Tag: Tachometer

Variable reluctance magnetic is not derive all inputs. For example in spark ignition engines, the inputs are derived from the spark coil. Below is figure of an interface circuit for this situation. We can set up any number of cylinders using this tachometer by linking the appropriate timing resistor as illustrated. We can use a 500ohm trim resistor to set […]

Pulses are received by the timer from the distributor points. When the timer output is high, Meter M receives a calibrated current through R6. The meter don’t receives any current for that part of the duty cycle after time-out. A visible indication of engine speed is provided by integration of the variable duty cycle by the meter movement. Here’s the […]