| Electronics > Beginners |
| Will this work (optocoupler over shunt)? |
| (1/11) > >> |
| 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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