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Circuit Operation Principle The electric pulse therapy device circuit consists of a self-excited oscillator, a start-up delay circuit, a low-frequency pulse voltage generator and a timing control circuit, as shown in Figure 9-5. 
The self-excited oscillator circuit is composed of the 8-11-pin circuit of the NOT gate integrated circuit 1C2 and the resistors R8 and R9, the potentiometer RP2, and the capacitor C3.
The power-on delay circuit consists of the circuit and capacitor C1 in the 12th and 13th pins of IC2, the resistor saturating-R6, the transistor Vl, and the diodes VDl and VD2.
The low-frequency pulse voltage generator circuit is composed of an AND gate integrated circuit lCl, a non-gate integrated circuit IC2, transistors V3, V4, a diode VD4-VD6, an inductor L, a resistor R13-R16, a potentiometer RP1, a light-emitting diode VL, a capacitor C7, and the like. composition.
The timing control circuit is composed of the counter integrated circuit IC3, 1C2 inner 1-6 pin circuit, transistor V2, resistor R7, RlO-Rl2, capacitor C2, C5, C6 and diode VD3.
After the power switch S is turned on, the timing control circuit starts counting after power-on reset. The 1 pin (Q12 end) of IC3 outputs a low level, so that V2 is saturated and the working power of lCl and IC2 is turned on.
The low-frequency pulse signal generated by the self-excited oscillator is amplified by ICl, and the pulse signal with a pulse width of 0-3ms is continuously output from the 3 pin of IC1, and is applied to the base of V3 through VD4 and R13 to make the V3 intermittent guide. through. When IC1's 3 pin outputs a high level, V3 is saturated and turned on; when lC1's 3 pin outputs a low level, V3 is turned off. As V3 is continuously turned on and off, a self-inductance pulse voltage is generated on L, which is applied to the acupuncture points of the human body through electrodes a and b.
At the same time, the pulse signal output from pin 4 of IC1 is applied to the base of V4 through R14, so that V4 is also turned on intermittently, and VL flashes. When the 4 pin of IC1 outputs a high level, V4 is turned on, and VLA is turned on; when the 4 pin of lC1 outputs a low level, V4 is turned off, and VL is turned off.
After V2 is saturated and turned on, Vl is also saturated and turned on, so that electrodes a and b have no pulse voltage output just after turning on. With the charging of Cl, Vl exits the saturation state, so that the amplitude of the differential pulse signal input to the 2 pin of ICl is gradually widened, and the amplitude of the pulse voltage on the electrodes a and b also increases. About 7s, Cl is charged, Vl is cut off, the delay is over, and the pulse voltage on electrodes a and b is adjusted by RPl.
When the timing time (30min) is over, IC1's 1 pin outputs a high level, so that V2 is turned off, ICl and IC2 are powered off and stopped, V3 and V4 are turned off, and the pulse voltages on electrodes a and b disappear.
Adjusting the resistance of RP2 changes the oscillation frequency of the self-excited oscillator, thereby changing the frequency of the pulse voltage.
Component selection
RlLRl6 uses 1/4W metal film resistors.
RPl selects a small synthetic carbon film potentiometer with switch (power switch S); RP2 selects a small synthetic carbon film potentiometer without switch.
Both Cl and C5 are aluminum electrolytic capacitors with a withstand voltage of 16V; C2-C4 and C6 are both monolithic capacitors; C7 is an aluminum electrolytic capacitor with a withstand voltage of 160V.
VDl-VD4 selects 1N4148 type silicon switch diode for use; VD5 and VD6 select 1N4007 type silicon rectifier diode for use.
VL selects a common light-emitting diode of φ5mm.
Vl and V4 select 2SC3330 or S8050 type silicon NPN transistor; V2 selects S8550 type PNP transistor; V3 selects 3DGl80G or 2SC2909, 3DA87 and other types of silicon NPN transistor.
L uses the primary winding of the lW power transformer.
ICl selects CD4081 type four-gate integrated circuit for IC; IC2 selects CD4069 type six-gate integrated circuit for IC2; IC3 selects CD4040 type 12-bit binary serial meter for "digital integrated circuit."
GB uses 4 No. 5 dry batteries or 6V laminated batteries.
The electrodes a, b are made of two round thin copper sheets or used as a finished conductive rubber electrode sheet.