Hi guys.
I'm trying to build a basic tripwire circuit to trigger a camera flash.
The attachment above is what i have come up with after browsing some older threads.
I just need a little help to calculate the current and resistance where needed.
The phototransistor i am using shows 5k resistance in average light and drops to 2.5k with the laser shining on it.
A potentiometer would prob be a good idea also i guess.
photo transistor-http://www.jaycar.com.au/products_uploaded/ZD1950.pdf
opto-coupler-http://www.jaycar.com.au/products_uploaded/ZD1950.pdf
I'm trying to build a basic tripwire circuit to trigger a camera flash.
The attachment above is what i have come up with after browsing some older threads.
I just need a little help to calculate the current and resistance where needed.
The phototransistor i am using shows 5k resistance in average light and drops to 2.5k with the laser shining on it.
A potentiometer would prob be a good idea also i guess.
photo transistor-http://www.jaycar.com.au/products_uploaded/ZD1950.pdf
opto-coupler-http://www.jaycar.com.au/products_uploaded/ZD1950.pdf
