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Circuits designed by David Johnson, P.E.
Last Updated on:
Thursday, March 22, 2012 07:45 AM
Master Category List
- Dave's Circuits
Text & Graphics
Copyright © David A. Johnson, PE - ALL Rights Reserved.
LINKING to Dave's circuits is permitted but DO NOT COPY to your WEB SITE server! |
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One Shot
Circuits
(Monostable) |
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Accurate
One Shot Pulse Generator
This timer circuit draws only 3ua of current, and can be powered by DC
supplies ranging from 3v to 15v. The circuit produces accurate pulses
whose time can easily be adjusted, based on the R1 x C1 time constant.
The time should not change, even as the supply voltage varies. With the
components shown, the circuit generates a one second pulse, triggered by a
short positive pulse at the input. The circuit uses a CD4013 flip/flop
and a TLV3701 voltage comparator. Unlike a classic 555 timer circuit,
this circuit draws a hundred times less current.
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- Delayed Pulse
Generator
This circuit generates a short 10ms pulse 15 minutes after a “start” pushbutton
switch is activated.
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- PUSHBUTTON ONESHOT AND
LATCH
This circuit uses a single IC to convert a noisy pushbutton switch signal into a
clean pulse or a sustained push on-push off signal. It can operate from 3v to 18v.
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- D-FLIP/FLOP ONE SHOT
CIRCUITS
Yes you can use cheap D flip/flop logic circuits as nice one-shot pulse generators.
This schematic shows how the popular CD4013 and the CD74HC74 can be used to generate
pulses ranging from nanoseconds to seconds.
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