I'm in the process of making my own home-made camera flash. I'm now designing the "trigger circuit" that will be using a 3.5mm jack as my preferred connection to the camera's PC sync or hot shoe.
I know that flashes's trigger voltage varies between different brands but I decided to use 5 volts for my design, as I have managed to rent a godox 300W last year and I remember that its using around 3 ~ 5 volts (yes, I measured it with a voltmeter), and this particular flash works fine on my A7R camera, so I'm good on using that voltage value.
Now, my problem is the MAX "current rating" of the PC sync / hotshoe connection of the camera. I have no idea and for whatever reason - google cannot give any definitive answer.
I asked because I will be using two different regulator ICs to step-down my battery voltage level, and the ICs are giving me two different output current rating - one is 50mA and the other is 120mA.
Will these values work fine on my A7R or with mirrorless cameras in general? Last thing I want is connecting the flash to the hotshoe and then hitting the shutter button but only to smell the magic smoke of a burnt circuit of my camera's trigger circuit.
I know that the princicples with regards to current in electronic devices - is that the Load is the one to decide whatever current amount it would draw. In this case, the camera will be the load (I assume) so the camera should be safe from getting destroyed - if the output current of 50mA or 120mA is not enough, the flash would not work.
BUT I just wanted to be sure. I don't want the added trouble of fixing my camera's trigger circuit. So for anyone who knows the current ratings of sony alpha cameras or mirrorless in general, please share your inputs. Thanks!