I have a need to generate 9V at 10mA that is totally isolated from a 12V car battery. That is no common negative connection between the car battery and the negative of the 9V supply. Any pointers on how I can do this would be appreciated!
JERD
Buy a 9 volt battery?
Dorfus Dippintush
Depending on how much you want to spend (low power will be cheaper), you could use an isolated DC-DC converter eg Farnell sells a Traco TEL
2-1212 9-18V in 12V out 2Watt for about $35.A linear reg on the output can get you to the 9V since a ready-made 9V output is less common.
HTH Chris.
On Tue, 16 Oct 2007 05:08:22 GMT, "JERD" put finger to keyboard and composed:
Scrounge a 5V-9V DC-DC converter module from an old 10base2 NIC and step down the input using an LM7805.
- Franc Zabkar
-- Please remove one 'i' from my address when replying by email.
How about using the SRS-1209 listed on this page:
Problem solved for under 8 bucks...........
Andy
Farnell have a whole range of isolated DC-DC converters.
102-1604 for example is a 12V to 9V isolated converter @ 111mA. Bit pricey though. You could use a cheaper 12V-12V one and use a 9V regulator on the output.Alternatively, use a battery. A D cell battery pack would last several months at 10mA continuous.
Dave.
The links below shows something close, 9v @2ma, maybe you can beef it up a bit to get 10ma.
Here's something from National.
Or from Linear Tech
If all else fails try googling "isolated flyback".
Mike
"I think, therefore GOD is." J.P. Moreland
Thanks for feedback guys. Most helpful and I now have some options!
JERD
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