SU71329A3 - Sawtooth Generator - Google Patents

Description

The present invention relates to the device of the sawtooth pulse generator.

The essence of the invention is that a capacitor is connected between the grid and the cathode, charging through a large resistance from the anode battery and discharging through a diode connected by its anode to part of the turns of the secondary winding of the transformer.

FIG. 1 and 2 depict variants of such a generator on a tetrode and triode.

FIG. 1 between the control grid 3 and the cathode 2 of the tetrode / capacitor 7 is turned on, charging from the battery 8 through the resistance 9. If the voltage on the grid 3 increases, then the anode current through the winding // also increases. The secondary winding 14 of the transformer 2 is turned on so that the voltage generated by it on the anode of the diode 19 with increasing current in the winding // is negative. Due to this, the capacitor 7 with the increase of the anode current can not be discharged through the diode 19.

Thus, during the charging of the capacitor 7 in the deflecting coils 16 an oblique

9 Code Release 2. 1947

part of the sawtooth current curve.

When capacitor 7 is charged to a voltage equal to the voltage applied to diode 19 from transformer 12, capacitor 7 will begin to discharge through diode 19 and the voltage on it will begin to fall. As a result, the anode current will also begin to fall and the voltage applied to diode 19 from transformer 12 will become positive, which accelerates the discharge of the capacitor; as a result, a sharp current drop to zero is created. After the capacitor 7 is completely discharged, the whole process will be repeated again.

The sawtooth generator is synchronized with a control generator or other device by applying 4 clock pulses to the screen grid. The generator is adjusted so that its frequency in the absence of control is slightly lower than the frequency of the clock pulses. The circuit provides a switch 17, 18 and resistance 13.

The generator shown in FIG. 2 differs from the generator in FIG. / only by the fact that instead of a tetrode, a triode 2 / is applied in it. Generator129

the torus is synchronized by applying clock pulses to the control grid of the lamp 21. The pulses are supplied directly or through the winding 14 of the transformer (Fig. 2).

Patent Subject

1. A generator of saw-tooth pulses with an electron tube, in the anode circuit of which a transformer with iron is turned on, which serves to provide feedback, characterized in that it controls

the grid is clamped to the cathode by a capacitor receiving a positive charge from the anode battery through a large resistance and discharging through a diode connected by its anode to part of the turns of the secondary winding of the transformer,

2. The form of the generator according to p. 1, in which the triode is applied, the discharge diode is connected by its anode to the end of the secondary winding opposite to the grid one.

, one

Aii

Synchronization