Direct Coupled Radio Circuit
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.
Radio Circuit Diagram with Parts List
For L1 use a center tapped ferrite antenna coil used AM receivers.
Battery is advised to power the circuit to reduce noise.
We have more Radio Circuits that you may like to read and understand;Given below: