one shot circuit
Hi,
I am trying to build a one shot circuit with NE555 timer IC, my requirement is when the trigger pin shorted to ground, the output should provide a short delay switch to logic high then back to logic low. However, according to my experiment, it shows that if the trigger input after shorted to ground, the output with keep to logic high until the input (trigger) pin disconnect for the ground. Please suggest if any NE556 connection circuit or any other simple circuit can fulfill my requirement. Regards Victor |
"KK" wrote in message ... Hi, I am trying to build a one shot circuit with NE555 timer IC, my requirement is when the trigger pin shorted to ground, the output should provide a short delay switch to logic high then back to logic low. However, according to my experiment, it shows that if the trigger input after shorted to ground, the output with keep to logic high until the input (trigger) pin disconnect for the ground. Please suggest if any NE556 connection circuit or any other simple circuit can fulfill my requirement. Regards Victor Have the switch ac coupled to the input of the 555. Or, you could use a one-shot, like a 74LS123. Brian |
invert the trigger input
Brooks KK wrote: Hi, I am trying to build a one shot circuit with NE555 timer IC, my requirement is when the trigger pin shorted to ground, the output should provide a short delay switch to logic high then back to logic low. However, according to my experiment, it shows that if the trigger input after shorted to ground, the output with keep to logic high until the input (trigger) pin disconnect for the ground. Please suggest if any NE556 connection circuit or any other simple circuit can fulfill my requirement. Regards Victor |
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