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Coin-Op : Arcade : Missile Command : KB-1775-2

Title

Atari Audio Regulator II upgrade

Author

James Bright

Article

Atari's Audio Regulator II board uses +SENSE and -SENSE to help regulate voltage on the power supply. Unfortunately, bad connections can sometimes cause invalid return values and affect voltage reading. (Essentially this was a good idea on paper, but bad in practice.) To avoid burning out the regulator board -- usually R29 -- make the following modifications:

Tie +SENSE to +5V
Tie -SENSE to ground

You can do this by making the following jumper connections on J7:

Tie J7-3 to J7-5 / J7-5 (+5)
Tie J7-2 to J7-1 / J7-4 (+5V return aka ground)

Double check with your Audio Regulator schematics.

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