Re: DC-DC Conversion
- From: Joerg <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 06 Dec 2006 01:05:22 GMT
bill.sloman@xxxxxxxx wrote:
me wrote:
"news.gatech.edu" <bdawg02@xxxxxxxxxxx> wrote in
news:el4dli$t8b$1@xxxxxxxxxxxxxxxxxxx:
Hello,
So I'm building a stereo amp. My rail voltages are +/- 56 Vdc. I'm
trying to add a level indicator that works with some op-amps and LEDs
(pre-existing circuit, all ready to go). So basically I need to get
power to the op-amps somehow.
How can I convert +/- 56Vdc to +/- ~8-18Vdc to run the op-amps off
the
same power supply?
Any help would be appreciated.
Thanks!
A voltage regulator IC (lm317/337, 7815/7915, etc) would probably be a good
to start.
The LM317HV might survive in that job
http://www.national.com/pf/LM/LM317HV.html
but the LM337HV would be vulnerable.
http://cache.national.com/ds/LM/LM137HV.pdf
You can protect a linear regulator against out-of-range supply voltages
in a variety of ways, but it can be a bit tricky.
For low-powered op amp circuits, a power resistor and high-disipation
zener can be a lot easier and much more reliable (unless you really
know what you are doing).
But it will most likely not result in top notch HiFi performance. Worst case you get motor-boating because some PSRR ain't enough. The real way to do it is to drop it to, say 25V with a transistor/zener. Then plop nice regulator chips in there to create clean supplies.
--
Regards, Joerg
http://www.analogconsultants.com
.
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