Low cost AM radio
Description.
Here is the circuit diagram of a simple and low cost AM radio. The working of this radio circuit is straight forward. Inductor L1 and capacitor C1 forms the necessary tank circuit. Diode D1 performs the job of de-modulation. Transistor T1 is wired as a preamplifier whose output is further amplified by the IC LM386 to drive the head phone Z1. The 10K POT R3 can be used as a volume controller.
Circuit diagram.
Notes.
- The circuit can be powered from a 9V PP3 battery.
- Use a 100cm long metal wire as antenna.
- Experiment with the value of L1 for catching other bands.
- The circuit can be assembled on a Vero board.
You may also like:
Custom Search
printing error:220uH not 220uf
Hi Gustav D1 C2 acts as a De-modulator for RF and C3 is for coupling the audio signal to base of Q1 (you can also call it as DC blocking for base bias of Q1)
CIRCUS= CIRCUITS Sorry for the Misteaks!!
I LIKE RADIO CIRCUS!!
What’s the purpose f C2 and C3?
Hi Dedi No it has to be germanium point contact so that it can detect very low level signal also, its junction capacitance also will be low, the requirement. you can try OA95, OA85, IN34A OA70, OA79 etc.
can i change D1 (AA119) with IN4001 or IN 4002 ?
@ Mubarak
Try this link – http://www.circuitstoday.com/how-to-make-an-air-core-inductor
can this circuit drive an ordinary speaker?.
which type of inductor can be used in this circuit?. can i make an air core inductor or ferrite. please specify the number of turns for the coil also.
can you specify how much turns are required to make 220 uh inductor on ferrite ??