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HH is working fine with both vco and non vco options. I noticed that VCO option audio frequency also changed when I was altering main freq and pulse width.
For non VCO option I have folowing parts : Q10, R49, R50, R51 and jumper from IC9 pin7 to Q11 base. No IC9 installed. It works like described - only changes in loudness.
For VCO I have also Q10, R49, R50, R51 installed but no jumper and IC9 is installed. It works like this: Without target it is kindof ticking (pretty uggly) and with target close to coil sudden high pitch depending on main clock. Its works but I expected steady rise in freq.
But I wanted that audio freq ins independed so I removed Q10 and R51. But I got following -when I move target closer to the coil it starts beeping, but when moving it more closer by few cm, sound stops. So its beeping only when object is far from the coil. when I moving target closer it stops. LIke something is saturating somewhere.
So whats could be problem?
For non VCO option I have folowing parts : Q10, R49, R50, R51 and jumper from IC9 pin7 to Q11 base. No IC9 installed. It works like described - only changes in loudness.
For VCO I have also Q10, R49, R50, R51 installed but no jumper and IC9 is installed. It works like this: Without target it is kindof ticking (pretty uggly) and with target close to coil sudden high pitch depending on main clock. Its works but I expected steady rise in freq.
But I wanted that audio freq ins independed so I removed Q10 and R51. But I got following -when I move target closer to the coil it starts beeping, but when moving it more closer by few cm, sound stops. So its beeping only when object is far from the coil. when I moving target closer it stops. LIke something is saturating somewhere.
So whats could be problem?