I need 15 volts regulator from 40 volts DC - diyAudio
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Old 3rd May 2011, 04:31 PM   #1
sunny is offline sunny  India
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Default I need 15 volts regulator from 40 volts DC

I need 15volts dual power supply for my TL072 subwoofer preamplifier. I'm getting around +38 ,0,-38v volts DC from my power amplifier. I have one option to use 7815 regulator but i think it's maximum voltage is only 35 volts.So is there any other regulator like 7815 that can withstand input voltage upto 40 volts DC?
Please help.

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Sunny
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Old 3rd May 2011, 04:37 PM   #2
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The LM317 and LM337 are what you're looking for.
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Old 3rd May 2011, 04:40 PM   #3
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I need fixed 15 volts voltage regulator just like 7815 and 7915.
Please help.

Sunny.
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Old 3rd May 2011, 04:48 PM   #4
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So "fix" the LM317 and LM337 at +15 & -15.
Or lower the 38V using the LM317/LM337, then use your precious 7815/7915.
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Old 3rd May 2011, 05:00 PM   #5
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Old 3rd May 2011, 05:02 PM   #6
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Quote:
Originally Posted by sofaspud View Post
So "fix" the LM317 and LM337 at +15 & -15.
Or lower the 38V using the LM317/LM337, then use your precious 7815/7915.
Can you please give me the circuit diagram how to fix the LM317 and LM337 at +15 & -15?

Thanks,
Sunny
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Old 3rd May 2011, 05:27 PM   #7
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Quote:
Can you please give me the circuit diagram how to fix the LM317 and LM337 at +15 & -15?
I don't have a diagram handy to upload, but you can find one easy enough in the datasheets or online. The resistors to set 15V are 220 ohms from the output to adjust pin and 2400 ohms from the adjust pin to ground.
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Old 31st May 2011, 05:46 PM   #8
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I have the same question. 38v to 15v is a big step down. That's the reason I wodnt't try the 317/337 regs. I think they could overheat and blow easy, even with heatsink.
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Old 31st May 2011, 05:51 PM   #9
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If you only want to run an opamp or two then a simple resistor/zener regulator is a good option.
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Old 31st May 2011, 06:00 PM   #10
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Quote:
Originally Posted by sunny View Post
Can you please give me the circuit diagram how to fix the LM317 and LM337 at +15 & -15?

Thanks,
Sunny
Please try looking at the LM317 datasheet.
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