I would say this is part of a SMPSU...probably the part AFTER the switching controller and MOSFETs...
Most DVM:s don't particularly like measuring 100kHz square wave, so it'll likely not give very accurate results.
Another, less scientific reason would be that you're using the DC range of your DVM to measure AC (been there, done that
)
Rune
Another, less scientific reason would be that you're using the DC range of your DVM to measure AC (been there, done that
)Rune
Whose are those voltage and current markings in red? That's what a normal multimeter probably would show at that kind of frequency.
Use an oscilloscope and you'll see a high frequency (40KHz ?) modified sine wave around 30Vp-p, with respect to ground. (42V x .707). Have repaired many, many 12V amplifiers 🙂
Jim
Jim
Voltage at the transformer is AC must be measured with an AC voltmeter that can work at the working frequency. Same applies to the current flowing from tranformer to the diode. You have DC voltage and current only at the output of the full wave bridge them you may measure with DC voltmeter
Yeah...just change ti to AC and try and see the voltage...we would actually want you to have a scope to look at it better...but I guess he doesn't have one...
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