DZ-2 Low-frequency Ultrasonic Electronic: Traditional Chinese Circuit
In short: Traditional Chinese DZ-2 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 2171 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
DZ-2 low-frequency ultrasonic electronic therapy instrumentThe design principle of the DZ-2 therapeutic device is similar to that of the DZ-1 therapeutic device. It also generates low-frequency ultrasonic waves with irregular changes in frequency and amplitude within a certain range.The block diagram of the DZ-2 therapeutic instrument is shown in Figure 47-1. It consists of a low-frequency ultrasonic generator, an emitter follower, an output controller, a power amplifier, a modulator and a power supply. It can be divided into three outputs (for electroacupuncture) or a single output (for treatment). alt="78.jpg (41014 bytes)">Figure 47-1The circuit principle of the DZ-2 therapeutic device is shown in Figure 47-2. The working process of low-frequency ultrasonic generator, power amplifier and output adjustment is the same as that of DZ-1 type. The difference is that a first-level emitter follower is added between the low-frequency ultrasonic signal generator and the power amplifier to improve the load capacity and provide three outputs. The modulator is an astable multivibrator composed of transistors VT12 and VT13, and is output by the collector of VT13. One channel directly outputs a rectangular wave, and the other channel is modulated by VT14 and VT15 emitter followers to form fluctuation waves. S1A and S1B are linked. When S1 is in the "1" position, the whole machine is disconnected and does not work; when S1 is in the "2" position, the power is turned on, and continuous ultrasonic waves are directly output without modulation; when S1 is in the "3" position, the ultrasonic rectangular wave modulation is output intermittently; when S1 is in the "4" position, it is fluctuation wave modulation, and the modulation frequency is between 12 and 42 times/min, adjusted by RP4. VT1, VT2, VT4, VT7, and VT10 are all 3AX31 type tubes; VT3, VT5, and VT9 are all 3AX63 type tubes; VT6, VT8, VT11~VT15 are all 3AX81 type tubes.The therapeutic effect of this therapeutic device is basically the same as that of the DZ-1 therapeutic device, but the treatment range and applicable occasions are better than that of the DZ-1 therapeutic device. …
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