Homemade safesync

Posted this circuit a good while ago and promised some pictures. Better late than never eh? . I have used this for around 18 months now without issue. Total cost was £24.

Hey, and it even has a PC connection of the "Nikon Screwlock" flavor.

See those threads on the inside of the outer collar on the PC port.

Where did you get the basic hotshoe adapter that you used for the conversion (brand, type, etc).

Enjoy! Lon

londuck wrote in post #2627835
Hey, and it even has a PC connection of the "Nikon Screwlock" flavor.

See those threads on the inside of the outer collar on the PC port.

Where did you get the basic hotshoe adapter that you used for the conversion (brand, type, etc).

Enjoy! Lon

Hotshoe adapter is a Canon hotshoe adapter, unsure of model, bought on ebay for £8.

b1gdaddy wrote in post #2628302
Hotshoe adapter is a Canon hotshoe adapter, unsure of model, bought on ebay for £8.

Would your circuit work with 4.8 Volts also (4 NiMH cells already in many flash units) in addition to the about 6 Volts (4 alkaline cells)?

Also, would this design be tolerant of all range of incoming trigger Voltages, such as above 350 Volts for old Vivitar 283's down to common Voltages just above 6 Volts?

My idea would be to actually sneak the circuit inside the flash unit and wire the output to the hotshoe and any sync port (and steal power from the cells that are already there).

Enjoy! Lon

Yes. just power the circuit from the flashguns batteries. Circuit operates from 2v to 9v. I have used it on several guns with trigger voltages as high as 380v (vivitar 285) but use it mainly with a sunpak AZ3600 @ 300v.

b1gdaddy wrote in post #2979807
Yes. just power the circuit from the flashguns batteries. Circuit operates from 2v to 9v. I have used it on several guns with trigger voltages as high as 380v (vivitar 285) but use it mainly with a sunpak AZ3600 @ 300v.

Thanks.

So, I may be able to finally tame some of the 300+ Volt sync Votage Vivitar 283 units lurking, and have them intrinsically safe for all cameras.

Cannot get to this right away, and possible not for some time, but I will give it a try at some point.

Without the need for a small battery I suspect I can get those extra components inside a Vivitar 283.

Enjoy! Lon

Seeing as you've used it in your mod I might as well borrow this thread to ask this; Where can I find a screwlock connector? I just want the actual adapter/connection. I've searched here and eBay as well as a few sites like B&H and whatnot. Anybody got a tip?