Description
Product name: DIY electronic production welding kit for hearing aids
Product model: TJ-56-20
Working voltage: DC3V
PCB size: 39 * 25mm
Description:
The hearing aid consists of microphone, front low amplifier, power amplifier circuit and earphone. This kit is an ideal training kit for learning analog circuits.
Circuit principle:
The electret microphone BM acts as a transducer, which can convert the acoustic signal into the corresponding electrical signal, and send it to the front low amplifier for amplification through the coupling capacitor C1. R1 is the bias resistance of the electret microphone BM, which provides the bias voltage for the normal operation of the microphone.
VT1, R2, R3 and other components form a pre-low frequency amplification circuit to pre-amplify the audio signal coupled by C1. The amplified audio signal is added to the potentiometer RP through R4 and C2, which is used to adjust the volume. VT2 and VT3 groups of success rate amplification circuits amplify the audio signal and push the headset to work through the headset jack.
Package Included:
Circuit diagram:
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