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Old 9th May 2010, 02:52 AM   #21
SY is offline SY  United States
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Quote:
Originally Posted by mtl777 View Post
Thanks, I'll do it then. BTW, is it also commonly done even with good diodes like UF4007?
Haven't seen it done, but that doesn't mean it isn't done. The cap-across-rectifiers was something I did when building RF gear many years ago- before there were UF4007s. Got that trick from the Radio Amateurs' Handbook.
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Old 10th May 2010, 01:53 AM   #22
mtl777 is offline mtl777  United States
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Oh, I forgot about one important detail -- the voltage rating of the bypass cap. The bypass cap I have available is 0.01 uF 100V polyester. Is it gonna be fine for bypassing the UF4007 which has VRRM (max repetitive peak reverse voltage) of 1000V, VRMS (max RMS voltage) of 700V, and VDC (max DC blocking voltage) of 1000V? If not, what should the voltage rating of the bypass cap be?
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Old 10th May 2010, 01:58 AM   #23
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You want a high voltage cap there, with good HF characteristics. 1000V ceramic should do fine.
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Old 10th May 2010, 02:26 AM   #24
mtl777 is offline mtl777  United States
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You want a high voltage cap there, with good HF characteristics. 1000V ceramic should do fine.
Thank you so much! It's good that I asked and didn't put them in yet.

Any particular brand/series you would recommend or just about any 1000V ceramic will do?
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Old 10th May 2010, 02:31 AM   #25
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A good high-voltage Schottky, fast response. Ample capacitance after, and a second-order EMI filter...then the power supply!
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