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Wow, this is perfect - thank you Brad! I understand how all the basic components work, it's just hard to know how to tie them together in interesting ways. I guess this will come from experience.
Thanks again!
To be even more clear, I measured a swing of 4.2V to about 4.4V coming out of the amplifier stage, just before the audio signal hits the coupling capacitor to the speaker. This seems like the best place to tap in a signal strength LED because there's plenty of voltage. There is only ~1.3V -...
Yes, after the detector and just after the amplifier (class B dual transistor). I used my volt meter to watch the change in voltage as I played with the tuning dial. I know it's not exact, but it was in the range of a couple hundred mV as the signal changed.
I've built a first, small AM radio and I'm just getting into electronics. I'd like to add a station strength indicator LED. The voltage exiting the amplifier stage varies by a small amount, 100 or 200 mV, based on signal. How can I amplify that swing such that the LED will vary output in a...
Sorry for a probably basic question, I'm just getting into electronics. I'm learning as I go, but don't really know how to debug many problems.
I'm building the old Ladybird crystal set, as seen here:
**broken link removed**
I've replaced the OC71 transistor with an NTE 102A.
You build the...
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