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XFMR may add more drop than the rectifier.

Posted by VoltSecond (M) on January 10, 2025 at 15:45:28

In Reply to: The one with the lowest voltage drop posted by Chip647 on December 28, 2024 at 20:21:07:

Beware of the point of diminishing returns. The resistance of the power transformer's primary and secondary are in series with the rectifier. For a >>>quick estimate<<< of the total resistance, just double the secondary's resistance.

5AR4 10V/0.25A = 40 ohms.
5V4 26V/0.175A = 148 ohms.

With a 150 ohm secondary (300 ohm primary + secondary estimate), changing rectifiers isn't going to help a lot.

I have had really good luck with "capacitance multipliers" at low voltages (24V). They should also work well at high voltages. Just beware of the SOA of the pass element.

.





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Unplug it, discharge it and measure it (twice) before you touch it.

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