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C. When the transistor is on, collector voltage goes to ground. When off, the voltage is to the rail, through the 1k ohm resistor. This resistor value is based on the impedance of the tachometer.

The ESS generates a low voltage alternating current, one pin goes to ground, the other is the input to this circuit. Doesn't matter which, this is alternating current so they interchange. The transistor has 3 connections, B, C and E. Base, collector and emitter. They are labeled on the diagram.

To further the circuit explanation, the sawtooth wave varies from V+ to V- with a frequency dependent on engine speed. There are points in time where it crosses zero volts and then becomes negative. The resistor pair, 220 and 15 k ohm resistors are in series with the 13 volt DC input. When...

The ESS signal is an alternating current sine wave, frequency dependent on engine speed. This circuit first changes this sine wave to a sawtooth wave using the capacitor. This is then compared to the steady state 13 volt direct current using the two resistors. When this voltage crosses zero...

If your goal is a better signal, what is bad about the alternator tap? Belt drive? The Dakota Digital interface has great range of calibration. Since the alternator is spinning much faster than the crank, the sampling frequency is much higher than say a gear tooth Hall Effect sensor on the...

What is the difference? Tachometer is an engine speed sensor. Most aftermarket or speed shop tachometer work off a square wave signal as that is what was common on breaker point ignition. The pictured part uses a rotating magnet to induce alternating current output with a frequency...

GM part for California vehicles. There is a chapter in the book "The 6.2L Diesel Engine" published by the Diesel Page . Dr Lee Swanger wrote the chapter. This engine speed sensor on top of the vacuum pump generates a variable frequency alternating current. The circuit diagram first...