All SIMPLE STEREO USERS, having ULTIMATE UPGRADE fitted inside Atari, can finally switch off/on the STEREO upgrade without drilling case and fitting in switch. Of course, not only stereo...
The idea was as simple as the design - to make the simplest digital-analog switch ( two rows, dual position) that will operate controlled on the logic level.
Please, check below (VCC and GND need also connection):
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