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Topic: TTL to -22Vdc Driver (Read 445 times) previous topic - next topic


Hello everyone!!!
I would like to know if this circuit can be upgraded with a more up to date transistor?
Is to drive a big old 7seg display that uses BCD. Since it has 5 digits it uses 20 lines for data transition.
I got this display in ebay, but since is kind of old for some reason it uses -22Vdc logic...!!

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