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Bistable Multivibrator or Flip/Flop Circuits
Bistable (Flip-Flop):  #'s - D        E - N        O - Z

 

Last Updated: November 30, 2017 07:38 AM

Circuits Designed by Dave Johnson, P.E.

One Shot (D-Flip/Flop) 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 David A. Johnson P.E.-June, 2000

Oneshot & Latch Pushbutton -  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 . . . Hobby Circuit designed by David Johnson P.E.-March, 2002

Pushbutton Oneshot & 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. . . Circuit by David A. Johnson P.E.-March, 2002

Slotted Opto-Sensor used in Honeybee Counter -  I designed a circuit similar to this one a long time ago to help a beekeeper count the number of bees going into or out of a hive.  The low power circuit uses a slotted opto-sensor to detect the passing bees.  The circuit advances an electronic counting . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2000

Timer for Darkroom Camera Shutter -  This circuit was designed to control a film exposure shutter for a darkroom.  It has 8 time steps ranging from 0.35 seconds to 4 seconds.  It is activated by a foot switch and draws power from an external 12-volt DC supply . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

Touch Activated Switch -  This circuit provides about one watt of non-isolated DC power for an automotive type 12v LED array lamp in addition to a standard incandescent table lamp.. . . Circuit by David A. Johnson P.E.-January, 2002

Turn D-Flip/Flop into a 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 . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000


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

On/Off Flip/Flop Circuit with Automatic Timeout -  This circuit is ideal when a device needs to be turned on and off with a single pushbutton switch, but also needs to turn itself off after some period of time.  With the components shown, the output will stay on for only about 20 seconds. . . Circuit by Dave Johnson P.E.-May, 2012

One Hz Pulse Frequency Generator -  Here is a 1Hz pulse/frequency generator using the popular timer IC 555 which is wired as an Astable Multivibrator.  The output pulses can be indicated visually by the LED.  An Astable Multivibrator, often called a free-running Multivibrator, is a rectangular-wave generating circuit.  Unlike the Monostable Multivibrator, this __ Designed by D Mohankumar

One Shot (D-Flip/Flop) 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 David A. Johnson P.E.-June, 2000

One-IC-based electronic replaces mechanical switch -  03/15/07 EDN-Design Ideas Flip-flops debounce pushbutton switchsample and inexpensive electronic circuit uses a low-cost pushbutton switch to toggle the electrical power on and off.  The circuit replaces a more costly and bulky push-push mechanical swit __ Circuit Design by Santosh Bhandarkar, Bangalore, India

Oneshot & Latch Pushbutton -  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 . . . Hobby Circuit designed by David Johnson P.E.-March, 2002

Op Amp as a Set/Reset Flip-Flop -  05/24/12  EDN-Design Ideas Eliminate a flip-flop package by using a spare op amp for an SR latch function.  You can make a set/reset flip-flop from two NAND or NOR gates or use readily available set/reset flip-flop ICs, such as the 74HC279 quad-set/reset latch __ Circuit Design by Aruna Rubasinghe

Precision integrator sparks current-ratio-to-frequency converter -  24-May-07 EDN-Design Ideas A precision integrator generates a pulse train whose frequency is proportional to the ratio of two input currents __ Circuit Design by Stefano Salvatori and Gennaro Conte, Universitŕ degli Studi di Roma Tre, Rome, Italy

Programming Pulse Generators for Flash Memories -  DN17 Design Notes __ Linear Technology/Analog Devices

Pulse Generator -  This circuit is very useful while checking/operating counters, steping relays, etc.  It avoids the procedure of setting a switch for the required number of pulses.  By pressing appropriate switches S1 to __ Electronics Projects for You

Pulse generator -  Pulse Generator kit will generate a frequency in KHz which can form a good test gear project.  This kit is based on the classic LM555 timer IC. __ Contact:   Rajkumar Sharma

