I just now put together a simple pulser using a LMC555 in order to be able to troubleshoot a fast charge sensitive ampllifier at work (it's warm there, as opposed to my workshop) without having to get my hands on a pulse/function generator (in short supply). The circuit was thrown together on a piece of perf board in about 20minutes, and puts out beautiful double exponential pulses of 2V height and ~20-30nsec rise time, ~70-80 nsec tail time.
The key to success is using a CMOS 555, which has faster edges than the original bipolar 555, and throws a lot less noise back into the power supply. I'll post a schematic and waveforms when I get a little more time.
Simple Diagnostic Pulser
Re: Simple Diagnostic Pulser
I love The smell of COMOS in the morning.
Larry Leins
Physics Teacher
Larry Leins
Physics Teacher
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Re: Simple Diagnostic Pulser
As promised, in the files section is a file containing 2 simple CMOS pulser circuits with output waveforms, and output waveforms of a fast charge sensitive amplifier when driven with each pulser. Double the smell....
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Re: Simple Diagnostic Pulser
Looks like a good project for Sunday afternoon. Thanks Richard.
Jon Rosenstiel
Jon Rosenstiel
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Re: Simple Diagnostic Pulser
Thanks for the post, Richard, you may recall that I spent a lot of time trying to make a working pulse generator from a 555 timer and never could get it to work, (noise problems).
Tom Dressel
Tom Dressel