Electronics Circuit Diagram

In a car, a tachometer is designed to measure the speed or rotations per minute of a rotating shaft. Below schematic depicts the design of a Simple Wireless Car Tachometer Circuit to be used for measuring car’s engine speed.

Simple Wireless Car Tachometer Circuit – Components and Parts List:

R1, R2, R9 _____ 1K 1/2 W Resistor   
R3 ___________ 47K 1/2 W Resistor   
R4 ___________ 10K 1/2 W Resistor   
R5, R6 ________ 25K Trim Pot   
R7 ___________ 10K Trim Pot   
R8 ___________ 200 Ohm 2 W Resistor   
R10 __________ 15K 1/2 W Resistor   
R11 __________ 2.2K 1/2 W Resistor
C1 ___________ 0.47uF Capacitor   
C2 ___________ 47uF Electrolytic Capacitor   
D1 ___________ 8V 1W Zener Diode   
D2, D3, D4 _____ 1N914 Diode   
M1 ___________ 200uA Meter   
Q1, Q2 _______ 2N3391A Transistor
S2 ___________ Three Position Single Pole Rotary Switch   

Other components:
Telescoping Radio Antenna
Enclosure
Power Cable and Battery Connector

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