Direct Coupled Radio

admin February 22, 2011 1 Comment

Direct Coupled Radio Circuit

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.

Radio Circuit Diagram with Parts List

Radio Circuit Diagram

Radio Circuit Diagram

Notes

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:

1. AM Receiver Circuit

2. FM Radio Jammer

3. Mini FM Transmitter

4. Single Chip FM Radio Circuit

5. Aircraft Radio

Comments
  • Jonathan
    January 29, 2011

    Most people haven’t even heard of HEP transistors. Can you provide subs for the beginners? Also, even tho this an admirably simple circuit, it could use a little improvement, as well as a better layout. Who the heck has 2 to 5k Headphones? Should be adapted for 32 ohmers.

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