I figured the thread title is like waving a red flag - Many thanks for your attention.
The SIT-3 circuit you posted in the past shows a jfet pair input. I think this is limited to ~30V or so? The sweetspot of the 2SK180 is more like 35V I think and then you going to lose a bit across the CCS. So how best to change this circuit for the different optimal rail voltage?
thanks Mike
The SIT-3 circuit you posted in the past shows a jfet pair input. I think this is limited to ~30V or so? The sweetspot of the 2SK180 is more like 35V I think and then you going to lose a bit across the CCS. So how best to change this circuit for the different optimal rail voltage?
thanks Mike
Wow. Interesting circuit.
Single ended power supply.
You could probably go to 50V but that will only give 25V across your Sit.
You would need to cascode input stage to go higher.
How critical is 35 Vds for 2sk180 when used as a follower?
Single ended power supply.
You could probably go to 50V but that will only give 25V across your Sit.
You would need to cascode input stage to go higher.
How critical is 35 Vds for 2sk180 when used as a follower?
The Vds and Ids you select depends on the performance you want from the SIT
and the load impedance. SIT-1 transistors like something resembling 15 volts
and 1.5 amps with an 8 ohm load. Not a lot of point having a 50V rail for the
part in that circuit, but you can do it, the extra dissipation goes to the current
source.
Other parts and loads, YMMV.
and the load impedance. SIT-1 transistors like something resembling 15 volts
and 1.5 amps with an 8 ohm load. Not a lot of point having a 50V rail for the
part in that circuit, but you can do it, the extra dissipation goes to the current
source.
Other parts and loads, YMMV.
If I were to have a B1 Korg front end and couple it with an input capacitor, could I drive the transformer directly and remove the two input JFets.... the concern over rail voltage across the input pair would go away.
I am way out of my depth here.
I am way out of my depth here.
Korgie is , at least as I'm understanding Papa's article , too sissy in swing department
happy up to 1V ....... though , for a moment I'm puzzled - is that for RMS or p-p ?
I'm always thinking in p-p terms , but I presume graphs are all for RMS figures
happy up to 1V ....... though , for a moment I'm puzzled - is that for RMS or p-p ?
I'm always thinking in p-p terms , but I presume graphs are all for RMS figures
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First, how important is it for you to have 35Vds for 2sk180?
Surely it is not too bad at 20Vds.
Remember this is source follower operation.
Surely it is not too bad at 20Vds.
Remember this is source follower operation.
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Use j103 k246 instead - theyve a higher voltage rating and should still be fine as a buffer.
Many thanks - that's very kind,
I need to understand more before I go do something. Hoping to pick up some knowledge via diffusion at BAF
😱)
I need to understand more before I go do something. Hoping to pick up some knowledge via diffusion at BAF
😱)
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