NE555 + TC4022 Digital Tsett ----- NE555 + TC4022 Speed Counter

NE555 + TC4022 Digital Tsett, Ne555 + TC4022 Speed ​​Counter Keywords: NE555, TC4022, TC4518, TC4511, Speedometer circuit diagram This is a digital tachometer based on 555. It receives the ignition pulse (200 Hz / 6000rpm) from the 4-cylinder engine, with a digital display speed. The circuit is as shown in Figure 1.555 as a time base, and the time to output it "H" pulse with VR to 0.300s. That is, the time to read the TC4518 read the ignition pulse is set to 0.300s. If you read 200 Hz (0.5s) during 0.300s, the corresponding speed of the display is 6000 rpm. Figure 2 lists the waveforms of the key points in the circuit. Be Be Figure 1. The ignition pulse input is added to two diode 1s1588 as a two-way limiting limit to avoid input over high voltage. TC4584 is a 6-inverter for built-in Schmitt trigger circuit, one of which is pulsed on the input. TC4518 is a dual BCD a counter, TC4511 is a BCD7 segment lock, decoded, and drive. The time baseline can also be used in crystal vibrators, but its cost is higher. It is also necessary to increase the part of the division IC.

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