Could someone clever help me out.
I have a 5Vdc signal which needs to switch 24Vdc and two 24Vdc signals that need to switch 5V using an optoisolator.
The circuit is designed around the 4N33 and although I have read the datasheet and produced the test circuit in the datasheet, I cant seem to get it to switch.
The 5Vdc feeds the input and 24V is connected to the collector via a 1K resistor, this should produce around 24mA which I feel is too small, so the resistor was changed to 370Ohm to produce around 60mA, but still no joy.
Ideally it would be great to be able to have an external LED on both the input and output stages to ensure that those signals are present as a visual aid.
Can anyone offer some advice?
Thanks so much in advance.
Sly
I have a 5Vdc signal which needs to switch 24Vdc and two 24Vdc signals that need to switch 5V using an optoisolator.
The circuit is designed around the 4N33 and although I have read the datasheet and produced the test circuit in the datasheet, I cant seem to get it to switch.
The 5Vdc feeds the input and 24V is connected to the collector via a 1K resistor, this should produce around 24mA which I feel is too small, so the resistor was changed to 370Ohm to produce around 60mA, but still no joy.
Ideally it would be great to be able to have an external LED on both the input and output stages to ensure that those signals are present as a visual aid.
Can anyone offer some advice?
Thanks so much in advance.
Sly