Hi folks
I need to build a PSU for the pair of ACA boards I have, which I intend to use to make a pair of monoblocs.
So I was looking at the diyAudio PSU board v3, but building it as a point to point version.
This is the original schematic minus the rectifier section as I plan to just use a monolithic rectifier as I already have several of those.
For powering an ACA board, I believe I can simplify that to this:
To build it point to point in the way I was envisaging, can I do it like this?
C1-C8 would be Dubilier 6700uF 35v caps I already have, but I'm not clear on what values for the other parts, assuming I want a 24V output.
I need to build a PSU for the pair of ACA boards I have, which I intend to use to make a pair of monoblocs.
So I was looking at the diyAudio PSU board v3, but building it as a point to point version.
This is the original schematic minus the rectifier section as I plan to just use a monolithic rectifier as I already have several of those.
For powering an ACA board, I believe I can simplify that to this:
To build it point to point in the way I was envisaging, can I do it like this?
C1-C8 would be Dubilier 6700uF 35v caps I already have, but I'm not clear on what values for the other parts, assuming I want a 24V output.
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Hello Ian, have you tested it?
I was confused because most of them use laptop power supplies. And in the end I ordered 2 SMPS, and I was waiting for my order to arrive.
I was confused because most of them use laptop power supplies. And in the end I ordered 2 SMPS, and I was waiting for my order to arrive.
I never built the PSU as no-one replied so I didn't know what values to use to get a 24V output. The ACA boards are ready to go, but I haven't mounted them in a suitable chassis yet. I have the chassis, just been too busy with other projects.
R7 is about 2.2K. It depends on LED and brightness you want but the calculation is the following (Ohm's law): R = 24 - Vled / 10mA (10mA is the standard current in a LED, but you can have a range of 1-15mA, 1mA it is for very efficiency led, see datasheet of the LED). So 24 - 2.2 / 10mA = 2.2k -> assuming that a LED has a Vf of ~2.2V. See datasheet to be sure (range is about 1.4V-2.5V, depends on LED used).
Ian, go over to the Pass forum and check the F5 PSU schematic... it uses 24VDC rails.
Some good info there on building exactly what your after. I'm about to build an F5 and still contemplating an external PSU for it, so I can run my ACA from it too!
Some good info there on building exactly what your after. I'm about to build an F5 and still contemplating an external PSU for it, so I can run my ACA from it too!
Ian:
You're on the right path. In an unregulated circuit like the one you're contemplating, the rail (i.e., DC) voltage is largely dictated by the voltage on your transformer's secondaries. Use a transformer with 18V secondaries to get about 24VDC after your rectifiers. I built an integrated amp (BOZ preamp and bridged ACA) for my daughter a few years ago which included two power supply boards for the amp -- one board for each channel. Here are a few photos.
Regards,
Scott
You're on the right path. In an unregulated circuit like the one you're contemplating, the rail (i.e., DC) voltage is largely dictated by the voltage on your transformer's secondaries. Use a transformer with 18V secondaries to get about 24VDC after your rectifiers. I built an integrated amp (BOZ preamp and bridged ACA) for my daughter a few years ago which included two power supply boards for the amp -- one board for each channel. Here are a few photos.
Regards,
Scott
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Ian,
here's exactly what your looking for.. diyAudio Power Supply Circuit Board v3 illustrated build guide
Links to the PSU schematic, parts list and build guide for a ~24vDC PSU.
Good luck with the build, dont forget to come back and comment on how the ACA sounds with your V3 PSU
here's exactly what your looking for.. diyAudio Power Supply Circuit Board v3 illustrated build guide
Links to the PSU schematic, parts list and build guide for a ~24vDC PSU.
Good luck with the build, dont forget to come back and comment on how the ACA sounds with your V3 PSU
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Ian, did you ever read Rod Elliotts article concerning a "CapMultiplier - PSU" as the ACA's PSU?
Capacitance Multiplier Power Supply Filter
I did! And I have built one, connected it to my ACA and have been absolutely astonished about
how much superior the sound has been compared to a wall-market PSU, to a SMPS, the forum's
proposal, ...
It is your decision, it is your ears - Rudi
P.S.: Find attached a PCB look-through of the CAPMx PSU that I am using to power my ACA!
Capacitance Multiplier Power Supply Filter
I did! And I have built one, connected it to my ACA and have been absolutely astonished about
how much superior the sound has been compared to a wall-market PSU, to a SMPS, the forum's
proposal, ...
It is your decision, it is your ears - Rudi
P.S.: Find attached a PCB look-through of the CAPMx PSU that I am using to power my ACA!
Attachments
Wow. Thanks. I'd never heard of a capacitance multiplier!
This might also be a good experiment for my valve phono stage.
Dan
