Ivconic Fisher Gold Bug

[Andre]

If you added a 3.9k resistor from the inverting inputs to what they are calling VDD on the original schematic then you would have a buffer with a gain of 1 with less noise and the offset pots would be much easier to adjust.

I can try this!
Thanks!

[Andre]

If you added a 3.9k resistor from the inverting inputs to what they are calling VDD on the original schematic then you would have a buffer with a gain of 1 with less noise and the offset pots would be much easier to adjust.

DavidB,

There was no significant change in the adjusts, but I left the resistors there.

[jeep6789]

Can anyone explain the specific working principles of 4013 and 4053? Thank you

[Op04]

Can anyone explain the specific working principles of 4013 and 4053? Thank you

I try to figured out. Please correct me if I'm wrong, just want to keep this thread alive,, so the frequency that send to 4013 will do flip-flop (one part goes to tx another one to demodulator) as well as divided half in the same waveform (74.21 : 2 ) : 2 = 18.55khz while the 4053 is powered ON by the pulse carry from 4013 and switch ON signal from the receiver and goes to bandpass filter

[Andre]

I try to figured out. Please correct me if I'm wrong, just want to keep this thread alive,, so the frequency that send to 4013 will do flip-flop (one part goes to tx another one to demodulator) as well as divided half in the same waveform (74.21 : 2 ) : 2 = 18.55khz while the 4053 is powered ON by the pulse carry from 4013 and switch ON signal from the receiver and goes to bandpass filter

You are right!!!!!

[Andre]

Dear friends,

I got back to work on the Fisher Gold Bug I project perfectly adapted by our dear Ivconic. I got great results, but as with the original Fisher design, there is no iron discrimination step as there is in the Gold Bug II. Does anyone have any idea how a discrimination stage could be added to the circuit, which I leave attached to the post?

[Op04]

Dear Andre, glad to see this progress. Just looking that schematic similar to sascho PID here's drawing from master Ivconic, try if that work.

[Andre]

Dear OP04!!!!!!
Thank you!
I'll try to make it work! I'll post the results!

[Op04]

Dear OP04!!!!!!
Thank you!
I'll try to make it work! I'll post the results!

Dear Andre,, You're welcome! So exciting to see the result!!