I am new to electronics and radio, but I have managed to create a basic receiver which looks like the attached circuit. The main radio part is all on a breadboard, the LM386 is on a breakout board soldered together with 3 header pins to attach with jump wires to the radio receiver.
When I attach my aerial (several feet of wire) I can pick up stations quite loudly and all is good. However, there are some things which confuse me, and I am hoping someone might be able to explain.
Any light that anyone can shed on these questions I'd be grateful. It's confusing me a bit..
When I attach my aerial (several feet of wire) I can pick up stations quite loudly and all is good. However, there are some things which confuse me, and I am hoping someone might be able to explain.
- How can I remove the low hum in my circuit? It disappears when I touch the metal handle of the potentiometer volume control
- If I remove the lead connecting the output from the transistor to the LM386 breakout board, and just hold it by the insulated part (not the end), not only can I still hear the radio station, but I can hear it LOUDER. How is this possible?!
- If I remove the coil, I can pick up Romanian English language radio. But only that station. Again, how is this possible since the oscillator is gone? Is it just reacting with the overall impedance of the circuit?
Any light that anyone can shed on these questions I'd be grateful. It's confusing me a bit..
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