shortwave radio receiver circuit project

All coils are designed using an inch diameter pvc pipe using 20 gauge insulated hookup wire, L1 require 6 turns and L2 require 14 turns. You can add turns to or subtract turns from L(or change C2) to receive other frequencies. Q2 and Q3 form an amplifier, which has sufficient output level to directly drive headphones or a small speaker, amplify

the detected audio signal output from D1. R3 can replaced with a 2kohms potentiometer, if you want to use it as an volume control. R4 and C4 form a lowpass filter that maintains circuit stability and improves the receiver`s sound quality. D2, D3, and D4 implement a low-cost voltage regulator to keep the voltage supplying Q1fairly constant, which minimizes drift.

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