Woodstock battery modification

[Maximilian Hohmann]

(09-10-2016 10:34 AM)damaltor Wrote:  they might protect the caps from overvoltage?

Rather the calculator! This looks like a fairly primitive circuit for smoothing the current (capacitors) and limiting the voltage to the calculator (diodes, maybe one of them a Zener-diode?). I would not want to use any of my woodstocks like this, rather connect them to a properly regulated and protected power supply set to 2.5V. Or, as I prefer, use it with externally charged batteries and hide the original chargers very deep inside some drawer...