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Old 12th June 2005, 05:19 PM   #1
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Default 15V for opamps from 35V ?

How do I get 15V to power my opamps filters from the 35V supply in side my chipamp?

Regulators? Would they need heatsinking?

Potential divider? what size resistors?

TIA. Jim
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Old 12th June 2005, 05:29 PM   #2
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78xx15 and 79xx15 regulators will do yhe job , no heatsink is needed if u will just power one or 2 op amps
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Old 12th June 2005, 05:47 PM   #3
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Thanks.

It will be powering maybe 5 opamps, but can be attached to a heatsink so no problem.
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Old 12th June 2005, 07:07 PM   #4
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Have a look at my quality PSU for op-amps, with board layout www.readresearch.co.uk You would just need to hook the DC supply into where the rectifier diodes would go, very easy.
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Old 14th June 2005, 06:11 PM   #5
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Quote:
Originally posted by richie00boy
Have a look at my quality PSU for op-amps, with board layout www.readresearch.co.uk You would just need to hook the DC supply into where the rectifier diodes would go, very easy.
Before I build it, did you hear the difference between this and a simple 7815/7915 ?
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Old 14th June 2005, 06:18 PM   #6
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78xx and 79xx can take max 35 volts in so it's just about. LM317/LM337 is more suitable I think.
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Old 14th June 2005, 06:31 PM   #7
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Quote:
Originally posted by peranders
78xx and 79xx can take max 35 volts in so it's just about. LM317/LM337 is more suitable I think.
Of yourse you can (and you should) use series resistors.
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Old 14th June 2005, 06:36 PM   #8
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Quote:
Before I build it, did you hear the difference between this and a simple 7815/7915 ?
I wouldn't think so, considering opamps rather good ability to reject powersuply noise.

for a discreet design, i would agree, but opamps? no, i would just stick with the 78\79xx.
if however your standards are a tad higher, go for the lm317\337 series regulators. they have considerably better specs.
they need reference resistors though.

my thoughts
Marius
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Old 14th June 2005, 06:50 PM   #9
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I'll have to admit I haven't directly compared the two side by side. I do know though that the LM317/337 combination measures better in the noise department and has a more tightly controlled output. I also like to just squeeze those extra couple of volts headroom.
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Old 17th June 2005, 12:49 AM   #10
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A LM 7815 should work,

If all you need to power up is a handfull of 5534 or 5532s you probably dont need a heat sink
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