I have just completed and tested my dual powersupply for my latest GC.
At the moment all that i have tested is the transformer wiring and the rectifiers.
The transformers are supply 19.1V into the rectifiers, and the rectifiers are showing +/-17.5V DC at the output.
I am using BYV44 diodes. Now I know about the 1.414 multiplier to get the DC voltage, so why only 17.5V on my multimeter.
I am guessing that it has something to do with the ripple and the lack of any form of smoothing caps, which is dragging the average DC voltage down. I presume that the line votage will rise when I apply the filtering caps.
Anyone care to comment ??
Shoog
At the moment all that i have tested is the transformer wiring and the rectifiers.
The transformers are supply 19.1V into the rectifiers, and the rectifiers are showing +/-17.5V DC at the output.
I am using BYV44 diodes. Now I know about the 1.414 multiplier to get the DC voltage, so why only 17.5V on my multimeter.
I am guessing that it has something to do with the ripple and the lack of any form of smoothing caps, which is dragging the average DC voltage down. I presume that the line votage will rise when I apply the filtering caps.
Anyone care to comment ??
Shoog
Shoog said:
I am guessing that it has something to do with the ripple and the lack of any form of smoothing caps, which is dragging the average DC voltage down. I presume that the line votage will rise when I apply the filtering caps.
Yes.😉
Hey Shoog,
Invest in a fluke true rms multimeter, this will probably give you the 25/26 volt you are looking for.
Invest in a fluke true rms multimeter, this will probably give you the 25/26 volt you are looking for.
Bozzz said:Hey Shoog,
Invest in a fluke true rms multimeter, this will probably give you the 25/26 volt you are looking for.
I think RMS values for non-sine signals are of questionable
use in most cases. If he should invest in anything it should be
a scope, then he can see what the signal looks like and read
off the peak values etc, ripple voltage etc, which are of much
more interest. A cheap multimeter and a cheap scope is of
much more use than an expensive true RMS multimeter only.
Hi,Bozzz said:Invest in a fluke true rms multimeter, this will probably give you the 25/26 volt you are looking for.
RMS values of AC signal and full rectified with ideal diodes are equal. Shoog's meter is fine.
Christer said:A cheap multimeter and a cheap scope is of
much more use than an expensive true RMS multimeter only.
Yes. I agree.
Regards
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