9XA Method

 

 

9xa demonstration, showing how two independent 9xb frequency generator's outputs were used to trigger two H11D1 optocouplers to produce a gated pulse train as shown in schematic. In this setup, I had 555's produce a 100khz output to 4 CD4017 dividers. This allowed a 10khz with 50/50 duty cycle to be achieved. LED is just for visual confirmation. If looking closely, you can see how the gating generator isn't synchronized with frequency generator. This causes extra pulses to arise during gated ON times.