A simple circuit to produce random gates output. The 555 timer control the time at which the output is giving random gates (or random pulse width square wave I should say). The all circuit is quite self-explanatory I think. The pot. associated with the comparator isn’t very necessary but add some wellcomed variations.

It isn’t mentioned but the random noise coming to the comparated must be massively filtered (at least under 5Hz). Ideally a varaible filter could also be nice addition (although its span has to be large to get a decent scale).

R41/R43 form a voltage divider to output (about) a 10V high level. Maybe 12V is deadly enough for some module’s input.

The circuit works good and will be added to a coming “noise oriented” module.


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