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This is the simple tachometer for bikes uses 2 reed switches to urge the speed data of the bicycle. The reed switches are put in close to the rim of the wheel where permanent magnets pass by. The permanent magnets are connected to the wheelspokes and activate the reed switches everytime they pass by it. The speed is digitally displayed. The tachometer circuit works in step with this principle; the pulses created by the reed contacts are counted inside an explicit time interval. The ensuing count is then displayed and represents the speed of the bike. 2 4026 ICs are used to count the pulses, decode the counter and management 2 7-segment LED show. RS flip-flops U3 and U4 perform as anti-bounce. Electronic bicycle SP tachometer circuit diagram The pulses arrive at the counter’s input through gate U7. The measuring amount is set by monostable multivibrator U5/U6 and might be adjusted through potentiometer P1 so the tacho are often calibrated. The circuit U1/U2 resets the counters. Since ba...

Simple gasoline engine tachometer circuit diagram is the simple project for hobbyist and students,  Gasoline Engine Tachometers. For gasoline engine measurement applications. For gasoline/diesel engines and general rotating objects.This tachometer can be set up for any number of cylinders by linking the appropriate timing resistor as illustrated.     Simple Gasoline Engine Tachometer Circuit Diagram     A 500 ohm trim resistor can be used to set up final calibration. A protection circuit composed of a 10 ohm resistor and a zener diode is also shown as a safety precaution against the transients which are to be found in automobiles. If you like this project share your affordable comments leave below for us.