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One Shot / Monostable Circuits
Last Updated on:  04/22/2008 04:12:18 PM

Circuits Designed by Dave Johnson, P.E. :
  • 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. (added 12/04)
  • Delayed Pulse Generator
    This circuit generates a short 10ms pulse 15 minutes after a “start” pushbutton switch is activated. 
    (added 12/04)
  • 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.

Links to electronic circuits, schematics, or diagrams for engineers, hobbyists, students & inventors:

µC-based one-shot has wide range :  06/19/97 EDN-Design Ideas / (added 6/06) 

555 One Shot:  Basic555 MonoStable Multivibrator (added 5/02)

555 Timer MonoStable Circuit using Pushbutton:  (electronic (schematic / circuit added 4/02)

AN-296: Build a Single-Shot Recorder to Catch Fast Transients:  AN-296 Analog Devices Application Notes  (app note added 6/06)

Astable Multivibrator 1:  (electronic (schematic / circuit added 4/02)

Astable Multivibrator 2:  (electronic circuit added 7/03)

Basic 555 Monostable:  (electronic circuit added 7/03)

Basic IC MonoStable Multivibrator:  LM555 circuit added 11/06)

Build a Single-Shot Recorder to Catch Fast Transients:  AN-296 Analog Devices Application Notes  (app note added 6/06)

Circuit forms adjustable Bipolar clamp:  11/22/01 EDN Design Ideas  /  (added 1/05)  The easy way to clamp a signal to a given value is to use two zener diodes, connected back-to-back. This method has several disadvantages. The accuracy of the clamping depends on the tolerance of the zener diodes, and the clamping is not adjustable, except by changing diodes. The circuit in Figure 1 is a bipolar clamper with a range of 1 to 10V, with the clamping level a fun... ...

Circuit forms clockless Programmable one-shot:  04/24/97 EDN-Design Ideas  / (added 2/06)   

Controller IC and one shot form resonant Controller:  11/28/02 EDN Design Ideas  /  (added 1/05)  Resonant power supplies are popular because of high efficiency, low noise, and compactness. You can implement a resonant buck or boost converter using a single switch. The regulation of the output in such a converter derives from using a constant on or off time and a variable frequency. The UC1864 controller IC (Texas Instruments, www....

Delay line aids in one-shot simulations:  04/26/01 EDN-Design Ideas  / (added 2/06)   

Dual One Shot Makes Rising and Falling Edge Detector:  03/04/99 EDN-Design Ideas / (added 6/03) The design in Figure 1 is an upgradded version of the circuit in a previous Design Idea (" Edge detector runs off single supply ," EDN, Dec 4, 1997, pg 140). It has fewer components, draws less current, and has higher input impedance. The circuit uses a 4098 dual monostable multivibrator with both sections connected. ....

MonoStable Flip Flops (One Shot):  (electronic (schematic / circuit added 4/02)

Monostable Makes Low Cost F/ Volt Converter:  02/18/99 EDN-Design Ideas / (added 6/03) The circuit in Figure 1 is a low-cost frequency-to-voltage (F/V) converter. Using a monostable (one-shot) multivibrator, the circuit accepts an open-collector square wave that varies in frequency from 0 to 10 kHz. The one-shot produces a pulse of a fixed width each time the input signal triggers it. The result is a variable-frequency, variable-duty-cycle signal at the output of the one-shot. The time constant determined by R2C1, 100 µsec, determines the width of the pulses the one-shot produces. This time matches the period of the maximum input frequency (10 kHz). The duty cycle of the one-shot's output is thus 100% when the input is at its maximum frequency....

Monostable Mode Operation (One Shot Pulse):  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

Monostable Multivibrator:  (electronic circuit added 7/03)

One shot circuit is Programmable:  12/21/00 EDN-Design Ideas / (added 4/02) / PDF contains multiple circuits scroll to find this circuit

One shot provides frequency discrimination:  05/01/03 EDN Design Ideas  /  (added 1/05)  You use a frequency discriminator to compare one signal frequency with another one. A functional feature, retriggering, of a monostable, one-shot 74xx123 multivibrator can yield frequency discrimination. Figure 1 shows a frequency discriminator that determines the relation of input-pulse frequency to a reference frequency....

One Shot Remembers Input Pulse Width:  07/18/96  EDN-Design Ideas  / (added 3/03)    

Quad Monostable Mode Operation (One Shot Pulse):  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

Repeating One Shot yields Clean Stable Pulses:  12/08/94 EDN-Design Ideas / (added 3/03) Now and then, you need a repeating one-shot, such as a multi-shot. For example, when an input logic signal or alarm condition occurs, you may need an immediate pulse to provoke a sequence that eventually resets the condition. But, if the resetting fails, you need to keep generating pulses until the message gets through. If you give up sending pulses, something as important as an entire space mission could have to wait for an automatic reset....  

Slow OpAmp Makes Fast Multivibrator:  01/01/98 EDN-Design Ideas / (added 3/03)  

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