Hi Jiim
Greetings to you from Kuala Lumpur. I have been somewhat busy...so have not had much time for all my hobbies and projects
!
Anyhows.... i had been busy making sense of your ground regen thingie mod drawing. And so i ordered the bits from Farnell and started scratching my head how to plant them into the board neatly.
Your drawing was clear enough it seems mate
. I managed to build it. Yay! I hooked it all up and i am glad to say that i there were no bad smells and sounds. Phew
!
The Traco seems to draw just under half an ampere when fed 12 ish volts. In turn it puts out just a whisker under 30V. So all is well there!
Checking the rail balance showed that the 0V was no where near where it should be. I can see why you say 1K5 "ish" in your drawing Jiim.
I was measuring 17V on one rail and -13V on the other. It was somewhat of a pain in the bum to be pulling out the "regenie", and so i thought i would work it out empirically.
Pulled out my bag of resistors and started some poke and see. What i reasoned out was that i should try some high ohmage resistors in parallel with your / my 1K5. Slowly slowly... i managed to bring that 17V down to nearly smack on 15V. I found that the magic value to add in parallel with the 1K5 for my preamp was 10K. There is probably 0.1 or 0.2 V difference now between rails
Checking all the regulators shows a voltage spread from 11.4 to 11.7V.
Now i am starting to work out how to case it into my 42......
Question for you Jiim.... Not sure how to word it...
Can we hook up the Traco to the Naims 4 pin din socket and get the power fed from a Snaic 4?
The reason i ask is..... sure, our wide band Traco will support the 24V from a standard Naim power supply or lower end power amp.... But will be compromising our optimised starfish earthing by connecting the traco's earth input pin to our preamps signal out earth at the signal out socket ?
Do you know what i am getting at?
Elsewise...here is a nice closeup shot of the power supply arrangement. A big thanks to you two, Jiim and Hacker. You guys left a good trail of info for the seekers to dig out.....
Cheers
mark