What is the minimum forward current to ensure that the transistor will turn on in a 4N26 optocoupler? The datasheet shows that the typical forward voltage is 1.18v @ 10mA. Is 10mA enough?
What's the difference between Sample A and Sample B?
If I'm getting this, then based on Sample A, a forward led current of 10mA will "bias" the transistor just enough to pass slightly more than 10mA? Not sure if "bias" is the right word?
I was thinking of using the 4N26 as a switch on the output of a monostable 555 circuit. The output will be used to close the shutter of a digital camera. Do I need to measure the voltage drop when the camera's switch is open and the current when it's closed?
The difference between Sample A and Sample B is the difference in specifications that can will happen during the production.
If you want to have a optocoupler that fuctions with higher tranfer gain, take a look at the SFH620A - 3.