SgtWookie,
the resistance of the wire i intend to use varies from 0.4 to 0.7 Ohms, and i have no idea what the output impedance of the 12v pulse signal is.
I would have to get the specs for this type of flow meter, but another similar one was around 450 pulses per litre and expected flow is between 9 and 15 litres per minute giving pulse range of 4050 - 6750 pulses per minute.
Looking at your oscilloscope, am i right in saying both your idea and that of rjenkins give similar results. But would i also be right in saying that if the 12vdc wavered, prehaps a spike from starting the tractor, your design would give more protection?
the resistance of the wire i intend to use varies from 0.4 to 0.7 Ohms, and i have no idea what the output impedance of the 12v pulse signal is.
I would have to get the specs for this type of flow meter, but another similar one was around 450 pulses per litre and expected flow is between 9 and 15 litres per minute giving pulse range of 4050 - 6750 pulses per minute.
Looking at your oscilloscope, am i right in saying both your idea and that of rjenkins give similar results. But would i also be right in saying that if the 12vdc wavered, prehaps a spike from starting the tractor, your design would give more protection?