Fellow AAC folks,

I'm looking for an idea how to demux a square signal to two output without using a demux IC.

Input1: a 5V high or low Z (I can opamp it if needed), square signal, variable frequency (10Hz to 1kHz).
Input2: a 3V3 high Z GPIO (which is the selector for output 1 or output 2).

I was thinking to use a transistor to pull the signal down. I could use an opamp to reverse Input2 and so it pulls down on one output or on the other one.

Anyone got a better idea? (I have no logic ICs, that would be easy to solve with some gates).

 

Depends on what the signals are for. Got a better description?

ak

 

Sorry, forgot to specify, output1 and 2 are going to a TTL IC, a binary counter.

 

Mileage may vary.

 

@MrChips, interesting design, love it, so simple. I will adapt R1/R2 to what suits best. I just have a little concern, my IC low input has a threshold of 0.8V. While it should work, it's a bit tight. I'll give it a try and let you know.

 

Driving TTL, R1 and R2 must be below 470 ohms, and D1 and D2 should be Shottkeys.

ak