--0-2011002529-1044575210=:48441 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Many thanks to the guys who answered about the LM2936 reg. RS Components do have it - Rockby don't, haven't checked Farnell. Hmmm ... looking at the data sheet, it only comes in SMD & T092 & only gives 50mA max so I don't know how usable it would be. The problem is that I want to use it as power supply in a remote camera that's likely to be left out in the sticks for a month, may 2 months, so minimal current drain is essential. But the cct uses opto couplers to fire a solenoid & read input data when it goes active, so in its active state it'll pull maybe 100mA off the 5V rail. The solenoid & sensors work directly off the 12V gel battery so they don't affect the LM2936. I thought i'd bonk up the 2936's current capcity with a pnp booster transistor - saw the idea in NS AN103. The idea is the PNP (BD140) only comes on when there's a demand for more than about 40mA. The question is .... ... do u see any sneaky little current paths to GND in the attached gif that i haven't thought of? Or is there some better way entirely to do it? Gotta keep the steady state drain real low in passive mode, which is most of the time. Thankz for advice - Debbie :) --------------------------------- Yahoo! Greetings - Send some online love this Valentine's Day. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! 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