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Old 7th June 2012, 03:59 PM   #1
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Default +/-15V supply for op-amps

I need a +/-15V supply to power some op-amps in an active filter network (4 op-amps per channel, specified as 3x LF353N and 1x NE5532N). I don't think I need anything more complex than a standard LM317/337 circuit with a decent amount of reserve in the transformer and smoothing caps. But should I use just one circuit for both left and right channels? Or should I go for one per channel, sharing the transformer output? Anything else to consider?
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Old 7th June 2012, 04:13 PM   #2
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Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Only one for the entire set is sufficient.
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
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Old 7th June 2012, 05:35 PM   #3
BZed is offline BZed  United States
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Remember to put bypass caps at each opamp so the impedance of the power supply stays low at high frequencies.
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Old 8th June 2012, 08:01 PM   #4
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Thanks for that reminder - I've already been caught out with a misbehaving THS4032CD that needed some very close coupled bypass caps.
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Old 10th June 2012, 07:16 PM   #5
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The opamps will only draw ~ 51mA current, you don't really need to put consideration into reserve for the transformer and smoothing caps as it is a regulated circuit. 220uF cap before the regulator and 10uF tantalum or ceramic at each opamp should be sufficient. You could add 0.1uF decoupling at the opamps too but they're not nearly as picky as the high speed THS4032CD.
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