Thanks Juma,
No i intend to use your PSU.
With pre regulator isolated from cap multiplier, this will be in same pcb as preamp and buffer...it seems JC also likes this arrangement.
This is just because the box I've got is from an old Granger aeronautical transmitter...very small and compact, cast alu with internal division in the center....just right i think.
I'll post pictures when done. 😎
No i intend to use your PSU.
With pre regulator isolated from cap multiplier, this will be in same pcb as preamp and buffer...it seems JC also likes this arrangement.
This is just because the box I've got is from an old Granger aeronautical transmitter...very small and compact, cast alu with internal division in the center....just right i think.
I'll post pictures when done. 😎
Here is an SMd version I am goign to have made. I have chosen to do the rectification section differently, as I will use a different transformer with dual windings. Want to try full dual mono as this is DIY and excess is the nature of the game. Super low noise stage should use low noise smd and susumu RG will be my choice.
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I have read that a pot at the output was suggested by Nelson at BAF. My question is whether or not we should follow it with another buffer?
Be careful with it:
1. have in mind that pot's total resistance will be in parallel connection with the resistor that sets the gain.
2.Your preamp will always work in full throttle mode so louder recordings or high level source component will drive it into clipping and you won't be able to do anything about it with the pot at the preamp's output...
3. buffer becomes mandatory after the pot since the 10k pot will (in worst case - at middle resistance position) represent 2.5k series resistance to the next stage (power amp)
I would have assume a pot at the input, only asked because someone had commented as such in this thread.
Nelson did suggest a pot on the output - I remember as it was I who asked. I think it's on the video...
The pot on the output has the advantage of attenuating the circuit noise as well - cool!
I like Juma's ideas, especially with the BJT on the output, and the buffer.
The pot on the output has the advantage of attenuating the circuit noise as well - cool!
I like Juma's ideas, especially with the BJT on the output, and the buffer.
Yeah, I got a "different" version already in the works, but didnt know if this was interesting. Transformers gives excellent DC isolation, allowing us to drop the cap. Told ya I was on a transformer kick😀
by different, do you mean different use of transformer.
by different, do you mean different use of transformer.
no , I meant - make that dual LSK as integral (bridged , balanced , whatever you call it ) stage , having all virtues of bal to se and se to bal conversion , amongst other things
then you don't need xformer at all
then you don't need xformer at all
No. I was thinking of the hum generg hears with his build of the SIT amp from BAF 2013;which does not use a regulated power supply.