When you say the greater the swing, do you mean greater gain and/or
maximum output? This is normal and intended.
😎
maximum output? This is normal and intended.
😎
Sorry, I mean oscillation not swing.
When I turn the P2 < ca.3k (R18 + P2 < 4,5k) the F3 start to oscillate.
When I turn the P2 < ca.3k (R18 + P2 < 4,5k) the F3 start to oscillate.
I tried a Capacitor between the B and C of the NPN-transistor in the CCS.
With out this C it oscillates at about 200 kHz and with 1nF at 25 kHz (Aleph CCS at 50%).
With 4,7nF the F3 is completely stabile no meter where the P2 stay.
But the bandwidth gets down.
I think I make a new Layout like Peter Daniel.
Can I change the values of the Feedback Resistors 9k to 6,19k and 47k to 31,6k to increase a little bit the bandwidth with out Problems? I think my pre amp will do this (200Ohm output impedance).
With the Aleph CCS at about 10% (no oscillation) it sounds very good. I hope I can hear the F3 with 50% Aleph as soon as possible.
With out this C it oscillates at about 200 kHz and with 1nF at 25 kHz (Aleph CCS at 50%).
With 4,7nF the F3 is completely stabile no meter where the P2 stay.
But the bandwidth gets down.
I think I make a new Layout like Peter Daniel.
Can I change the values of the Feedback Resistors 9k to 6,19k and 47k to 31,6k to increase a little bit the bandwidth with out Problems? I think my pre amp will do this (200Ohm output impedance).
With the Aleph CCS at about 10% (no oscillation) it sounds very good. I hope I can hear the F3 with 50% Aleph as soon as possible.
I see that your C19 at .1uf is lower than the 10uf in ZV9. Perhaps
you should try the higher value.
Alternatively try a CE cap instead of a CB cap.
😎
you should try the higher value.
Alternatively try a CE cap instead of a CB cap.
😎
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