Opto coupler

I also put pin 6 to Vcc and a resistor to pin 5 to ground, and take the voltage at pin 5 , but no luck either

k

--- That's because you're hooking it up wrong.

You should be doing it like this: (View in Courier)

+5V>-+-------------+ | | +--> | | S1 | | O | | | [360R] [2K5] | | | +------>VOUT |3 |5 +--|--------|--+ | | | | | | C | |[LED]--> B | | | E | | | OPTO | | +--|--------|--+ |4 |6 GND>------+--------+------>GND

Or like this:

+5V>-+-------------+ | | +--> | | S1 | | O | | | [360R] | | | | | |3 |5 +--|--------|--+ | | | | | | C | |[LED]--> B | | | E | | | OPTO | | +--|--------|--+ |4 |6 | +------>VOUT | | | [10k] | | GND>------|--------+------>GND

In the first example, when S1 is open VOUT will be close to 5V and when S1 is closed VOUT will be close to 0V (0.5V or something like that).

In the second example, when S1 is open VOUT will be very close to 0V and when it's closed VOUT will be close to 5V.

-- JF

Thanks JF This is a similar circuit found on one spec sheet. I took a snapshop of the circuit and posted here:

infortunately it still not working

ken

here:

OK, lerameur. First off, you might want to look at the datasheet:

Also, your picture shows that the MCT6 collector is connected to GND through the 10K resistor, and your emitter is connected to +5V. Switch those two and it should work, unless you let out the magic smoke already.

It's always a good idea to look at the datasheet before you plug it in. ;-)

Cheers Chris

here:

might want to look at the datasheet:

I also switch the cathode and anode from the diagram shown.

here:

might want to look at the datasheet:

Right. You need to have pin 3 and pin 5 connected to ground. You need pin 6 connected to the 10K resistor - the other end of the resistor goes to (+). (Might be a 1K resistor - I can't tell if that is a red or an orange band) The other resistor connects from pin 4 to +5 volts, but I'd change it to 220 ohms.

Ed

here:

might want to look at the datasheet:

to have pin 3 and pin 5 connected to ground.

Ok great its working, thank you