Electronics > Beginners
Stairstep generator using 555 and op amps
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rstofer:
As the revised circuit shows, it can operate from a 9V battery or anything higher than about 5V.  Redesigning it to use split supplies is counterproductive.  You would also need to rethink that reset timing circuit because it would be pulling the timing capacitor to well below 0V.  Timing would change, and so on.

There is a user 'w2aew' (alan) and he posts here quite often.  His videos are excellent.
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