Have you considered biasing a BJT with a zener diode to create a crude current source? It should work from about 1v on up, so long as the Zener can handle the current at max voltage. It would consume power at a fairly large rate, so probably not great for battery powered projects. ----- Original Message ----- From: "Harold Hallikainen" To: Sent: Thursday, June 24, 2004 4:37 PM Subject: [EE:] Constant current diodes or FETs? > I'm loooking for a two terminal constant current device that could be put > between an LED and a variable DC supply to hold the LED current at 5mA as > the supply varies over a 0-10V range (recognizing we're not going to get > it at 0V, but I'd like the widest range possible). So far i've found the > Central Semiconductor CCLM5750 which is a nominal 5.750mA, but it takes > 4.5V to get 80% of the rated current. Anyone have other ideas? > > THANKS! > > Harold > > > -- > FCC Rules Online at http://www.hallikainen.com > > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu