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Old 22nd October 2012, 05:30 PM   #351
cotdt is offline cotdt  United States
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Quote:
Originally Posted by Tea-Bag View Post
I think that's too much current for a BIB, they are more appropriate for solid state power supply re-engineering. But Salas might be able to say more.
Can it do 3A at 5V? It's OK if not. I have a DAC and its analog section that can make use of it, as well as a 40W power amp.
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Old 22nd October 2012, 05:35 PM   #352
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You should use high power very well sinked Mosfets, not the standard ones. Rather the IRF640 & 9640 variety. Thermally inefficient especially on the CCS Mosfet that will have to run the Ih current plus some margin across a minimal 7V in-out drop.
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Old 22nd October 2012, 05:40 PM   #353
Salas is offline Salas  Greece
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If you need go near 3V with a Mosfet you should use a logic level shunt position part. The likes of FQP50N06L.
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Old 22nd October 2012, 05:43 PM   #354
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Thanks Salas! I will try it when I get my boards.
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Old 23rd October 2012, 03:41 PM   #355
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THANKS very much to you and of course to the sainted Mr. Salas for this!

Would you show a picture of a suitable heatsink for the project? I have no idea how to size a heatsink and would like a baseline of what I need to get.

Take care,
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Old 23rd October 2012, 03:47 PM   #356
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Got the payment Rick, do you have a target voltage and current? It will depend on that to a degree. I would think a 3 x 4" one with 1 1/2 fins would be a good guess. Bigger is better here. The one I used in post one was too small.
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Old 23rd October 2012, 03:55 PM   #357
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I also have the following for .50 USD each shipped, one per board allowed if you guys are interested in them. People who previously paid, let me know if your interested.
I have not used it personally, other than using a mass of them to tune a speaker cross over.


.33uf GE cap

If you want them, put it in the paypal notes. Thanks.
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Old 23rd October 2012, 04:26 PM   #358
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Michael,

Now that I know your name from the PAYPAL payment!

My application will be 280 to 300 volts out - 15 mA for the "tubes" plus the 20 mA required.

What do you think?

Thanks, again,
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Old 23rd October 2012, 07:06 PM   #359
Tea-Bag is offline Tea-Bag  United States
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Rick, I don't feel confident enough using the calculators to give totally reasonable advice,
but 300v @ .035A gives 10.5Watts. So assuming a bunch of thermodynamics I never took in college, I would guess something that can shed 15 watts or more.

Volts Watts Amps Converter Tool Calculator

The heatsink calculators I have not figured out yet - but it would be nice to include some calculations in a revised build guide, or in Post 1 for example (which I can edit)

I often use CPU heatsinks from Surplus dead servers, and if it requires more than that, I use the Arctic Thermal epoxy to bind them together.
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Old 24th October 2012, 04:14 AM   #360
Salas is offline Salas  Greece
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The 20mA part will burn on the output sink, the 15mA part will go to the tubes. That 20mA will multiply by the output voltage to give the Watt to burn.

Natural convection heat sink
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