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One Shot / Monostable Circuits    Page 1
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Last Updated on: Thursday, October 30, 2014 09:22 AM


Circuits Designed by Dave Johnson, P.E. :

  • 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.
  • 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)


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
µC-based one-shot has wide range -  06/19/97 EDN-Design Ideas....The µC-based, digitally programmable, monostable multivibrator in Figure 1 has more accurate timing than a conventional RC-based device because a 20-MHz crystal controls the µC. The PIC16C54 is a low-cost, high-speed,.... [Design Idea by Yongping Xia, International Teldata Corp, Los Angeles, CA]
555 Monostable -  Use of the ubiquitous 555 timer in monostable mode….(schematic designed by Andy Collison added 8/03)
555 Monostable Circuit -  Basic circuits and information about this timer/oscillator. Scroll to find the 555 Monostable Circuit. (11/06)
555 One Shot -  Basic555 MonoStable Multivibrator … [Tony van Roon's circuit]
555 Timer MonoStable Circuit using Pushbutton -  The two circuits above illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button. The circuit on the left can be used for long time periods where the push button can be pressed and released before the end of the timing period. For shorter periods,.... [Bill Bowden's website]
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....[Designed by David A. Johnson]
Adjustable Timer -  This circuit starts timing when switched on. A green LED lights to show that timing is in progress. When the time period is over the green LED turns off, a red LED turns on and a bleeper sounds. The time period is set by a variable resistor and it can be adjusted from 1 to 10 minutes (approximately). It could be used to set a time limit when playing games or as an egg-timer in the kitchen.... [Designed by John Hewes]
AN-296: Build a Single-Shot Recorder to Catch Fast Transients -  AN-296 Analog Devices Application Notes....[App Note]
Astable Flip Flop Circuits (techlib) -  Several circuits here.  The familiar astable flip-flop circuit is a handy configuration for making flashers or generating squarewaves. Here is a typical alternating LED flasher with the LEDs in the emitters instead of collectors as is normally done. The bias resistors are directly connected....(added 04/05/06)
Basic 555 Monostable -  Use of the ubiquitous 555 timer in monostable mode….(electronic circuit designed by Andy Collison added 7/03)
Basic IC MonoStable Multivibrator -  Schematic only, no circuit description included…. [Tony van Roon's circuit]
Build a Single-Shot Recorder to Catch Fast Transients -  AN-296 Analog Devices Application Notes....[App Note]
Circuit adds functions to a monostable multivibrator -  7-Aug-08 Issue of EDN  Adding an oscillator and counters to a monostable multivibrator allows you to generate multiple gate outputs from a single input pulse.... [Design Idea by PM Ishtiaq, S Mufti, MA Darzi, and GN Shah, Nuclear Research Laboratory, Bhabha Atomic Research Centre, Kashmir, India]
Circuit forms adjustable bipolar clamp -  22-Nov-01 Issue of EDN  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.... [Design Idea by Pautasso Luciano, Nichelino, Italy]
Circuit forms clockless Programmable one-shot -  04/24/97 EDN-Design Ideas.... EDN is migrating links. This link is not verified.  Search the "title" EDN for new link.
Controller IC and one-shot form resonant controller -  28-Nov-02 Issue of EDN  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.... [Design Idea by C Rajan, Centre for Advanced Technology, Indore, India]
Delay Line Aids in One-shot Simulations -  02/05/04 EDN-Design Ideas....In low-noise analog circuits, a high-gain amplifier serves at the input to increase the SNR. The input signal level determines the input-stage gain; low-level signals require the highest gain. It is also standard practice in low-noise analog-signal processing to make the circuit's bandwidth as narrow as possible to pass only the useful input-signal spectrum. (added 10/05] EDN is migrating links. This link is not verified.  Google the "title" EDN for new link.
Delayed Pulse Generator -  This circuit generates a short 10ms pulse 15 minutes after a “start” pushbutton switch is activated.... [Designed by David A. Johnson]
D-Flip/Flop One Shot Circuit -  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. …. [Designed by David A. Johnson]
Dual one-shot makes rising and falling edge detector -  03/04/99 Issue of EDN  The design in Figure 1 is an upgraded 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....Page includes several designs.  Scroll to find this one.... [Design Idea by Santo Camonita, Catania, Italy]

One Shot / Monostable Circuits:  #'s - D       E - N      O - Z


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