Traditional Chinese Simple Audio Electrotherapy Apparatus (Workshop Practice) — Circuit, Wiring & Debug Guide

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In short: Traditional Chinese Simple Audio Electrotherapy Apparatus (Workshop Practice) — Circuit, Wiring & Debug Guide. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 1869 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.

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Simple audio electrotherapy instrumentFigure 48 is the circuit schematic diagram of the audio therapy device. Transistor VT1 and R and C phase-shifting circuits form a sine wave oscillator with an oscillation frequency of about 2kHz (this frequency has the best effect). VT2 is an emitter follower, which can play isolation and other functions. VT3 is the incentive level. Because audio electrotherapy does not have high requirements on waveforms, the power amplifier is composed of VT4 and VT5 and is an ordinary Class B push-pull amplifier. The output impedance of this instrument is 500Ω to match the impedance of human skin. In addition, a negative feedback (R10) is added between the output end and the excitation stage to prevent discomfort caused by sudden changes in human body impedance during treatment.Figure 48The power supply can use a general series voltage stabilizing circuit. Transformer T1 in the picture is wound with high-strength enameled wire. Its data is as follows: D310, XE6×10 iron core, …

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