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Old 29th February 2012, 07:46 PM   #1
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Default Dual Power supply for my pre-amp

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Last edited by SLAK; 29th February 2012 at 08:59 PM.
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Old 29th February 2012, 07:56 PM   #2
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Hi.
Usually the old and popular 78XX (positive side ) and 79XX (negative ) are used for this purpose . By using one 7815 and one 7915 ( beware of the legs that are different position for ground and output...also input ! ) you'll have a regulated dual supply. If you want , you can use variable voltage regulators , to get the maximum voltage allowed by your circuit ; those are the famous and old LM 317 and LM337 (negative side ) .Old but good !
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Old 29th February 2012, 08:01 PM   #3
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Quote:
Originally Posted by picowallspeaker View Post
Hi.
Usually the old and popular 78XX (positive side ) and 79XX (negative ) are used for this purpose . By using one 7815 and one 7915 ( beware of the legs that are different position for ground and output...also input ! ) you'll have a regulated dual supply. If you want , you can use variable voltage regulators , to get the maximum voltage allowed by your circuit ; those are the famous and old LM 317 and LM337 (negative side ) .Old but good !
Hello,
Thanks for the quote,
Well.... Without the regulators i am getting a output of 42VDc from this board where as the input to the board is 18-0-18ac, IS THAT NORMAL??
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Old 29th February 2012, 08:05 PM   #4
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What's the capacitors voltage ?
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Old 29th February 2012, 08:06 PM   #5
pdul is offline pdul  Denmark
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with the schematic shown it is not only abnormal it is impossiple
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Old 29th February 2012, 08:10 PM   #6
pdul is offline pdul  Denmark
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Otherwise you have an invention that can save the worlds energy situation
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Old 29th February 2012, 08:18 PM   #7
pdul is offline pdul  Denmark
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Did someone remove some posts? why?
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Old 29th February 2012, 08:22 PM   #8
pdul is offline pdul  Denmark
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Half of this thread disappeared suddenly How? Why?
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Old 29th February 2012, 08:24 PM   #9
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Voltage doubles ,thread halves
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Old 29th February 2012, 08:37 PM   #10
pdul is offline pdul  Denmark
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seems like this thread is running in both solid state and powesupply
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