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I'm looking for a circuit to create a fast on/off switch triggered by a phototransistor. The circuit I'm using now has a roll-off at the off cycle, and I need a sharper "off" curve. Supply voltage to pt is 1.5v, with a 4.7k resistor in series. This is being read with a standard computer sound card on the line-in port. It's being used to test shutter speeds on manual cameras. Any help would be appreciated.
odiehunt
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