On test server
Sega Game Gear soundcard
TDA2822M test circuit
Sega Game Gear security bolt
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Closeup on the encoder mechanics
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quadrature encoder: 4 state machine
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Debugging an ATmega168
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Sega Game Gear soundcard
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Sega Game Gear soundcard
This is the corpus delicti. At least that's what I hope. The TDA2822M is just a dual amplifier. It gets 2V supply voltage from the main PCB and about +-100mV sound signal. If that's OK must still be checked. The datasheet gives a minimum of 2V as supply.
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