Connect with us

Opto coupler

Discussion in 'Electronic Basics' started by lerameur, Jan 25, 2007.

Scroll to continue with content
  1. lerameur

    lerameur Guest

    hello,

    I have bought the MCT6 chip (opto coupler)
    I grounded pin 3 and 5

    If I put a voltage a cross pin 4 should I get the same voltage across
    pin 6 ??
    I am not getting anything

    k
     
  2. lerameur

    lerameur Guest

    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
     
  3. John Fields

    John Fields Guest

    ---
    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.
     
  4. lerameur

    lerameur Guest

    Thanks JF
    This is a similar circuit found on one spec sheet.
    I took a snapshop of the circuit and posted here:
    http://www3.sympatico.ca/lerameur/

    infortunately it still not working

    ken
     
  5. Chris

    Chris Guest

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

    http://www.nteinc.com/specs/3000to3099/pdf/nte3086.pdf

    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
     
  6. lerameur

    lerameur Guest


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

    ehsjr Guest

    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
     
  8. lerameur

    lerameur Guest

    Ok great its working, thank you
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-