That does not look like a very good circuit. Where did you get it from?Yes, it is a lot more complex than Bertus pics but thanx anyway.
I have a good feeling that i found the capacitor i was looking for and now I am trying to apply it to the AM radio circuit i made but (again) it doesnt work...
No, according to me a simple TRF radio could be made with one transistor. Greater gain can be obtained with more transistors, but quite good earphone results can be obtained with just one, especially if a "reflex" circuit is used so that the transistor amplifies first at radio frequencies, then following a diode demodulator the same transistor amplifies the audio. I built many simple radio circuits when I was a schoolboy, over forty years ago.No, i havent but according to you there must be a lot of stages in an AM amplifier. Then how all these schematics on the net do this particular job with 2-3 transistors?
I decided to leave my idea, for the moment, and use a tested solution, like this http://www.diy-electronic-projects.com/projects/78/2sradio.jpg But still nothing. I am using 2n3904 transistors and all I get are high pitch annoying sounds.
I note that there is no capacitor shown across the power supply: there should be one, physically close to the resistor that was originally 330Ω. 0.1μF should do.I replaced the 330 ohm resistor with a 2.2K potentiometer and no matter what I do high pitch annoying sounds is all i get.
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by Jake Hertz
by Luke James
by Luke James