On Sunday 27 April 2003 16:14, William Chops Westfield wrote: > A lot here depends on what your 15V supply is REALLY putting out. If > it keeps outputting 15V even at full load, you're probably in good > shape. If it's completely unregulated it probably puts out more than > 15V at low loads, and less than 15V at high loads, in which case you > could have problems depending on how close YOUR top load is to what > the power supply thinks is full load. (OTOH, if we're talking FANS, > I don't think you have much to worry about.) > > Have you measured what the voltage looks like at the input to the > regulator at all? A simple voltmeter should be sufficient. > > BillW I briefly mentioned this much earlier in the thread, that I've got a meas= ured=20 14.2V (very regulated) at the input to the 7812, and at full load=20 (power-resistor to draw 1A), I get 11.9V out. Whereas I don't necessaril= y=20 trust the meter is accurate to .001%, it is the same meter used on both=20 checks. But these may/will change under different load conditions, which= is=20 why I'd like to adjust for the safety margin. Cheers, -Neil. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads