The o / p of the I _ V converter needs to go to some sort of Schmitt trigger circuit with its threshold set to the equivalent of your desired photodiode current.
12.
When only the PC terminal is used and the hotshoe remains un-populated, a flash with high trigger circuit voltages connected to the PC terminal delivers this voltage on the normally unprotected middle contact of the camera's ISO hotshoe.
13.
While the most common problem adapting flash equipment to cameras is an excessive trigger voltage, sometimes the trigger circuit voltages provided by some modern flashes or radio triggers can also be too low to ensure that the electronic triggering circuits in the camera or receiver can still reliable trigger it.
14.
The camera will only " see " the low voltage provided by the local trigger unit necessary in order to detect the camera's trigger impulse, and the remote receiver unit will handle up to 200 volts from its flash port, thus isolating the camera from the flash's high voltage trigger circuit.
15.
Since multiple Schmitt trigger circuits can be provided by a single integrated circuit ( e . g . the 4000 series CMOS device type 40106 contains 6 of them ), a spare section of the IC can be quickly pressed into service as a simple and reliable oscillator with only two external components.
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