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Custom whisper quiet psu
- Thread starter Crafty
- Start date
DIY and custom designed projects
tillerman
Member
Very simple circuit and clean layout. If I knew this earlier I could have clubbed in for extra boards. But I have already ordered this psu for my next DAC build.
naboo
Well-known member
naboo
Well-known member
Please share the dac build when you get there, lots of interest on the forum, for sure.
Just the PSU.
I can let go of a board or 2 at R80 each.
I see yours are also using shottky diodes. Clever.
Update.
For the duel output change, I had to get a bigger chassis. I think it looks nice.
The internal output wires is flexible shielded cable. I would have used the same for the fly leads, but could not find a dc socket with a big enough opening at the back.
The fly leads are also shielded. Ground wrapped around the core, then everything wrapped in a foil like material. Should be well shielded.
I shipped the unit with 2 ferrite clip-ons if needed. I doubt it will be needed. Those bolts at the back may be a bit unsightly, but the 12v x 2 transformer is almost 2kg.
Shipped to @georgev
For the duel output change, I had to get a bigger chassis. I think it looks nice.
The internal output wires is flexible shielded cable. I would have used the same for the fly leads, but could not find a dc socket with a big enough opening at the back.
The fly leads are also shielded. Ground wrapped around the core, then everything wrapped in a foil like material. Should be well shielded.
I shipped the unit with 2 ferrite clip-ons if needed. I doubt it will be needed. Those bolts at the back may be a bit unsightly, but the 12v x 2 transformer is almost 2kg.
Shipped to @georgev
naboo
Well-known member
naboo
Well-known member
Definitely got squashed. Which courier?
POstnet
naboo
Well-known member
fredeb
Active member
It may be the weight of the transformer that broke the plastic backplate .
pwatts
Member
Is the regulator just a (unheatsinked) 78xx?
David Morris
Active member
Looks like that may be the case when it was stored upright during transit
It is the mass of the transformer that broke that plate. Dont blame the courier and dont blame the packaging. That transformer is basically a low frequency swinging mass on that thin plastic plate.
Nicely done PCB...!
Thanks. Got them made by PCB Way via Botshop. Took ages, but that was a mishap when an employee left, and my order got lost. They made up for it, so no harm done. 10 PCB's of up to 100x100mm costs a few hundred rand. Will use them again. Lesson... Make sure to remember the drill layer for mounting screws in kicad. I forgot those.
With the Holidays coming to an end, I will take the psu back and reinforce that mounting with a G10 back plate, and screws though the bottom as well.
2 kilos is a lot, I agree, however, they must have dropped it. Even hard handling by hand will not cause that. The packaging was tight, but not so tight to make the bubble wrap useless. So another lesson learned.
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This. Think about this.TO-220 package Temp goes up 62degC per Watt of dissipation. DACs and streamers may want an Amp or more and you would have some 5V drop across the regulator. I'd fit an Aluminium front and back plate + some brackets and use those front and back plates as heat sinks.
Also, while I don't know how much current is required, if you want more than 1 Amp, a 78xx is not going to manage that on its own.
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