LED Timing Circuit with Single Gate

MisterBill2

Joined Jan 23, 2018
18,176
THanks for the reply, I'll be reading it with an IR receiver so not worried about seeing it, just about saving power by keeping the pulse short.
OK, so the reason for keeping the pulse short is battery conservation, not some precise time requirement. That makes the solution simpler and much less critical.
 

Ian0

Joined Aug 7, 2020
9,668
This is how a 4069 behaves when the input voltage approaches mid-supply.
There's no equivalent graph in the 4049 datasheet. Do you think it behaves differently?
I'm assuming you're using the classic 2-gate CMOS oscillator, as a single 4049 won't oscillate, having no hysteresis.
 

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