Technical > Wiring & Sensors
TIM rev counter
tom70:
Does anyone know if the TIM rev counter need a 5v or 12v pull up for the rev signal ?
My rev counter didn't come with an instruction.
Cheers
rob@vems.co.uk:
Is it meant to be connected to the coil '-' ?
If so 12v will be okay. I'd take a 1K resistor inline with the tacho signal in, and bounce the open end off the + terminal of the battery.
I can't understand why the diodes arent giving the right signal for you?
dnb:
If it's supposed to go to a coil -ve, then the counter may well be expecting a high voltage (ie 350v or more) signal caused as the magnetic field breaks down. In this case, the voltage must be duplicated with an inductive pullup - naturally, diode protection should be used to protect the ECU.
rob@vems.co.uk:
In that case the 18V zener diode is reducing the voltage too much for the rev counter.
tom70:
Thanks for the help here.
I have no idea why the diode don't work, the rev counter is just not responding.
Talking about pull up, which of the following connection is correct?
Option 1:
Option 2:
Sorry about my lack of electronic understanding.
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