Electroacupuncture stimulator for professionals. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electronics in medicine
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The proposed stimulator (EAS) generates short pulses with an amplitude of up to 70V. For the calming mode, continuous pulses are applied (switch position 4), and for the excitation mode, 3 more types of pulses are used. In position 1, there are pulses with a period of 2 s. and a duty cycle of 4. In position 2,3, the output pulses with a period of 2 s., 3s. respectively (meander). The circuit in Fig. 1 consists of two generators assembled on a D1 chip, a driver on D2, D3 chips. Mixer on transistor assembly 166NT1. The voltage converter is assembled on transistors T1, T2, a transformer on a ferrite ring and a rectifier on diodes VD6-VD9, filter C7, R7. The output uses a diode bridge VD1-VD4 and smoothing capacitors C4, C5 for the normal operation of the measuring device.
The fill generator frequency is controlled by resistor R2 from 8 to 100 Hz. The frequency of the second generator is changed discretely by connecting the resistor R5. Resistor R9 is selected so that at the maximum amplitude the top of the output pulses is sharp. R12 is selected according to the minimum current consumption from the power source. The resistor R8 regulates the amplitude of the output voltage, and, consequently, the current, controlling the current with a measuring device. It is desirable to maintain the current within 10 - 20 A.
(click to enlarge)
The printed circuit board is shown in fig. 2.
For a portable (camping) version, the output bridge, filter capacitors and measuring device can be removed by taking the output directly from capacitor C6. Metal photographic tweezers are attached to the ground terminal for attaching to the toes or fingers. For a camping option, you can make a clothespin with one metallized sponge, or just a suitable piece of metal is clamped in a fist.
The device showed amazing viability for almost 20 years of operation.
Publication: cxem.net
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