Hey I'm actually designing a comparator circuit |--------feedback resistor------| | | | |---------------------| | RC CIRCUIT ----|------|+ | | | COMPARATOR CIRCUIT | | INPUT----------|- |--|---------OUT |---------------------| The task is to design this cirucit in such a way that when an input pulse (0.5,-2.5) with a pulse width of 8micro seconds is given it should produce me an output which remains high for atleast like 64micro seconds..i tried using R=2248.5k and C=8500pF and the feedback resistor i used was 90k..i was able to get an o/p which remains high for 64microseconds but when looked at it carefuly i was able to figure out that the outout remained high just beacuse of the large difference between the resistors(the storage capacitance is not much observed in the o/p graph)...it should basically work like a monostable multivibrator (without using ic 555 timer though)...it would be of great help to me if u could give me some suggestions as how could i do this.. thanks sk
Homework or not, I needed a rest from programming a damned PIC and as a starter, suggest this ... Should give a -repeatable- timed pulse of about 65uS. +5V +5V +5V +5V +5V +5V | | | | | | .-. | --- .-. | | | | | --- | | | | | |1k | 1n| | | | .-. '-' | | '-'10k | | | || | ___ |< | | | | |1k o--||--o-|___|--| BC556 | | | '-' IN || 10k |\ | | |\| | o 1n | | o----|-\ | | | | | | >--o---o | '------o----------|+/ OUT | | | |/|LM393 o | | | | | | .-. .-. | | | | | | | | | | | | | | | | | 56k'-' '-'6k8 | | === | | | | GND === === === === GND GND GND GND (created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)
