Carl's M.F.D.

Hi Carl,

I think the frequency for gold (5 Khz) is OK. But the silver's frequency (7.8 Khz)...? In this frequency no work for silver. In other M.F.D.'s model the frequency is 8.7 Khz. Also the low-pass filter (R4-C3) need correction, if the silver's frequency is 8.7 Khz (actual frequency of the filter = 8.5 kHz). What's values I need, for example, to achieve 9.5 Khz for the filter?
A person found gold coins with your M.F.D. (I think in Germany). Also, this person wrote (read in LRL's forum, old message) that your frequency for silver is not the correct.
I think that your frequency for silver is really for aluminium!!!

Thanks in advance

Esteban