and makes lumination of light emitting diode, and it is charged to demonstrate out testee thus.

In this device, power supply 5 is selected 2 joint dry cells for use, is connected in series K switch 1 again, filter capacitor C ₂Be attempted by the two ends of power supply and K1, LED 2 is indicated as power supply.Base stage and inter-collector at the triode BG2 of transistor switching circuit 2 also are connected with K switch 3, as the usefulness of self-check of device.

The utility model is by sound, light and speech synthesis demonstration electrostatic field and AC field, also can be used for distinguishing alternating current fire wire, zero line, it is correct etc. whether quick checking student experimenting lighting circuit connects safety, thus as a kind of circuit synthesis experiment pick-up unit, both can obviously improve students'interest in learning, also can be used as the middle and high line ball road in the real work and the detection of consumer simultaneously, have higher use value.

Claims (5)

1, a kind of circuit synthesis experiment detector, it is characterized in that the field effect sensor 1 in this detector is connected to the input end of transistor switching circuit 2, the output terminal of the input end of sound generating circuit 3 and transistor switching circuit 2 joins, amplifier circuit for sound frequency signal 4 joins with the output terminal of sound generating circuit 3, and field effect sensor 1, transistor switching circuit 2 and sound generating circuit 3 all are electrically connected with power supply 5.

2, detector according to claim 1, it is characterized in that field effect sensor 1 is connected and composed by sensing chip 6, fet BG1 and resistance R 1, R2, wherein sensing chip is connected on the grid of BG1, and resistance R 1, R2 are serially connected in the drain electrode of BG1, and the source electrode of BG1 connects power cathode.

3, detector according to claim 1 is characterized in that transistor switching circuit 2 is made of triode BG2 and the emitter resistance R3 that is attached thereto, and the base stage of BG2 is connected between the resistance R 1 and R2 in the field effect sensor 1.

4, detector according to claim 1, it is characterized in that sound generating circuit 3 is by language set IC1 in blocks and music integrated chip IC2 and connect and form, be connected to switch K2 between the trigger electrode of IC1 and IC2, the emitter of BG2 is connected with K2 in the transistor switching circuit 2.

5, detector according to claim 1, it is characterized in that amplifier circuit for sound frequency signal 4 does amplifier element by compound transistor BG3, BG4, loudspeaker Y DT and LED 1 are attempted by on the collector of BG4, and the output terminal that two sound equipments in the base stage of BG3 and the sound generating circuit 3 are integrated links to each other.

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