| Electronics > Beginners |
| cheap chinese adjustable lab power supply kit on ebay ( 3AG1 , xiaolin ) |
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| mikerj:
Those small bursts may be caused by diode commutation; rectifier diodes switch can on and off pretty quickly which causes high frequency current spikes. This can cause ringing in the interconnects between diodes and capacitor. For this reason you will commonly see low value capacitors (~10n) connected across each rectifier in a full bridge when used in noise sensitive applications (radio, audio etc.). |
| sairfan1:
For cheap chines power supplies best option is RD Tech https://rdtech.aliexpress.com/store/923042 Dave also reviewed some of their power supplies they are tested and well rated, You will find options from something like $10 to $75 even comes with PC software to analyze data. |
| floobydust:
--- Quote from: schmitt trigger on April 02, 2019, 01:20:04 pm ---Sorry for resurrecting an old thread but... What are those oscillations? --- End quote --- That trace is apparently ripple across the 4,700uF filter cap. It's probably power line hash or rectifier-recovery ringing with the transformer leakage inductance. 6A10 has no reverse-recovery spec. Thanks Diodes Inc., Rectron, Kingtronics and all you copycats. It's probably a slow diode. Or Voltlog has dirty mains full of SMPS noise. TBH I'm used to Rigols adding nonsense to waveforms, if there is EMI on the scope ground. |
| Cliff Matthews:
About Voltlog's video: Was there a problem wiring that tiny CMI filter on the secondary? |
| schmitt trigger:
Flooby; I believe that your list of possible causes is correct. A combination of the factors listed. |
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