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RobertMacy RobertMacy is offline
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Default "Random" Circuit Needed.

On Wed, 01 Apr 2015 12:08:34 -0700, Jim Thompson


"For a simulation situation..." ;-)

John F and Lasse have provided how to do it.

...Jim Thompson

For simulation I'd use the built-in rand() function of LTspice, if you
want gaussian instead of uniform distribution, use five rand()'s summed
appropriately. You said you like to use PSpice only, so create a text file
to use in a PWL type thingy THEN you can get completel control, likw
distribution and the elusive 1/f etc, any type statistics you want.

For Hardware to not have to go buy much, use the Soundcard and run it
directly with either a repeating pattern of random values, or from a
random number generator to get very long runs. The method of converting
FROM the audio output [BW is 10Hz to approx 100kHz] is left to the
'student'] The point here is that you can get repeatable random sequences
that are completely under your control.