UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

TonyDuell · 21st Dec 2018, 6:11 am

Some time ago I made a 100/120 flashes/second strobe. Started from a 4.9...MHz crystal oscillator module, then 3 common 74HCT chips. Drives 4 white LEDs. I built it for setting the spindle speed on old floppy disk drives (which had a strobe disk on the spindle pulley) and it was easily good enough for that and gives one of the clearest stationary patterns I have ever seen.

Of course the 2 flash rates let me use strobe disks either intended for 50Hz or 60Hz lighting.

I can provide the circuit diagram if anyone wants it.

21st Dec 2018, 6:11 am	#3
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: More Chinese AM radio kits Some time ago I made a 100/120 flashes/second strobe. Started from a 4.9...MHz crystal oscillator module, then 3 common 74HCT chips. Drives 4 white LEDs. I built it for setting the spindle speed on old floppy disk drives (which had a strobe disk on the spindle pulley) and it was easily good enough for that and gives one of the clearest stationary patterns I have ever seen. Of course the 2 flash rates let me use strobe disks either intended for 50Hz or 60Hz lighting. I can provide the circuit diagram if anyone wants it.