Oscillation coupling

A project log for Yet Another Electronic Lampyridae

and I ain't using a '555. Self-organising CMOS ring oscillators are cooler !

Yann Guidon / YGDESYann Guidon / YGDES 02/21/2016 at 18:310 Comments

My first test has not shown a significant period variation when the LDR is lit or shadowed, I wonder what is the best placement for the light-sensitive resistor. I'll have to build a few boards and test them...

OK, let's do this :-)

OK it seems I must engineer the system better. I made a 2nd circuit and they seem to naturally work at different frequencies. They appear to "read" each other when placed close but there is a weird 4:5 frequency ratio. I'm not sure if the feedback keeps the pulses in sync or prevents them, though I see they seem to lock for a cycle or two and then....

I must analyse the phase behaviour. And/or design a phase detector, or something.