Direct Coupled Radio
Description
Here is the circuit of an excellent direct coupled radio ideal for listening to near by stations.The circuit uses Q1 as a diode detector and first audio amplifier.The detection is across the first emitter base junction which operates as a diode.The base emitter capacitance provides the radio filtering.The resistor R1 is adjusted to obtain the least distortion with consistent volume.Transistors Q2 and Q3 also serve as audio amplifiers.
Circuit Diagram with Parts List
Notes
For L1 use a center tapped ferrite antenna coil used AM receivers.
Battwry is advised to power the circuit to reduce noise.
