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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: really? posted by Pat Wen on July 19, 2000 at 10:00:14:
Either use a 2 channel scope to measure the peak differential voltage across the diodes or calculate it from the circuit by measuring the AC RMS voltage on the transformer secondary and the DC voltage on the filter capacitor. The peak voltage on the transformer secondary will be RMS * 1.414 (square root of 2). The peak negative excursion will be at least equal to the peak positive excursion which is the DC voltage on the filter capacitor + diode drops. You should always use a diode with a comfortable safety margin as well. The low turn on voltage of Shottky diodes will mean much higher charge pulses to the capacitors as well so I wouldn't advise using them with cheap filter capacitors as they could overheat. There are many things to consider when designing a power supply so make sure you know what you are doing before attempting to "improve" a product.Dave
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Follow Ups
- Re: really? - Dave I 10:33:34 07/19/00 (0)