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Pulse Generator Circuits, Page 2
#'s - L      M - Z
Last Updated on: Thursday, October 30, 2014 09:22 AM


Circuits Designed by Dave Johnson, P.E. :
  • MICROPOWER PULSE GENERATOR
    it is hard to design a pulse generator that produces clean logic pulses while drawing very low current. This circuit is designed to produce short 2mS pulses at a rate of one per second while drawing only 1 microamp from a 9 volt battery.

  • Ultra Low Power Astable Multivibrator
    Taking advantage of some voltage comparators, this circuit can produce a nice square wave signal while drawing only 1.6 microamps.  With the inclusion of a diode, the circuit can also produce short pulses instead of a square wave signal.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
Micropower Pulse Generator -  it is hard to design a pulse generator that produces clean logic pulses while drawing very low current.  This circuit is designed to produce short 2mS pulses at a rate of one per second while drawing only 1 microamp from a 9 volt battery.... [Designed by David A. Johnson]

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Minimize the short-circuit current pulse in a hot swap controller -  27-May-04 Issue of EDN  Because of internal circuit-breaker delay and limited MOS-gate pulldown current, many hot-swap controllers do not limit current during the first 10 to 50 µsec following a shorted output. The result can be a brief flow of several hundred amperes. A simple external circuit can counter this problem by minimizing the initial current spike and terminating the short circuit within 200 to 500 nsec.... [Design Idea by Jim Sherwin and Thong Huynh, Maxim Integrated Products, Sunnyvale, CA]
Monostable Flip Flops (One Shot) -  The two circuits below 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 design]
Multi Pulse Generator - I used this circuit to ring my doorbell rapidly three times when a car pulled into my driveway.  R2 and C2 set the output frequency.  Use a diode and resistor to change the duty cycle, if desired.  R1 and C1 set the cycle time which sets the number of pulses.  R3 can be deleted if you have other loads on the power supply.  The circuit is activated by applying power to it.  The first pulse with be longer than the others. [Designed by Andrew R. Morris]
Nanosecond SCR Switch for Reliable High Current Pulse Generators & Modulators -  MicroNote 601 from Microsem....[App Note]
Precision integrator sparks current ratio to frequency converter -  24-May-07 Issue of EDN  A precision integrator generates a pulse train whose frequency is proportional to the ratio of two input currents.... [Design Idea 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) (app note added 6/06)
Pulse generator -  (electronic circuit designed by Miroslav Adzicadded 6/07)
Pulse Generator & Signal Tracer -  Dual-purpose test-instrument Very simple Circuitry,1.5 Volt Battery-operated....
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, Maxim Integrated Products, Sunnyvale, CA]
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.... [Design Idea 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 provides an 100%-psec pulse.... EDN is migrating links. This link is not verified.  Search the "title" + EDN for new link.
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.…. [Rewritten by Tony van Roon (VA3AVR)]
Pulse Receiver -  ….must register on this site.... [Published in Elecktor July/August 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.... [Design Idea by Nicholas J Bucska, PC Peripherals, Louisville, CO]
Pulse Timer, 555 -  A question I see cropping up quite often on the forum is "how do I switch on a relay for 'x' seconds with a 'y' volts pulse". You can use this circuit as a building block.…. [Paul Hancock's circuit]
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.... EDN is migrating links. This link is not verified.  Google the "title" + EDN for new link.
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 high-to-low transition. The output is a fixed 10-nsec pulse,.... EDN is migrating links. This link is not verified.  Google the "title" EDN for new link.
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.... [Design Idea by Terry Millward, Maxim Integrated Products, Reading, UK]
Simple Circuit Detects Current Pulses -  01/06/94 EDN-Design Ideas....The pulse detector provides 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.... [Design Idea by Richard McGillivray, Grey Bruce Regional Health Centre, Owen Sound, Ontario, Canada]
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(added 14/02)
Timebase generator -  One Minute/One Second Pulse generator. Ideal to be used to build any clock. Uses a 12F629. (electronic schematic added 05/31/04)
Ultra Low Power Astable Multivibrator -  Taking advantage of some voltage comparators, this circuit can produce a nice square wave signal while drawing only 1.6 microamps.  With the inclusion of a diode, the circuit can also produce short pulses instead of a square wave signal.... [Designed by David A. Johnson]

Pulse Generator Circuits:  #'s - L      M - Z


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