GB Cartridge Probe Holder for Battery replacement

thingiverse

An overkilled Game-Boy Cartridge holder to keep SRAM powered during a battery replacement and thus keeping your precious saves. Taking use of Test-Point at the back of cartridge PCB. TP1 : RawPower -> Direct connection to SRAM's +VCC TP2 : +3V pin of Battery/GB power manager µC (ref 134A or 26A) (TP2 is connected to TP3 via 10k Ohm resistor R1) TP3: +3V Battery TP4: GND !!! WARNING: On first picture pogo pin is placed on wrong test-point. Supply +3V on TP3 will keep you SRAM powered but will damaged your already nearly depleted coin cell !!! Minimal circuit for correct use is to supply +3V between TP1 (+VCC) and TP4 (GND), which could be achieve by soldering a CR1616 between 2 pogo. A proper circuit would use a battery holder (there is enough room for 2 AA cell for exemple) and eventually use feedback from TP2 to shine a led to inform of correct pogo-pin contact. Designed for 1.5mm diam pogo-pin, but it would accept any size with a little drill help. Future improvement would be the add of something to apply pressure to the pcb to maintain it on the pogo. Ideally a clamp with a spring for easy remove. Circuit schematics are available here thanks to Jeff Frohwein's work : http://www.devrs.com/gb/files/hardware.html http://www.devrs.com/gb/files/mbc1.gif http://www.devrs.com/gb/files/134a.gif