Woodstock battery modification

[Sadsilence]

(09-10-2016 10:59 AM)Maximilian Hohmann Wrote:  

(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?).

Agreement. It is a workaround as woodstock's power adapter delivers ac and too much output voltage for directly driving calculator. Some capacitors and diodes can do ac/dc conversion and voltage cut. Nevertheless curcuit looks frightening simple ;-).

P.S. Found a similiar curcuit in an HP19C (Only 1 capacitor and 1 diode ;-)) and it is (after remodifcation) still alive...