BA-3 As Preamp

[tinitus]

ah, ok, output cap is gone

 

[generg]

Hi Buzz what Kind of Feedback are you using?

 

[buzzforb]

Funny kind.

 

[generg]

So you have secrets......

 

[buzzforb]

First step is your circuit. Second is slightly altered version. Third centers around output bias and losing any in line caps. Fourth is funny bias on output. May not get eny of it to work

 

[generg]

Thanks!

Good luck!

 

[Zen Mod]

buzz

don't forget to try McMilan's

say 10K for starters

 

[buzzforb]

I have never found info on this reference. I know the person, but kind find the circuit or description.

 

[Zen Mod]

look in later (latest) Aleph X incarnations

Eric's site is good place for A.X info

 

[buzzforb]

Will do. Here is irritating version of cant see forrest for the trees. Tell me why this i snot working. On Semi Mur860 as rectifiers. Everything else is self explanitory. Toshiba fets as mulitplers. Diodes are getting hot.

 

[buzzforb]

buzz

don't forget to try McMilan's

say 10K for starters

As drawn in AX info on Eric's wonderfully done site, will these not be in parallel to current funny feedback.

 

[Zen Mod]

first - Toshibas as multipliers ( more followers , to me ) is waste

second 0 you jnow that I have fobia of looking at pcbs and tracing them , but I can't see anything wrong

you didn't misplaced mosfet's place ?

N on positive , P on negative ?

what's programmed current through Zdiodes ?

say that 5mA is more than enough

 

[Zen Mod]

As drawn in AX info on Eric's wonderfully done site, will these not be in parallel to current funny feedback.

think

moi also found simple way for ditching C-based level shifters for balanced version , but will not reveal that - waiting for clicketeclick in your scull*

*just joking - will not do that because I feel on thin ice there , regarding Papa's IP

 

[buzzforb]

24 sceondaries should yeild 34 rails with this such small current draw. THe diodes are 9.1V and beefy part #4739, 4.7K should yield 7mA, TOshibas are definite waste, but what I had. Pinout is GDS. It should work. Only inner rectdiodes are getting hot. Makes absolutely no sense. IT is PSU from Zen line stage article. BAsic cap mulitplier.

 

[buzzforb]

think

moi also found simple way for ditching C-based level shifters for balanced version , but will not reveal that - waiting for clicketeclick in your scull*

*just joking - will not do that because I feel on thin ice there , regarding Papa's IP

Got some ideas on this but will take time to flesh out. Just trying to see how stable basic circuit is.

BTW,
In aboce setup of PSU, I do not have ground tied to earth, but that shouldnt matter, correct/

 

[Zen Mod]

ditch zenners , up cap value and you have cap multiplier

with zenners , that's nothing else than series reg , sometimes called zenner follower or something like that

earth -gnd - doesn't matter for circuit function

(pretty lousy gnd layout on that pcb )

 

[buzzforb]

It should be solid plane consuming all connecting points?

 

[Zen Mod]

nope

it should be Lonesome Star , centering output gnd point

 

[flg]

 

[Zen Mod]

that was fast edit