Traditional Chinese Practical Dual-use radio: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Practical Dual-use radio. 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 1460 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 and hearing aid dual-purpose machineFigure 145 shows the circuit of a dual-purpose radio and hearing aid machine. The audio signal output by pin ③ of YSH4 is converted by S and then added to the direct-coupled amplifier composed of VT2 (9014) and VT3 (3AX31) through C6, volume potentiometer RP and C7 for amplification, and is output by the VT3 emitter.Figure 145When S is placed in the hearing aid position, the audio current picked up by the microphone BP is amplified by VT1 (9014) and added to C6, and then added to the base of VT1 through RP and C7, and is played back by the headphones. It can be seen from the figure that when S is set to the hearing aid, pin ③ of YSH4 stops working due to no DC voltage. This prevents radio interference from interfering with hearing aids.L in the picture is magnetic wireless. The magnetic rod is a flat magnetic rod with a length of 55mm. The antenna coil is densely wound 75 times on a self-made frame with Φ0.31mm enameled wire. S uses a 2×2 type toggle switch, BP uses a small electret microphone, …
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