Electronic pain relief device 1

This example introduces an electronic analgesic device circuit made of 556 dual time base integrated circuit, which can be used for auxiliary treatment of maternal labor analgesia and intractable headaches and other diseases.
Circuit Working Principle
The circuit of the electronic analgesic device consists of a pulse generator, a control circuit and a boost circuit, as shown in Figure 9-31.

The pulse generator (including 2Hz pulse oscillation circuit and 200Hz pulse oscillation circuit) is composed of dual time base integrated circuit IC and related peripheral components, including resistors Rl, R2, capacitor C2, diodes VDl, VD2 and ICl internal circuit, etc. 2Hz Low-frequency pulse oscillation circuit; resistors R3, R4, capacitor C3, diodes VD4, VD5 and ICl internal circuit form a 200Hz pulse oscillation circuit.
The control circuit is composed of switch Sl and capacitor C2, and its function is to control the output waveform of the pulse generator (output from pin 9 of ICl).
When S1 is turned on, the capacitor CZ is short-circuited to ground, and the pulse generator outputs a continuous pulse wave; when S1 is turned off, the pulse generator outputs a continuous pulse wave (2 times/s).
The boost circuit is composed of amplifier tube Vl, output tube V2, pulse transformer Tl and potentiometer RPl. The pulse signal output by pin 9 of ICl, after being amplified by Vl and V2, generates an electrical pulse on the secondary boost winding W2 of the pulse transformer T. The electrical pulse is transmitted to the patient through two conductive rubber electrode pads, stimulating the outer surface of the skin. layer of nerves, prompting the brain center to spontaneously produce anti-pain hormones, thereby effectively eliminating or reducing pain.
Adjusting the resistance of the potentiometer RP can control the amplitude of the output electrical pulse.
The light-emitting diode VL and the resistor R9 form a working indication circuit. When the analgesic device circuit is working normally, VL flashes and emits light.
Component selection
Rl-R4, R6-R9 all use 1/4W carbon film resistors; R5 uses 1/2W or 1W carbon film resistors; RlO uses 1/2W carbon film resistors.
RP uses small switch potentiometers used in semiconductor radios, such as the WH-l5 series synthetic carbon film potentiometers.
Both Cl and C2 use aluminum electrolytic capacitors with a withstand voltage of 5OV or more; C4 uses aluminum electrolytic capacitors with a withstand voltage of 16V or more, and C3 and C5 use polyester capacitors or monolithic capacitors.
VDl-VD5 all use lN4148 silicon switching diodes; VD6 and VD7 both use 1N4007 silicon rectifier diodes.
VL uses φ3mm red or green light-emitting diodes.
Vl can choose a transistor with a dissipation power of 30OmW, a maximum operating current of 100mA, a reverse breakdown voltage of 45V, and an operating frequency of 15OMHz, such as 3DGl30B, 3DGl2D, BC183L and other models; V2 can choose a transistor with a dissipation power of 40W and a maximum operating current. It is a transistor with a 3A, reverse breakdown voltage of 60V, and an operating frequency of 3MHz, such as 3DA72B, TIWlA and other models.
The IC selects NE556 or TS556, G556 dual time base integrated circuit.
S1 uses small self-locking buttons or toggle switches.
GB uses 9V stacked batteries.