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Subject: rising edge detection circuit

Date: 07/11/02 at 4:14 AM
Posted by: junyi
E-mail: yapjy@pmail.ntu.edu.sg
Message Posted:

Hi,
I have a movement detection setup using lasers. An electrical signal is given off by the laser when something is blocking the beam. For example, if my hand blocks the laser beam, the laser will give off a 5V signal.

However the duration of the electrical signal equals the duration when the laser beam is blocked. If I move my hand very fast, the signal duration will be very short.

I would like to know if there is such a circuit that could detect the rising edge of the laser signal and hold it for a while. For example, I would like to make a short 0.1ms 5V signal(something like a spike on the oscilloscope)into a longer 1ms 5V signal.

Please advise.
cheers


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