Use the timer to judgment the quality performance of photoelectric couplers

Published:2011/5/22 7:27:00 Author:Crystal Liu | Keyword: quality performance of photoelectric couplers, timer | From:SeekIC

NE555 adopted the circuit shows in figure 1 below,VD1 and VD2 role is sepatating capacitance C1 charge-discharge loop,in order to make the timer output 390v adjustable pulse waveform;C2isfilter capacitance,capacity is 0.01uF,Its role is comprised of timing devices;Resistance of R1,R2 respectively is 10kΩ and 51kΩ;The resistance of Rp is 0—10kΩ;The resistance of R3 and R4 respectively is 2kΩ and 1kΩ.Their action all is for the current limit;Vcc can use dry cell or dc voltage stabilizer.



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