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One Shot / Monostable Circuits
#'s - F       G - Z
 

Last Updated: October 18, 2017 05:04 AM

Circuits Designed by Dave Johnson, P.E. :

1 Second One Shot Circuit - 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, . . . Hobby Circuit designed by David Johnson P.E.-September, 2010

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,. . . Circuit by Dave Johnson P.E.-September, 2010

Delayed Pulse Generator - This circuit generates a short 10ms pulse 15 minutes after a “start” pushbutton switch is activated. . . Circuit by David A. Johnson P.E.-October, 2005

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. . . Circuit by Dave Johnson P.E.-June, 2000


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, __ Circuit Design by Yongping Xia, International Teldata Corp, Los Angeles, CA

1 Second One Shot Circuit -  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, . . . Hobby Circuit designed by David Johnson P.E.-September, 2010

1-shot is programmable -  12/21/01  EDN-Design Ideas - Figure 1 shows how to digitally program the on-time of a one-shot multivibrator circuit.  More and more, the Internet is playing a role in control operations in industrial and R&D endeavors and in household appliances.  One-shot circuit__ Design by J Jayapandian, IGCAR, Tamil Nadu, India

1-Shot Provides Frequency Discrimination -  05/01/03  EDN-Design Ideas - 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 __ Circuit Design by Victor Aksenenka, CSRI Elektropribor, St Petersburg, Russia

1-Shot Remembers Input-Pulse Width -  07/18/96  EDN-Design Ideas - The circuit in Figure 1a remembers the width of an input pulse at the in terminal.  After the input pulse returns to zero, a trigger input causes an output pulse to occur at the out terminal.  This output pulse is proportional to the width of the input pulse.  R2 and R3 set this pulse-width ratio.  For the values shown, the output pulse is half __ Circuit Design by Ray Kauffman, Electronic Devices Inc, Chesapeake, VA

1-Shot Timer for Energy Saving Lighting -  Note that the circuit is coupled directly to AC mains using the existing system in the building.  A switch is used to start the timing and light one or more bulbs.  The relay is powered from 12V and its contacts must outstand up to 1kW at 220V.   __ Designed by Popescu Marian

555 Monostable -  Basic circuits and information about this timer/oscillator.  Scroll to find the 555 Monostable Circuit.   __ Designed by Jose Pino

555 Monostable -  Use of the ubiquitous 555 timer in monostable mode.   __ Designed by Andy Collison

555 Timer Monostable 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, a capacitor can be used to isolate the switch __ Designed by Bill Bowden

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,. . . Circuit by Dave Johnson P.E.-September, 2010

Add Function to a Monostable Multivibrator -  7-Aug-08 EDN-Design Ideas - Adding an oscillator and counters to a monostable multivibrator allows you to generate multiple gate outputs from a single input pulse __ Circuit Design by PM Ishtiaq, S Mufti, MA Darzi, and GN Shah, Nuclear Research Laboratory, Bhabha Atomic Research Centre, Kashmir, India

Adjustable Bipolar Clamp -  11/22/01  EDN-Design Ideas - 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 __ Circuit Design by Pautasso Luciano, Nichelino, Italy

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 beeper 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

Astable Flip Flops -  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 __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Basic 555 Monostable -  Use of the ubiquitous 555 timer in monostable mode.   __ Designed by Andy Collison

Basic IC Monostable Multivibrator -  Schematic only, no circuit description included.   __ Designed by Tony van Roon  VA3AVR

Circuit Adds Functions to a Monostable Multivibrator -  7-Aug-08 EDN-Design Ideas - Adding an oscillator and counters to a monostable multivibrator allows you to generate multiple gate outputs from a single input pulse __ Circuit Design by PM Ishtiaq, S Mufti, MA Darzi, and GN Shah, Nuclear Research Laboratory, Bhabha Atomic Research Centre, Kashmir, India

Circuit forms adjustable bipolar clamp -  11/22/01  EDN-Design Ideas - 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 __ Circuit Design by Pautasso Luciano, Nichelino, Italy

Circuit forms clockless Programmable one-shot -  04/24/97 EDN-Design Ideas - Replace the timing resistor on a 74LS123 one-shot with a Howland current pump, drive the pump with a rail-to-rail voltage-output DAC, and you have a programmable one-shot with some unique features: single-supply operation, no clock required, a 25-to-1 pulse with adjustment range, and an "infinite" pulse-width capability.   __ Circuit Design by John Stauber, Picker International Inc, Highland Heights, OH

Circuit Forms Novel Floating Current Source -  1-May-03 EDN-Design Ideas - One-shot provide as frequency discrimination - Figure 1 shows a polarization circuit applicable to ISFET (ion-sensitive field-effect-transistor] sensors.  ISFETs are solid-state chemical sensors that measure the pH value of a solution in biomedical and environmental applications, for example.  The circuit in Figure 1 is extremely simple; it sets fixed-bias conditions for ISFET sensors (VDS=I0 RX; IDS=I0] __ Circuit Design by S Casans, AE Navarro, and D Ramirez, University of Valencia, Burjassot, Spain

Clockless Programmable one-shot -  04/24/97 EDN-Design Ideas - Replace the timing resistor on a 74LS123 one-shot with a Howland current pump, drive the pump with a rail-to-rail voltage-output DAC, and you have a programmable one-shot with some unique features: single-supply operation, no clock required, a 25-to-1 pulse with adjustment range, and an "infinite" pulse-width capability.   __ Circuit Design by John Stauber, Picker International Inc, Highland Heights, OH

Controller IC & one-shot form resonant controller -  11/28/02 EDN-Design Ideas - 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 __ Circuit Design by C Rajan, Centre for Advanced Technology, Indore, India

Delay Line Aids in One-shot Simulations -  EDN-Design Ideas - 04/26/01     Many designers use small pulse generators to delay signals, open timing windows, drive sample/hold circuits, and other functions.  Though the hardware implementation of these generators does not pose any problems, the lack of dedicated circuitry sometimes puzzles the Spice simulation of the system.  A common approach to this problem is to implement a time constant involving a resistor, a capacitor, and a comparator.  Unfortunately, each time you need a time constant, you must recalculate the resistor value, the capacitor value, or both.  Despite the fact that inline equations can do this job for you, delay lines can often offer a smarter solution.    __ Circuit Design by Christophe Basso, On Semiconductor, Toulouse, France

Delayed One Shot -  This circuit highlights the use of the LTC6994 Delay Block/ Debouncer and LTC6993 Monostable Pulse Generator in a delayed one-shot application.  The LTC6994 is configured to provide a rise time delay of 50ms and the LTC6993 is configured to provide a 10ms one shot.  The LTC6994 is a programmable delay block with a range of 1μs__ Linear Technology/Analog Devices App Note, Oct 26th 2010

Delayed Pulse Generator -  This circuit generates a short 10ms pulse 15 minutes after a “start” pushbutton switch is activated. . . Circuit by David A. Johnson P.E.-October, 2005

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. . . Circuit by Dave Johnson P.E.-June, 2000

Dual one-shot makes rising- & falling-edge Detector -  03/04/99 EDN-Design Ideas - (Page includes several designs.  Scroll to find this one) The design in Figure 1 is an upgraded version of the circuit in a previous Design Ideas (" 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.  The circuit generates a pulse on both the rising and the falling edges of a signal.    __ Circuit Design by Santo Camonita, Catania, Italy


One Shot / Monostable Circuits:  #'s - F       G - Z

 


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