4 Tap DC Converter/Isolator

Phil hodson said:
Have you used these yet? Just wondered how you got on? Is 333mA too much I was wondering? Can you ever have too much :)
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Tried that on my first build... 2x111, 1x222 and 1x333. Changed it to 4x111, from my understanding, the regulator is the bottleneck. Could not save the two converters I had to take out.
 
Out of curiosity, have you measured the output with a load connected?

XP Power has switched up their catalog quite a bit over the past few months, but they do offer regulated versions of their DC/DC converters.


comradehoser said:
Some redditor maintains that running at 10v-11v might be functional but it will eventually mess pedals up, particularly with digital.
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Any digital circuit should have a voltage regulator (or multiple) that can handle a 1-2V variation in supply voltage. I'm not going to claim it's ideal, but I also do not believe you are going to have a catastrophic failure.

We could add voltage regulators to each output but idle current will increase significantly... We could counter that by removing the "Universal Input Voltage" ability and just power the thing from a normal 9VDC power supply like any sane person would do.

Is anyone powering this with other than 9V or 12V DC? I would imagine that percentage is small.
 
@Robert, just to note there is an inconsistency in the docs and board print. One part of the docs specify 50v power rating for C1 and C6, board print and the other part of the docs only for C6. Not a huge thing, but it did make me paranoid enough to desolder a second 50v rated 100uf from another pedal.
 
comradehoser said:
One part of the docs specify 50v power rating for C1 and C6, board print and the other part of the docs only for C6.
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Ahh thanks for the heads up. C6 is the only capacitor that should have been listed at 50V, and only if you're powering it at a voltage that would require it.

I think I went with 50V all the way across, just because.

Corrected. :)
 
Robert said:
Out of curiosity, have you measured the output with a load connected?
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Found this thread while troubleshooting the same issue. Thanks for the tip, Robert! I built one converter using XP Power ITR0305S09 (333 mA) and another using TRACO TBA 1-0519 (110 mA). I tested them using both a battery and cheapo power supply. The DMM placed at each output jack of the converter yielded around 12v for these 9v-output converters. After reviewing the datasheets for these converters, I understood why testing under load is important.

XP Power ITR0305S09 (loading curve).png
TRACO TBA 1-0519 (loading curve).png

To the XP Power converter (333 mA per output jack), I attached a 10% load via the SuperHeterodyne (34 mA) and measured voltage at the PCBs input terminal as 9.6v. Much better! It also turned out that even a very small load (B-Side Fuzz drawing 6 mA) brought the voltage down to 9.8v. I found similar results for the TRACO converter, though of course the load curves are different. These loaded voltages coming from the 4-tap converter are not that far off from a fresh 9v battery (9.5v-ish?), which makes me feel a lot better about plugging pedals into these converters. Now I just need two properly drilled enclosures for these little guys...

PXL_20260103_161528103.jpg
 
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