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Re: Tacho signal amplification |
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Just popping in
Joined:
2004/3/16 1:42
From Mt Isa
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Registered Users
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Scotty,
The stinger EMS has what is called "Open Collector" outputs, this is a way you can use pairs of transistors to switch things on and off. The key in getting it all to work properley is that the device you are switching "ie. Your Tach Pulse" must be connected between 12V and the switch wire on the EMS.
Most guage manfacturers use a high impedance input so as not to load any normal ignition system when connected. This is what I feel will be causing your probs as it doesn't provide an acceptable collector load for the transistor array inside the EMS.
Similar to the EMS solution I have had sucess in the past by using a higher value resistor about 10K ohm between 12V and the Tach pulse output on the EMS, this resistor becomes the load and allows the transistor to switch.
If this doesn't work I can build an OP Amp or PIC based device to do the job but the resistor has worked for me many times.
Let me know
Posted on: 2004/4/22 19:54
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