Traditional Chinese Radio, hearing aid, lighting three-purpose machine (Workshop Practice) — Circuit, Wiring & Debug Guide
In short: Traditional Chinese Radio, hearing aid, lighting three-purpose machine (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 2010 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Radio, hearing aid, lighting three-purpose machineThe circuit is shown in Figure 108. When the jack "When the hearing aid circuit is working, the microphone BP converts the weak sound signal incoming from the outside into the corresponding electrical signal. After multi-level amplification by IC2, the amplified sound is finally restored from the earplug machine; when the earplug machine is unplugged, it becomes a small flashlight. Press the self-reset switch SB, and the self-concentrating small electric bead H will shine.Figure 108R1 in the figure is the IC1 bias resistor, R2 is the automatic gain control (AGC) and load resistor; R4 and R6 …
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