The microcontroller, usual stuff 8031, eeprom, 74138 3-8 multiplexer for the LED row selects. Each output of the 74138 drives a transistor for the positve side of the LED matrix or selects one of 3 the TI display ICs.
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Tacho go split
The microcontroller, usual stuff 8031, eeprom, 74138 3-8 multiplexer for the LED row selects. Each output of the 74138 drives a transistor for the positve side of the LED matrix or selects one of 3 the TI display ICs. Reply |
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