A question about alternative power supply for hp41 series

[Artur - Brasil]

For those interested in how I made my lateral connector and power supply for Hp41, please see the pictures.
Actually I didn't use one HP power supply for calculators. I got one small transformer (6+6/500mA), two diodes, one capacitor, one 6Vdc regulator and made the power supply.
From a power cable very common on mini-systems, I cut it and separate the two holes (female connectors) and inserted on them one piece of aluminium cut by myself.

Simple and works.