Electronics > Beginners
Will this work (optocoupler over shunt)?
stenespen:
See attachment.
Trying to detect broken lamps in a simple circuit.
Will this work?
--- End quote ---
Benta:
No.
Lots of things wrong:
CNY17 LED voltage drop
CNY17 CTR
CNY17 max.output current
...
stenespen:
Which optocoupler should I choose?
HB9EVI:
no optocoupler will do that; they use infrared led, which actually have quite a low forward voltage, but not low enough for a shunt drop voltage, additionally it will need a considerable amount of current to drive the led, so no way.
the common way is to amplify a shunt voltage to a level easier to operate with.
the maximal current of the phototransistor also has to be taken into consideration; the magic word also here: amplifying
jmelson:
Yes, I have used this to detect overcurrent in a servo amplifier.
Jon
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