pstamler
Well-known member
Hi folks:
I'm in the process of designing a power supply board, which I'll offer on the Black Market in due course, as well as writing it up for whichever magazine wants to accept it. It'll be an attempt at a semi-universal board for low-voltage low-to-medium current circuits -- in other words, preamps, line amps, compressors; the kind of stuff we all mess with when we're playing with solid state. Typically it'd have +/- something or other, up to maybe 36 volts, plus a single separate circuit -- you could use for 5V logic supply, or 48V phantom supply. Not a super world-beating circuit like the Jung regulator, but way better than bog-standard, and very versatile. (You could even use the regulators as pre-regs for something like the Sulzer or Jung supply.) I've taken a lot of care to keep RF crud (from diode switching) out of the outputs.
Here's my question. I'm building the board with everything on it except the transformers -- two-stage raw supply, three regulators of the LM317/337 or (in the case of two of them) TL783 class. (You could use LT1085s for the positive regs if you wanted.) There will be a cut line down the middle of the board, between the first filter cap bank and the second stage of the filter, so you can mount the first part with the xformers in a remote supply box, with the second-stage filter and the regs in the box with the audio circuits. But there are two ways to do this.
My board, as it's developing, is 3" wide and 9" long; it can be sliced, if the user wishes, into pieces 3 x 4" (raw supply) and 3 x 5" (second stage and regs). It's nice and elegant-looking -- but is a 3 x 9" board ridiculously large? Would I be better putting the two halves side-by-side rather than nose-to-tail, to create a 6 x 5" board (still sliceable, but a 5" slice rather than a 3")? Or will almost everyone slice it in half anyway, so it won't matter?
To clarify (with small files), here's the long version:
and the wide one:
I confess I like the idea of the long one for several reasons, most important of those being that I've already laid out almost all of the parts for it! But also because the jumpers, in the unsliced version, are nice and short, and the regulators / outputs aren't sitting right next to the diodes and AC input.
Peace,
Paul
I'm in the process of designing a power supply board, which I'll offer on the Black Market in due course, as well as writing it up for whichever magazine wants to accept it. It'll be an attempt at a semi-universal board for low-voltage low-to-medium current circuits -- in other words, preamps, line amps, compressors; the kind of stuff we all mess with when we're playing with solid state. Typically it'd have +/- something or other, up to maybe 36 volts, plus a single separate circuit -- you could use for 5V logic supply, or 48V phantom supply. Not a super world-beating circuit like the Jung regulator, but way better than bog-standard, and very versatile. (You could even use the regulators as pre-regs for something like the Sulzer or Jung supply.) I've taken a lot of care to keep RF crud (from diode switching) out of the outputs.
Here's my question. I'm building the board with everything on it except the transformers -- two-stage raw supply, three regulators of the LM317/337 or (in the case of two of them) TL783 class. (You could use LT1085s for the positive regs if you wanted.) There will be a cut line down the middle of the board, between the first filter cap bank and the second stage of the filter, so you can mount the first part with the xformers in a remote supply box, with the second-stage filter and the regs in the box with the audio circuits. But there are two ways to do this.
My board, as it's developing, is 3" wide and 9" long; it can be sliced, if the user wishes, into pieces 3 x 4" (raw supply) and 3 x 5" (second stage and regs). It's nice and elegant-looking -- but is a 3 x 9" board ridiculously large? Would I be better putting the two halves side-by-side rather than nose-to-tail, to create a 6 x 5" board (still sliceable, but a 5" slice rather than a 3")? Or will almost everyone slice it in half anyway, so it won't matter?
To clarify (with small files), here's the long version:
and the wide one:
I confess I like the idea of the long one for several reasons, most important of those being that I've already laid out almost all of the parts for it! But also because the jumpers, in the unsliced version, are nice and short, and the regulators / outputs aren't sitting right next to the diodes and AC input.
Peace,
Paul