Pulse generator -  A 555 pulse generator circuit with a difference, the initial pulse is tailored by additional circuitry to match the duration of subsequent pulses. __ Designed by Miroslav AdzicSerbia & Montenegro

Pulse Generator & Signal Tracer -  This simple circuit generates narrow pulses at about 700-800Hz frequency.  The pulses, containing harmonics up to the MHz region, can be injected into audio or radio-frequency stages of amplifiers, receivers and the like for testing purposes.  A high-pitched tone can be heard from the speaker of the device under test when all is working properly. __ Learning Electronics

Pulse generator aids IC testing -  09/01/09 Test & Measurement World:As ICs increase in complexity and decrease in size, their pin counts drop or, at best, remain constant.  The result: a need for pin-saving measures like serial programming.  In the past, multiple pins might have been available for programming an IC’s current or voltage limit, but today’s ICs often encode that limit as a set number of pulses on a serial line.  -- [Kevin Frick, Integrated Products, Sunnyvale, CA]

Pulse Generator Corrects Itself -  07/29/10 EDN-Design Ideas Use three flip-flips to correct for errors. __ Circuit Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

Pulse generator has low top-side aberrations -  05/25/00 EDN-Design Ideas Impulse-response and rise-time testing often require a fast-rise-time source with a high degree of pulse purity.  These parameters are difficult to achieve simultaneously, particularly at subnanosecond speeds.  The circuit in Figure 1, derived from oscilloscope __ Circuit Design by Jim Williams, Linear Technology Corp, Milpitas, CA

Pulse Generator Verifies Test Setups -  05/26/94 EDN-Design Ideas Verifying the rise-time limit of wideband test-equipment setups is a difficult task.  In particular, you must often know the "end-to-end" rise time of an oscilloscope/probe combination to ensure measurement integrity.  Fig1s circuit provIdeas an 800-psec pulse having rise __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

Pulse Generator with Precision Output-Duty Cycle Operates At a Repetition Rate Beyond 50 Mhz -  05/13/10 EDN-Design Ideas A previous Design Ideasdescribes an astable multivibrator that gets hysteresis from the positivefeedback stage using a technique you can characterize as positive-capacitive feedback (Reference 1).  It creates hysteresis by a charge __ Circuit Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

Pulse Generator-High-Voltage -  Voltage, by definition, is the electrical pressure that causes current to flow through a conductor.  When that pressure is sufficiently high, a high voltage is produced.  But how do we define high-voltage? Is 100, 1000, or 10, 000 volts considered high voltage? When compared to 10 volts, they all can be considered high voltage __ Designed by Tony van Roon  VA3AVR

Pulse Receiver -  NOTE : Must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Pulse Stretcher Increases ECL-Gate Gains -  01/20/94 EDN-Design Ideas stretches the output pulses of an ECL comparator by operating the ECL line receivers with unusually large pulldown resistors to the -15V supply.  The large load resistance maximizes the gains of the emitter-follower output stages and speeds up the rising edges __ Circuit Design by Nicholas J Bucska, PC Peripherals, Louisville, CO

Pulse Width Modulator -  The IC used is a CMOS type MC14093, a quad 2-input NAND Schmitt trigger.  If you wish, it can be directly interchanged with the CMOS MC14011 but this type is noisy.  The speed is adjustable from 0-max.  Max rpm is 2/3 the supply voltage __ Designed by Tony van Roon  VA3AVR

Pulse Width Modulator, LM324 -  Schematic only, no circuits description. __ Designed by Tony van Roon  VA3AVR

Pulse Width Trimmer Outdoes One-shots -  03/03/97 EDN-Design Ideas The simple circuit in Figure 1a trims the trailing portion of a large-width input pulse to a size as narrow as 10 nsec.  The input to the circuit is an active-low TTL pulse longer than 10 nsec or a continuous low level after a hig __ Circuit Design by Shyam Sunder Tiwari, IGCAR, Kalpakkam, India

