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How to power the diode and not burn the logic?
Task: a decoder + a self-segment indicator to assemble a small decoder of a binary signal (set by switches) into a decimal one. I already assembled a small version habrahabr.ru/qa/27337/
And now the seven-segment indicator will be large, which lights up at a voltage of about 12V. And the logic can only be supplied with 5V. How do you put all this stuff together?
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I did this on the watch: dl.dropbox.com/u/22991016/03_BigDigit.png
Indicator with OA. For each segment of the field. The indicators are 35mm, under it the register and 8 smd transistors are easily placed on the board
. There are specialized driver microcircuits.
If it’s very powerful, then you can switch through Darlington assemblies ULN2003 / ULN2004
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