These devices are cheap and often included if you buy a light-stand or umbrella on ebay.
They have a number of problems that I am trying to solve by modifying it:
- The light-sensor can't be switched off, so this thing flashes when other prople then you try to take a photo with a flash. => I'll add a switch for that.
- You can't control the brightness. => I'm trying to come up with a way to do that. Have to talk with some people on how to do this.
- Your equaly cheap RF receiver will dangle off the side => I'm trying to include the PCB of these wireless flash triggers into the case and add a hot-shoe to the case in the process.
The PCB seems to be well labeled and the parts trivial to identify and large enough to solder.
I just need to be careful about all the traces that carry 230V.
(click to see the other photos) Looks like 130V AC is fed through diodes and a 0,2KOhm resistor (left side on this photo) labeled "200RJ" and "10 Watt" into 3x 275V 220uF capacitors. I guess replacing that giant resistor with a variable one that I can control with a knob could allow me to reduce the power in the capacitors and thus the power of the flash.