Thomas Henry Platinum Power Supply

[crashlander42]

I'm building the Thomas Henry power supply http://www.nutsvolts.com/~downloads/January%201998%20Thomas%20Henry%20-%20Power%20Supplies%20for%20Electronic%20Music.pdf . I don't have any 1N4002 diodes. I have 1N4004, 1N4007, and 1N4001. Are any of these suitable replacements. I've never had to substitute a diode, so I'm not really sure what to look for. I hate asking questions like this, but I'm stumped. Thanks in advance for your help.

[fonik]

almost any higher rated diode would do, i guess. 1N4001 would be fine for this design...

[Randaleem]

Hi,

Here's a datasheet for the 1n400x series:

http://www.fairchildsemi.com/ds/1N/1N4001.pdf

You can see that they are all 1Amp diodes and the only thing that changes is the reverse voltage breakdown. 1N4001 is 50V, 1N4002 is 100V, and so on.

Your 1N4004, and 1N4007's will work and each exceeds the designer's original spec.

As Fonik mentioned, you could probably get by with the 1N4001's also . But this is only a 50V diode, and often a diode has to accomodate double the "apparent" voltage you see in the circuit. I'm not immediately familiar with Thomas's platinum power supply, so I can't say for sure how close you'd be if you used the 4001's.

But since you have the 4004's and 4007's, I suggest using either of those and you have no worries.

EDIT: I just looked at the circuit online. I'd use the 04's or 07's for the +/-15V areas. The schematic shows a 36VAC transformer. That 36V AC becomes 50.9 volts when rectified and filtered (1.414 x 36). More or less as your input Line power varies over the course of a day.

Further Thomas adds (first column on page9):"By the way, all of the rectifiers in this circuit should be rated for a peak inverse voltage of at least 100V and a current capability of 1A. The 1N4002 is a good choice here."

The 5V supply has a 9VAC Transformer. 1.414x9 is well within the 50V rating of a 1N4001. You can use your 1N4001's for the 5V part if you want.


Randal

[crashlander42]

Thanks! That's exactly what i was looking for.