Omega Race help/questions

joemagiera

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1) I plan on using a non-rechargeable battery on an Omega Race PCB. What is the best & easiest way to defeat/stop the recharging circuit?
2) Reviewing the schematics, it looks like the +12 is only used for the audio circuit. Which (if any) IC's use +12? If none, what other components on the board use the +12?
 
1) I prefer a 5101 NVRAM instead of battery. YMMV
2) Whatever the schematic shows is where the +12V is used. (laughs) J3-9 for LM383 sound amps.
 
I believe the game at work has supercap. I didn't do that mod. it just kind of works. I never even bothered to look at what type of CMOS it uses so +1 @VectorCollector lol
 
I believe the game at work has supercap. I didn't do that mod. it just kind of works. I never even bothered to look at what type of CMOS it uses so +1 @VectorCollector lol
Supercap or NVRAM, shoudln't the recharging circuit still be disabled? Anyone?
 
I would think you want power to the super cap to keep it charged. NV ram wouldn't be in the charging circuit so either way I guess. Nope.
 
Supercap or NVRAM, shoudln't the recharging circuit still be disabled? Anyone?
supercap you keep the juice, you don't have to modify anything then. it would just replace the battery.

NVRAM the battery supply is localized to the CMOS chip itself then. no further modification needs to be done to the charging circuit there.

the only way you would need a blocking diode is if you're using nonchargeable batteries like AAs in a battery holder. I think that covers everything. otherwise you can pretend it's 20 years ago and use a cordless phone battery. which I'm kind of intrigued that they still sell those. lol
 
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