TachometerHere are 2 charts for tachometers or account laps for the car or for another function that happens to you. The measurement instruments on both can be VUmetro or miliamperímetro 100 or 200 mA.
Diagram of version 1 is designed to connect the circuit to the spark of the car, in this case was placed a resitor of 33K (R5), which can vary depending on the intensity of the input signal to get a proper reading. The power is with the 12.
For both circuits will have to adjust the cover so you know that the number of revolutions has at some point, either the vehicle or other equipment being monitored.
List of components B>
C1: 100 nF. 25 volts
C2: 10 nF 25 volts
Z1: Zener Diode of .5 W, 9.1 volt
All of a 1 / 4 watt 10% of tolerance
R3: 270 ohms
M1: miliamperímetro 10 or 200 mA. 1 reed switch if you like esperimentar with version 2
pcb expensive components print
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