Tachometer

Here 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.

Volt battery, which added a resistor in series as current limiter, if the voltage was increased by a change of greater value. In the case of version 2, that is true is the same plot, with the difference here is that we followed the use of a reed switch (this component has not been tested), this component is a magnetic switch (their contacts are magnetized ), Which comes in one glass ampoule, when it comes to a magnetic field, which can be a magnet or on electrimán, his contacts are closed (normally open contacts come with - normal closed), and completes the circuit. This version could experiment with a motor or something to turn to determine the approximate number ofrevolutions.

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
Capacitors:
C1: 100 nF. 25 volts
C2: 10 nF 25 volts
D1-D2: 1N1N914.
Z1: Zener Diode of .5 W, 9.1 volt
IC1: 5555
Resistors:
All of a 1 / 4 watt 10% of tolerance
R1: 47k Ω
R2: 27K Ω
R3: 270 ohms
R4: 4.7K Ω
R5: 33K Ω(can vary depending on your needs)
Pot.: 10K Ω(potentiometer)
M1: miliamperímetro 10 or 200 mA. 1 reed switch if you like esperimentar with version 2

pcb expensive components print

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