Loublet Schematic

This digital SP 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 schema 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 schema 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 schema U1/U2 resets the counters.

Since batteries are used to power the schema, its not sensible to support the continual show of speed data. This schema isnt continuously active. The schema is activated solely once a button is pressed. a minimum of 3 permanent magnets should be put in on the wheel. The schema are often calibrated with the assistance of another pre-calibrated tachometer.

Author: alen mark Sourced by: diagramstream