No audio without coil

[Badboydas]

Hi all
Just finishing up a great project thanks carl. Problem is no audio without coil any ideas. Also I`m not entirly sure what auto balance is supposed to do, seems to have no effect in on or off position.
cheers in advance

[Carl-NC]

Auto balance is SAT, which affects target and ground responses so you won't see its effect while idling. If you get audio with a coil, then when you remove the coil the threshold may be too low.

- Carl

[Badboydas]

Thanks for the reply Carl
I understand auto Balance now. Threshold does not make any difference. it might sound strange wanting audio without coil but I figure there must be somthing wrong with the circuit.
cheers

[Carl-NC]

You may want to measure voltages in the analog path with and without the coil to see what might be happening.

[Badboydas]

Carl your a star I`ve omitted R51 probably thinking it was part of non-VCO option (or just a senior moment) I check it out tomorrow.
cheers

[Badboydas]

Carl sorry for taking so long to come back with how it went. R51 made no difference , Any way after going over the board voltages things varied quiet a lot so I started looking for dry joints and shorts nout there then I checked all the pots and found auto balance had no connection to switch 2 through hole plating had no continuity. Once this was soldered along with all the other through hole pads I had audio without the coil (shes a different beauty). Just one more question because switch 2 was not shorted when calibration was made will it need to be calibrated again if so will removing R5, IC8 and IC9 be good to complete the operation.

[Carl-NC]

No, re-calibration should not be needed. SW2 has no effect on the cal procedure.

[Badboydas]

Cheers Carl I appreciate your help