SUPER CAPACITORS FOR BATTERY BACKUP

[ddstoys]

 Ive installed a super cap in a few Bally CPUs as a backup battery and they have worked great is there any way the same could be done for other pinballs???    Like williams games?    5v goes to the 5101ram chip and the batteries are used to hold the memory would it be possible to wire a super capacitor to the + and negative of the ram?   The 5v will charge the cap while the games on and the Cap will hold the rams memory while its off


 

Looking at a system 3 board if i remove the diode thats running between the battery and the 5101 ram the current should reach the capacitor enabling it to charge then keep 5v to the memory when its off

[Retropin]

Yes.. automatically put super caps on all my SS machines... they hold charge really well too. Fired up a game that had not been turned on for nearly a year and the high score was proudly displayed much to my suprise

[Strangeways]

I've installed them on a few Stern and Bally MPU boards without any problems. Should work on Williams games.

[Extra Ball]

can sum1 pls post of pic of this mod?

[Retropin]

Dont have any WMS machines in the collection at present, but the cap is put in place of the +ve and -ve terminals of the battery backup

[ddstoys]

Well ill add one to firepower and let you know how it goes if it works ill do a post on how to do it

[oldpins]

What value cap do you recommend for a system 3 ?

[ddstoys]

The ones i use are from jaycar and they are 1.0f 5.5v they look similar to a button battery

[oldpins]

The ones i use are from jaycar and they are 1.0f 5.5v they look similar to a button battery

Thanks