Re: Edmund Scientific? (pictures) Message #7 Posted by Thomas Chrapkiewicz on 6 Dec 2011, 11:19 p.m., in response to message #5 by gene wright
Gene:
Given the vintage of the machine and the I.C. inside (I believe I saw a TI part in one of the pics), it likely operates on about 5v. It appears that the silver contact is the positive (+), and the gold contact is the negative (-).
The pictures of the batteries (3 button cells in series) and circuitry appears to be some sort of half-wave rectified charging system. I would certainly NOT connect this to the 110VAC under any circumstances!!!!!!!!!!
Assuming that it will ultimately operate, it would be interesting to measure the current consumption, then figure out if more modern button cells (LR44 - NOT rechargeable) would be a viable replacement.
TomC
|