Request for schematic
I was wondering if Terry or anyone else had a schematic for a suitable PS for this beast.
I was thinking Kari's looked good, but I can't find the schematic, and I don't want to muck it up.
If someone has one that would be great, otherwise, well I will improvise.
Cheers!
Russ
I was wondering if Terry or anyone else had a schematic for a suitable PS for this beast.
I was thinking Kari's looked good, but I can't find the schematic, and I don't want to muck it up.If someone has one that would be great, otherwise, well I will improvise.
Cheers!
Russ
Russ,
I've built two different power supplies for my preamp. The one I'm attaching here is the one I preferred overall, but the differences were pretty minor.
One note, the zener diodes indicated on the schematic represent a series stack of zeners adding up to the indicated values. It isn't necessary to hit those exact values, +/- a few tenths of a volt on either side are fine.
Also keep in mind that I was going for a full-on, no-holds barred approach to this powersupply. If space on the board is a problem, reduce the CRC pi filter down to a single capacitor per rail.
I've built two different power supplies for my preamp. The one I'm attaching here is the one I preferred overall, but the differences were pretty minor.
One note, the zener diodes indicated on the schematic represent a series stack of zeners adding up to the indicated values. It isn't necessary to hit those exact values, +/- a few tenths of a volt on either side are fine.
Also keep in mind that I was going for a full-on, no-holds barred approach to this powersupply. If space on the board is a problem, reduce the CRC pi filter down to a single capacitor per rail.
Attachments
One question answered
Looking at the power supply, it is clear why those coupling caps are needed. I thought the dual rails were at the same voltage.
Dummy question on power transformers. Guess the dual secondaries are used so that one side each is used per channel. So is it two dual secondary transformers or is it four?
George
Looking at the power supply, it is clear why those coupling caps are needed. I thought the dual rails were at the same voltage.
Dummy question on power transformers. Guess the dual secondaries are used so that one side each is used per channel. So is it two dual secondary transformers or is it four?
George
Re: One question answered
Actually looks like its 3. You need 60VAC for the pos rail, so that's a single xformer (using both 30vac secondaries in series), 2 for stereo supplies. You need -15vac for the negative rail, so that's a single xformer (using a single secondary for each channel) for 2 stereo supplies.
Actually, the negative rails are reported at -9vdc as per kari's boards and these supplies give -20vdc. Never really understood the variation in negative supplies but there you have it.
Panelhead said:
Actually looks like its 3. You need 60VAC for the pos rail, so that's a single xformer (using both 30vac secondaries in series), 2 for stereo supplies. You need -15vac for the negative rail, so that's a single xformer (using a single secondary for each channel) for 2 stereo supplies.
Actually, the negative rails are reported at -9vdc as per kari's boards and these supplies give -20vdc. Never really understood the variation in negative supplies but there you have it.
Hi Russ.
Consider making the tracks from C3+ and C4- as wide as possible.
(All the way to the terminal block at the outlet.)
If you go db-sided, you might be able to squeeze in some terminal blocks at the input. The only toplayertrack, would then be
one of the tracks going to the block for AC.
Otherwise it looks pretty.
Although you would miss the "CC" part that way...
Steen
Consider making the tracks from C3+ and C4- as wide as possible.
(All the way to the terminal block at the outlet.)
If you go db-sided, you might be able to squeeze in some terminal blocks at the input. The only toplayertrack, would then be
one of the tracks going to the block for AC.
Otherwise it looks pretty.
"X-CCS-BosoZ" taste the best to me
Although you would miss the "CC" part that way...Steen
