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  1. Is it critical for the value of the zener diode as I can only get my hands on a 2.7v jobbie today

  2. #12
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 6 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,039. Received thanks 225 times, giving thanks to others 5 times.
    No, but a higher voltage zener will mean the potentiometer will be working a bit harder.

  3. #13
    Quote Originally Posted by AdCNC View Post
    Is it critical for the value of the zener diode as I can only get my hands on a 2.7v jobbie today
    Not really, your output voltage will be 0 - 2.7v rather than 0 - 1.5 so trimming it will be slightly more fiddly.

    I'd set it to zero and connect it up and then bring it up to the voltage you want - this will negate any effects due to the load the ECU puts on the potential divider.

  4. Ahh ok. Well thanks for your help guys I'll try and slap something together today. Cheers :)

  5. Can I ask what car this is for?

  6. It's for a Toyota Corolla Compressor

  7. Well works like a charm on the meter so now to plumb it in.
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    Last edited by AdCNC; 11-07-2013 at 10:38 PM.

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