Hi,
I want to build a monostable which stays in its unstable state (for examples sake) for 100ms, but can be triggered as frequently as every 120ms (that is to say, if it was consistently triggered every 120ms, the output would be periodic and high for 100ms and low for 20ms.) The reason I want to use a monostable is because I require the high time to be known and fixed, however the frequency of the triggering (and hence the off time) is unpredictable.
The issue I am having is all the Monostable circuits I have found must recharge a capacitor before the output can be retriggered, and this recharging actually takes longer than the time the output remains unstable. I have not found any Monostables that could achieve an output duty cycle of 50% or ideally even greater.
Are monostables with a fast retrigger possible? Does anyone know of any example circuits?
Cheers,
Mitch