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DC power supply / filament supply PCBs

post #1 of 5
7/10/10 at 11:15am
Thread Starter 

 

filreg_pcb_small.jpg

 

I've had a number of people ask me to make the DC filament supply boards I made for an earlier project available. I've finally gotten around to it...

http://www.pmillett.com/DC_filament_supply.htm


You can use these to provide DC power to a tube filament or heater, or you can use them for any general purpose DC supply.  You can use two to get a bipolar +/- supply as well.

 

I made the PCB the same size/shape/mounting as the Tentlabs supply, so you can try this one (constant voltage) and replace it with the Tentlabs voltage-controlled-constant-current supply without any modifications to your amp.

Pete

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post #2 of 5
7/11/10 at 7:03am

Could these boards be built to handle a GM70 (3A@20V)?  I assume an 845 (3A@10V) wouldn't be a problem. Definitely interested!


Edited by FrankCooter - 7/11/10 at 7:08am
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post #3 of 5
7/11/10 at 10:45am
Quote:
Originally Posted by FrankCooter View Post

Could these boards be built to handle a GM70 (3A@20V)?  I assume an 845 (3A@10V) wouldn't be a problem. Definitely interested!


From the page that was linked,

 

 

Power dissipation

 

Nothing is free.  If you have 1A of current flowing and 2.75V drop across the regulator, you are dissipating (I*R) or 1*2.75 = 2.75 watts of power in the regulator.  That's why it is mounted on a heatsink - it gets warm.  

 

So, the current you can draw from this regulator is limited not only by the regulator IC itself (the 1084 is good for 5A; the 1085 3A), but also by the power dissipated.  The heatsink on the BOM is good for 5-7 watts, depending on how hot you're willing to let it get.  You can get taller or shorter heatsinks that will fit the PCB if you need more or less power dissipation.  And if you're clever you can figure out how to mount it to your chassis for additional heatsinking.

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post #4 of 5
7/11/10 at 1:03pm
Thread Starter 

Quote:

Originally Posted by FrankCooter View Post

Could these boards be built to handle a GM70 (3A@20V)?  I assume an 845 (3A@10V) would't be a problem. Definitely interested!

 

Frank -

 

It should be able to handle it.  Use an LT1084, and try and get no more than 22 - 24V before the regulator.  I'd use a 2" tall heatsink, and maybe mount the heatsink to the chassis to get the heat spread out...

 

Pete

 

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post #5 of 5
8/27/10 at 8:49am

Can these boards be used to provide power to a ss audio circuit?  How much ripple is present?

 

Looking for test power supply (nothing special) & also looking for a very clean supply design to build.

 

Thanks for your help in advance,

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