Traditional Chinese DZ-1 low-frequency ultrasonic electronic: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese DZ-1 low-frequency ultrasonic electronic therapy instrument: Circuit Design, Parts List & Workshop Prototype 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 3015 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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DZ-1 low-frequency ultrasonic electronic therapy instrumentLow-frequency ultrasonic waves are clutter with irregular changes in frequency and amplitude. The simplest way to generate this waveform is to connect a relay KL in series with the collector circuit of the transistor, and connect a normally closed contact KL1-1 controlled by KL in the base circuit, and adjust the spring leaf. To the critical value, the contact resistance generated when KL1-1 is turned on and off changes with the suction force, so that the base current Ib also changes with the suction force, and Ib controls the collector current Ic, and the change of Ic affects Ib through the relay KL, and so on. However, the contact resistance during switching is different every time, so Ib and Ic are also random. This produces low-frequency ultrasonic waves whose frequency and amplitude vary irregularly within a certain range. alt="76.jpg (20819 bytes)">Figure 46-1 …

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