[sdiy] thanks for replies - Blue LED

[John Luciani]

On 10/21/06, Paul Perry <pfperry at melbpc.org.au> wrote:
> I think an ICL7660 or one of the many similar 'improved'
> voltage inverter/doublers should work. Looking at the data sheet,
> they run fine on very low voltages... pretty cheap too.

I agree. I am not sure of the price target.

I like the NCP1729 used as a voltage inverter. Vcc from 1.15-5.5V
(perfect for 2-3AA),
Iout of 50mA. Place the anode of the led on Vcc and the cathode on the
-Vout. Use the /SHDN to turn the LED on and off. Using this part as an
inverter, rather than a doubler, saves two diodes. Price of the IC is
probably around $0.80-$0.90 in small quantities.

(* jcl *)

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