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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
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Old Yesterday, 01:31 AM   #341
kasey197 is offline kasey197
The Dastardly Dad of Three
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
Quote:
Originally Posted by Mark Johnson View Post
Excellent! Please tell members here the voltage dropped (the reduction) from input to output of your cap multiplier, so they can decide whether it would be acceptable in their own application.
That's a good point - I tried a number of logic level mosfets. The one with the lowest drop was the IRL640. With this mosfet, at a load of 1A, the voltage drop was about 2.5V. That total drop includes some (0.3V?) dropped across the passive filter too....
The schematic i used was (post#51): Mean well vs generic power adapter vs audio oriented smps

Quote:
Originally Posted by Mark Johnson View Post
You might also consider uploading the Gerber files of your design, so that other builders can order PCBs and try it out for themselves.
Built mine on veroboard!
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Old Yesterday, 02:59 AM   #342
longspeak is offline longspeak  United States
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
Thanks for the book links Mark, I love the subtitles "A Handbook of Black Magic" and "Advanced Black Magic" .

Very good point about the ground being noisy in a poor setup preventing meaningful measurements. I used a differential configuration (pin 2 to PSU+ and 3 to PSU- on an XLR, using blocking caps in both) to feed the ADC it seemed to help reduce common mode noise. I just got the boards from konst so I'll get a couple of filters built for experimenting.
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