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diyAudio Power Supply Circuit Board v3 illustrated build guide
diyAudio Power Supply Circuit Board v3 illustrated build guide
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Old 17th May 2020, 08:34 PM   #1281
soldersmoker is offline soldersmoker  United States
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diyAudio Power Supply Circuit Board v3 illustrated build guide
What's a good ballpark figure for the diode's heatsink's C/W (thermal resistance)? I'm using FEP30DP and the PSU will be powering an F4.

Last edited by soldersmoker; 17th May 2020 at 08:40 PM. Reason: dropped a word
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Old 17th May 2020, 09:15 PM   #1282
Mark Johnson is online now Mark Johnson  United States
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diyAudio Power Supply Circuit Board v3 illustrated build guide
This Vishay diode is in the exact same package, but its datasheet has a larger amount of information about thermal resistance. Maybe it will be a useful surrogate?

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Old 17th May 2020, 09:24 PM   #1283
6L6 is offline 6L6  United States
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diyAudio Power Supply Circuit Board v3 illustrated build guide
Ive run the FEP30DP with no heatsinks, in similar circumstances. They heat up, but not too bad. (YMMV)

Look at their forward voltage drop vs. temperature curve, it’s interesting.
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Old 17th May 2020, 10:12 PM   #1284
soldersmoker is offline soldersmoker  United States
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diyAudio Power Supply Circuit Board v3 illustrated build guide
Thanks Jim, I really appreciate your help. I see the current drops off a table after the temperature hits 100C according to the forward current derating curve. I didn't notice anything about the forward voltage drop though. But there's a lot I miss . . .

And thank you, Mark, but it looks like I can use what I have after all.
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Old 22nd May 2020, 12:53 AM   #1285
lonepine510 is offline lonepine510
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Forgive me if this has been asked- are there recommendations for connectors so that one can swap out different amp boards at a later time, using the same PSU? I just ordered the PCB and this is my first time building a PSU. Thanks!
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Old 22nd May 2020, 10:13 AM   #1286
ItsAllInMyHead is offline ItsAllInMyHead  United States
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diyAudio Power Supply Circuit Board v3 illustrated build guide
Many people use FastOn type connections.

Something like this. Check the datasheet for dimensions etc to make sure, but I think this matches what I used.

1287 Keystone Electronics | Connectors, Interconnects | DigiKey
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Old 22nd May 2020, 05:46 PM   #1287
rollingtube is offline rollingtube  Germany
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Hi,
this just to report success in building a v3 universal PSU - MUR3020W rectifiers, 8x22000F capacity, 24V rails. Easy build, works like charm. I was just surprised how hot (still touchable) the heat sinks get...working duty on an 0.95A-biased stereo F6 with ventilated cover plate.

The only "problematic" point I had was that the space between the rectifier heat sinks are quite tight for the transformer snubbers - so some of that went under the PCB. Otherwise, no issues. Thanks everyone who worked on the design of this!
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Old 22nd May 2020, 08:06 PM   #1288
thompsontechs is offline thompsontechs  United States
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diyAudio Power Supply Circuit Board v3 illustrated build guide
Quote:
Originally Posted by rollingtube View Post
Hi,
this just to report success in building a v3 universal PSU - MUR3020W rectifiers, 8x22000F capacity, 24V rails. Easy build, works like charm. I was just surprised how hot (still touchable) the heat sinks get...working duty on an 0.95A-biased stereo F6 with ventilated cover plate.

The only "problematic" point I had was that the space between the rectifier heat sinks are quite tight for the transformer snubbers - so some of that went under the PCB. Otherwise, no issues. Thanks everyone who worked on the design of this!

Might want to insulate those bare legs on the LED, it'd be pretty easy to bend them into a short. Just sayn.
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Old 22nd May 2020, 10:30 PM   #1289
Ben Mah is offline Ben Mah  Canada
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diyAudio Power Supply Circuit Board v3 illustrated build guide
Quote:
Originally Posted by lonepine510 View Post
Forgive me if this has been asked- are there recommendations for connectors so that one can swap out different amp boards at a later time, using the same PSU? I just ordered the PCB and this is my first time building a PSU. Thanks!
Another option is to use Molex bullet plug connectors on the wires.

Snap Plugs and Receptacles - Molex

Colour code them so no mistakes in hookup. The advantage of connection in the wire over connection on the board is that there is not excess force exerted on the board during connection or disconnection.
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Old 22nd May 2020, 11:51 PM   #1290
ItsAllInMyHead is offline ItsAllInMyHead  United States
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diyAudio Power Supply Circuit Board v3 illustrated build guide
oooooooh - those are nifty! Thanks, Ben. I've added a few of those to my next cart to try out.
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