Split from this thread:
https://www.vintage-radio.net/forum/...d.php?t=152165
All this talk of oscillators and crystals reminded me that I've still to design and build a 300Hz strobe to help with adjusting my turntable(s) speed of rotation.
I know it's slightly off-topic but thought that something might have cropped in the Chinese AM radio kits arena - or if anyone would like to assist??