Traditional Chinese Practical Multifunctional distress caller: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Multifunctional distress caller: 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 2443 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Multifunctional callerThe multi-functional rescue device has multiple functions such as calling for help, lighting, hearing aid, doorbell, voice-controlled lantern rhythm, etc. Its size is like a pocket radio, so it is easy to carry.How it works:The principle is shown in Figure 146. The whole machine is composed of a rescue alarm signal generating circuit, an audio power amplifier circuit, a voice-controlled lantern metronome and a transfer switch.Figure 146When the power switch S1 is turned on, the transfer switch S2 is set to position 2, and S3 is set to position 1? and 5?, the machine is in a call for help alarm state. The call for help alarm signal generator composed of IC1 music integrated circuit KD9561 is triggered and turned on. …
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