HecaWorld One transistor FM Receiver.3GP

One Transistor FM Receiver.

As promised in our One-Transistor FM transmitter video, we adapted our One-Transistor FM transmitter into a One-Transistor FM receiver. Many times I had noticed that when I place my home made FM transmitter near an FM radio receiver and tune the inductor or variable capacitor of my transmitter, I was able to 'bring in different stations into the FM receiver'. I had wondered what kind of interference this might be and also wondered if I could as a matter of fact, use this transmitter as in receiver with slight modification.

I did not pursue that idea because my team, Itumaful, St. Udu, Prince Collins, St. Chijioke and Spako, figured out a way to use other integrated circuits to build the FM receiver for our projects. It was not until last week that I saw this video by decod31 (credit to him for posting the video and all his tips) that I decided to resurrect my passion for a simple FM receiver....and a few hours later....here we are with a decent low power, low cost FM receiver.

Here we used a general purpose NPN transistor to build this simple FM Receiver. All other parts are from old electronics junks. The core of this circuit is the FM transmitter, there is only one more addition which is the 3pF capacitor acting as the receiving antenna.

Our target was to use minimum voltage supply, we tried a single 1.5V AAA battery but the audio signal output was very low, so we upgraded to 3V (2 X 1.5V AAA batteries) and it gives a decent audio output.

Please, post your comments.