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Pulse Generator Circuits
#'s - G      H - O      P - Z



Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

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

 Time to Dust - I have used the circuit below for many different applications, which require ultra low power drain.  It uses a single CA4013 flip/flop.  One section forms a pulse generator.  The generator produces 100uS pulses at a rate of about 1 per second . . . Hobby Circuit designed by Dave Johnson P.E.-May, 2006

  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

TV_Fake_Camera_Flasher -  After having my doorbell rung several times in the middle of the night by some kids, I decided to install some fake TV cameras around the outside of my house.  I was not satisfied with the LED lights on the cameras.  The heavy current drain of the original circuit meant I would have to replace the battery every few months.  So, I removed the original LED driver and added my own simple flashing circuit.   . . . Hobby Circuit by David Johnson P.E.-August, 2017

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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 Adzic - Serbia & 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 provide as 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 ideas - describes 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

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

Simple Circuit Detects Current Pulse -  01/06/94 EDN Design Ideas:  The pulse detector provide as 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

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__ 

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

Time to Dust -  i have used the circuit below for many different applications, which require ultra low power drain.  it uses a single CA4013 flip/flop.  One section forms a pulse generator.  The generator produces 100uS pulses at a rate of about 1 per second . . . Hobby Circuit designed by Dave Johnson P.E.-May, 2006

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

TV_Fake_Camera_Flasher -  After having my doorbell rung several times in the middle of the night by some kids, I decided to install some fake TV cameras around the outside of my house.  I was not satisfied with the LED lights on the cameras.  The heavy current drain of the original circuit meant I would have to replace the battery every few months.  So, I removed the original LED driver and added my own simple flashing circuit.   . . . Hobby Circuit by David Johnson P.E.-August, 2017

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


Pulse Generator Circuits:  #'s - G      H - O      P - Z

 


Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches



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