2n3565

[Hercan Robotics]

Ok I hooked it up that way and it does the same thing. Maybe I could send better pictures?

 

[opamp741]

i like to know why diode 1n34 is used in op amp radio

 

[audioguru]

We are not talking about an opamp radio here. We are talking about the Lie Detector circuit from Aaron's site.

You should start your own topic.
The opamp radio which is also from Aaron's site?
I don't think it works:
1) The opamp has its pin 3 grounded. It should be biased at half the supply voltage, then its output will be able to produce the AC of audio.
2) The AM detector diode doesn't have a DC load and doesn't have a filter capacitor.
3) The tuned circuit is loaded down by the very low input impedance of the inverting input of the opamp. The input to the opamp should be to its non-inverting input which has a high impedance so the tuned circuit will have higher selectivity.

 

[Marks256]

Don't you just love random posts? Oh, wait a minute...