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PostPosted: 30 Aug 2008, 10:18 
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gofar99 wrote:
The 1N4007 rectifiers are OK, but I find that "faster" ones work better.

Something like the UF4007 will work well and these are also dirt cheap.
gofar99 wrote:
I don't have the specs here on the 78T12 tp know if it will handle that load.

78T12 is 3A and voltage drop is 3V.
billnchristy wrote:
How's this?

That looks good. That is what I meant about using the current draw on the program. Like Bruce mentioned, you will want some small bypass capacitors as well.

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PostPosted: 30 Aug 2008, 11:00 
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Damn, I guess I have to buy new iron after-all. :(


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PostPosted: 30 Aug 2008, 12:26 
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How come? If the voltage is too high you can use a resistor or choke to get it to the value you want.

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PostPosted: 30 Aug 2008, 12:31 
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Well, my 275 is too high for the plate...that is just a little much to drop and it would require a new choke to use it because of the huge voltage swing.

I think I will just get a 180v edcor and keep the 275 for a higher voltage project.


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PostPosted: 04 Sep 2008, 21:20 
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billnchristy wrote:
Well, my 275 is too high for the plate...that is just a little much to drop and it would require a new choke to use it because of the huge voltage swing.

I think I will just get a 180v edcor and keep the 275 for a higher voltage project.


Your 275V transformer is not too big. I did a simulation on PSUD and this is how you can use your 275V transformer if the aikido load is 42ma as you specifiy on your PSUD simulation.

B+ will be around 245V (close enough to 250V) and ripple is 2uV which will be extremely quiet for a preamp PSU.

HTH.


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