Pulsed Sensor Extends Battery Life -  01/01/98 EDN-Design Ideas  Activating the sensor circuit in Figure 1 for 1 sec every 30 minutes lowers its 20-mA supply current to an average of 70 µA.  For a battery comprising three AA Duracells, this pulsed operation extends the battery's life to several years.  The sensor uses an optocoupler and an IR-emitting diode __ Circuit Design by Terry Millward, Maxim Integrated Products, Reading, UK

Pulse-Generator & Signal-Tracer -  Dual-purpose test-instrument; Very simple circuitry, 1.5V Battery-operated __ Contact: Flavio Dellepiane, fladello @ tin.it

Pulse-Width Adjuster Reverses Servo Motor -  03/17/94 EDN-Design Ideas Typical remote-control systems and robotics applications use standard R/C servos, which often require a reversal of the direction of rotation.  Since varying the input signal's pulse width between 1 and 2 msec controls the servo's output position, a circuit that adjusts the pulse width __ Circuit Design by Joe Utasi, Jomar Products Corp, Cincinnati, OH

Pushbutton Oneshot & 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. . . Circuit by David A. Johnson P.E.-March, 2002

PWM CD4093 -  The IC used is a CMOS type MC14093, a quad 2-input NAND Schmitt trigger.  If you wish, it can be directly interchanged with the CMOS MC14011 but this type is noisy.  The speed is adjustable from 0-max.  Max rpm is 2/3 the supply voltage __ Designed by Tony van Roon  VA3AVR

PWM Timer with  555 -  Schematic only, no circuits description. __ Designed by Tony van Roon  VA3AVR

SCR Flipflop for Alternating Flashing Light Bulbs -  Schematic only __ Designed by G.L. Chemelec

Set Reset Flip flop -  This is an example of a set/reset flip flop using discrete components.  When power is applied, only one of the transistors will conduct causing the other to remain off.  The conducting transistor can be turned off by grounding it's base through the push button which causes the collector voltage to rise and turn on the opposite transistor. __ Designed by Ashish Parab

Set/Reset Flip Flop -  This is an example of a set/reset flip flop using discrete components.  When power is applied, only one of the transistors will conduct causing the other to remain off.  The conducting transistor can be turned off by grounding it's base through the push button which causes the collector voltage to rise and turn on the opposite transistor.  Copyright 2006 [url=www.  bowdenshobbycircuits.  info]Bill Bowden[/url] __ Designed by Bill Bowden

Simple Circuit Detects Current Pulse -  01/06/94 EDN-Design Ideas The pulse detector provIdeas a visible indication of positive and negative current pulses.  The pulses amplitudes can vary from20 to150 mA.  The pulses durations can range from10 to40 msec, and their repetition rate can span40 to180 pulses/minute __ Circuit Design by Richard McGillivray, Grey Bruce Regional Health Centre, Owen Sound, Ontario, Canada

Single-IC-based electronic replaces mechanical switch -  03/15/07 EDN-Design Ideas Flip-flops debounce pushbutton switchsample and inexpensive electronic circuit uses a low-cost pushbutton switch to toggle the electrical power on and off.  The circuit replaces a more costly and bulky push-push mechanical swit __ Circuit Design by Santosh Bhandarkar, Bangalore, India

Slotted Opto-Sensor used in Honeybee Counter -  I designed a circuit similar to this one a long time ago to help a beekeeper count the number of bees going into or out of a hive.  The low power circuit uses a slotted opto-sensor to detect the passing bees.  The circuit advances an electronic counting . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2000

Soft On/Off Switch -  Modern electronic equipment incorporate "push-to-on-push-to-off" switches that do not make noise as with old equipment.  An example of this is the power button on a ATX computer cabinet.  Here is a circuit that does the same.  It can be used to turn on/off

Sound Controlled Flip Flop -  Described here is a very inexpensive solution to many phono-controlled applications like remote switching on, for instance, or activating a camera, tape recorder, burglar alarms, toys, etc.  The circuit given here employs a condenser microphone as the pick-up.  A two-stage amplifier built around a quad op-amp IC LM324 offers a good gain to enable sound pick-up upto four metres. 

