On Mon, Oct 16, 2000 at 12:57:06PM -0400, Wayne Shumaker wrote:
> For anyone interested in a battery replacement for a 1.35V mercury
> cell, I just tested one of our (Linear Technology) LDO regulators (low
> drop out regulator) and it seems to work. The part is the LT1761. (see
> www.lineartech.com for the data sheet). For an input I used a 1.5V
> source (1.5-1.55V is typical for silver oxide battery) and the
> regulated output was 1.35V. The part draws 20uA of quiescent current
> and easily handled 300uA load, which is probably more than enough for
> an OM-1. The part requires two external adjust resistors to set the
> output level and an output bypass cap of 1uF (see page 12 of the
> datasheet for the circuit). I used a 1.5Meg and a 193K resistor to set
> the output to 1.35V. The part is in a tiny SOT-23 package. The circuit
> can be turned off by putting it in series with the off switch or by
> using an optional shutdown pin. I have half a dozen parts if anyone
> would like one to try for them self. Requires good soldering skill.
This sounds neat...it should be fairly simple (!) to make up a little PC
board that would sit between a battery and the contact spring int he battery
compartment and do the regulation. I'd like to give it a try.
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|