NP-41 Emulator (may be)

[jebem]

(10-06-2015 12:32 AM)Chris Chung Wrote:  The LCD were ordered to have VLcd at 3.0V as I intend to run the calculator off a 3V coin cell, which I was doing on the photo, except I add a potentiometer to drop it further to 2.9V. When I get the charge pump to work, I can make it software configurable.

It looks good enough to me.
How about the annunciators? Are it readable?

As a last resort, a simple voltage 2-resistor network could be used instead of a potentiometer, as long as the adjustment is not critical (variances between different machine components).