Spare Flip-Flop Stretches WR Strobe for DSP -  07/20/95 EDN-Design Ideas A 74LS592 programmable counter(not available in high-speed F or ACT versions) is a convenient IC to use in DSP applications, such as in an ADSP-2101 design running at 10 MHz.  However, a close inspection of the counter's worst-case timing specifications and the WR strobe width reveals that the 74LS592 fails __ Circuit Design by Dhananjay Gadre, IUCAA Instrumentation Lab, Pune, India

Spare Gates Form Edge-Triggered Flip-Flop -  03/16/95 EDN-Design Ideas Applying fundamental-mode state-machine techniques creates a useful, edge-triggered, D-type, dual flip-flop from spare PLD gates and pins.  Such a flip-flop has the following characteristics: You can easily define the polarity of its signals using any PLD compiler.  Data at the D input strobes to the Q output on an active edge of clock C.   Clock-to-output delay is the input-to-output propagation delay of the PLD. __ Circuit Design by Vo-Ba Cao and Bradley Brown, Computing Devices Canada, Alberta, Canada and Iders Inc, Manitoba, Canada

Telephone Line Based Audio Muting & Light-On Circuit -  Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important incoming phone call.  To __ Electronics Projects for You

Three Phase Oscillator -  Several schematics on this page, scroll to find this one.  The first circuit is a dual ramp generator where the positive and negative ramps are generated separately.  This circuit was used as a ramp generator for a transistor curve tracer: the positive going ramp was used for testing NPN transistors and the negative ramp for testing PNP transistors. __ Designed by Richard Torrens

Timebase generator -  One Minute/One Second Pulse generator.  Ideal to be used to build any clock.  Uses a 12F629. __ Designed by Jose Pino

Timer for Darkroom Camera Shutter -  This circuit was designed to control a film exposure shutter for a darkroom.  It has 8 time steps ranging from 0.35 seconds to 4 seconds.  It is activated by a foot switch and draws power from an external 12-volt DC supply . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

Touch Activated Switch -  This circuit provides about one watt of non-isolated DC power for an automotive type 12v LED array lamp in addition to a standard incandescent table lamp.. . . Circuit by David A. Johnson P.E.-January, 2002

Turn D-Flip/Flop into a 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 . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Use an Op Amp as a Set/Reset Flip-Flop -  05/24/12  EDN-Design Ideas Eliminate a flip-flop package by using a spare op amp for an SR latch function.  You can make a set/reset flip-flop from two NAND or NOR gates or use readily available set/reset flip-flop ICs, such as the 74HC279 quad-set/reset latch.  The drawback of these methods is that they require a large amount of space to form the flip-flop.  Even if you need only one flip-flop, you must use a large IC package with this approach.  However, you can use a spare rail-to-rail op amp to perform the needed latch function (Figure 1). __ Circuit Design by Aruna Rubasinghe

Variable Frequency PWM -  Schematic only, no circuits description. __ Designed by Tony van Roon  VA3AVR

Verilog Program Models Metastable Flip-Flop -  05/12/94 EDN-Design Ideas The Verilog HDL program in Listing 1allows you to simulate the behavior of a set-reset(SR] flip-flop that has both its set and reset inputs high simultaneously.  The outputs of a physical SR flip-flop become indeterminate in this condition.  This property is the basis of circuits such as random-number and pseudo-noise-sequence(PSN] generators __ Circuit Design by Swapnajit Mittra, Wipro Infotech Ltd, Bangalore, Karnataka, India


Bistable (Flip-Flop):  #'s - D        E - N        O - Z


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