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Old 19th October 2004, 06:10 PM   #1
larryg is offline larryg  United States
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Default leach amp power supply

a basic question? testing the power supply, 80vct@6a with rail
voltages of 56 to59 volts dc per specification. im checking the voltage from the
bridge rectifier dc +and -. the filter caps are not connected. i measure +and- 40 volts dc. the secondary ac is 42 vac. if the filter
caps were hooked up, would this bring the voltage to 56to59 vdc?
can someone explain this?
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Old 19th October 2004, 06:12 PM   #2
paulb is offline paulb  Canada
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The filter caps charge up to the peak ac voltage, which is about 1.4 x the RMS ac voltage.
So yes. Even a fairly small cap will make a big difference in your reading.
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Old 19th October 2004, 06:20 PM   #3
larryg is offline larryg  United States
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thanks paulb! im a little confused. if the reading i get from the bridge rec is 40v, is this not dc volts?
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Old 20th October 2004, 11:40 AM   #4
paulb is offline paulb  Canada
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No, it's not DC yet until it's smoothed out by a capacitor. If you had an oscilloscope you could see it. Your meter is kind of showing you an average value.
Some of these articles may help, although they don't address your exact question:
http://sound.westhost.com/articles.htm
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Old 20th October 2004, 02:15 PM   #5
larryg is offline larryg  United States
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Default leach psu

thanks paulb very much! the site you show and your info helps me
to understand the answer to my question!
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Old 20th October 2004, 02:26 PM   #6
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The output of the rectifier is DC BUT has a large amout of ripple riding on top!

If you looked at the DC with a scope, you would see that the DC output is not perfectly flat, there will be large peaks still. your meter is reading the average of those peaks. the filter caps smooth out those peaks and flatted out the DC....



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Old 20th October 2004, 02:36 PM   #7
larryg is offline larryg  United States
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thanks Zero Cool!!
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