Traditional Chinese Practical Dual Timed Responders: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Dual Timed Responders. 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 2454 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Dual timer answering machineThis circuit uses small thyristor components as the core component of the preemption, which can increase the number of preemption groups almost unlimitedly, because it does not involve adding lines on the circuit board in the host control box. In addition, the thyristor circuit can have a higher voltage and a more eye-catching signal light, which is conducive to direct identification and supervision by the audience.Figure 142The principle circuit of the whole machine is shown in Figure 142. The dotted box in the upper right corner of the picture represents the operation box placed in each competition team.Now assume that the first group presses the answer button first, that is, SB01 is pressed and closed. …
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