Then the FET's gate is floating, isn't it?I just build this circuit using fetless electret, bfw10 fet, bc327-40, omitting Rg
Do you mean omitted or shorted?and R1,
Is it? I don't see much difference between the actual circuit in post #1 and the one I had simmed earlier.You changed the schem considerably since first posting it
Then, how do you explain it works? You know the FET's gate needs to be galvanically connected. If not, the operating point is not stable, ending with the circuit locking.Yes, the gate of the fet is floating.
Is it stable? If yes, how do you explain it?Voltage at the Source of the fet is around 13V
I was suggesting that the original post was edited at some point, and the schematic replaced with a different one.Is it? I don't see much difference between the actual circuit in post #1 and the one I had simmed earlier.
Are you sure you understand how this works? Don't mean no bash what you wrote here, but i'm not sure you got this part right.Whenever you use electret capsules make sure whether the buildtin pol. voltage is positive or negative.
My comment: very interestingComments welcome![]()
Oops, I am pretty sure, pls see this threat post #37
https://groupdiy.com/threads/can-an...scott-dorsey-akg-c-3000-mod.23481/post-280984
The AKG developers know what they say
It is also my own experience that an additional polarization voltage changes electret capsule sensivity. Tried it with EM21 / EM23 Primo capsules, they benefit from the additional positive pol. voltage (4..5 dB more signal @ +40V pol. voltage)
Another well known guy (Siegfried Linkwitz) explained why -9V on a cheap electret capsule has the desired effect on output voltage
Comments welcome![]()
Linkwitz's circuits don't apply -9v to the electret, but to the FET built into the capsules.Oops, I am pretty sure, pls see this threat post #37
https://groupdiy.com/threads/can-an...scott-dorsey-akg-c-3000-mod.23481/post-280984
The AKG developers know what they say
It is also my own experience that an additional polarization voltage changes electret capsule sensivity. Tried it with EM21 / EM23 Primo capsules, they benefit from the additional positive pol. voltage (4..5 dB more signal @ +40V pol. voltage)
Another well known guy (Siegfried Linkwitz) explained why -9V on a cheap electret capsule has the desired effect on output voltage
Comments welcome![]()
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