Bistable Multivibrator or Flip/Flop Electronic Circuits-Page 4

Bistable Multivibrator or Flip/Flop Circuits - Page 4
Bistable (Flip-Flop): #'s-D E-H I-R S-Z
Last Updated on: Wednesday, June 02, 2021 04:22 AM

Circuits designed by David A. Johnson, P.E.:

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., 7/08/00]
Time to Dust Indicator - I thought about this circuit when I heard that a lot cleaning personal in hotels were either dusting rooms more often than necessary or not enough. I have not yet built and tested this circuit completely but in concept it should work… [Circuit by David Johnson P.E., 6/06/00]
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 A. Johnson P.E., 6/11/00]

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 A. Johnson P.E., 6/11/00]
Touch Activated Switch Needs 1.5 Volts - A single 1.5v silver oxide button cell powers this complete touch activated switch circuit for 5 years. It features both a normally open and a normally closed set of solid state switch thermals. It also has an adjustable sensitivity, which can be set… [Hobby Circuit designed by David Johnson P.E., 1/18/02]
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 David Johnson P.E., 6/06/00]
Zero-Cross Detector-Wide Band - This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave signal. It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak. The input frequency can range from a few kilohertz to about 150… [Circuit by David Johnson P.E., 2/18/06]

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

SCR Flipflop for Alternating Flashing Light Bulbs - Schematic only, no circuit description. . . [designer unknown]

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, Bill Bowden]

Single-IC-based electronic circuit replaces mechanical switch - 03/15/07 EDN Design Idea Flip-flops debounce pushbutton switch - sample 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. . . [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., 07/08/00]

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 Idea 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-cas. . . [by Dhananjay Gadre, IUCAA Instrumentation Lab, Pune, India]

Spare Gates Form Edge-Triggered Flip-Flop - 03/16/95 EDN Design Idea 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. . . [by Vo-Ba Cao and Bradley Brown, Computing Devices Canada, Alberta, Canada and Iders Inc, Manitoba, Canada]

Three Phase Oscillator - Several schematics on this page, scroll to find this one. The second circuit is a 3 phase squarewave oscillator, or tristable. Its operation should be reasonably obvious and it is like a simple bistable oscillator with 3 stages. . . . [Page's Author: Richard Torrens]

Time to Dust Indicator - I thought about this circuit when I heard that a lot cleaning personal in hotels were either dusting rooms more often than necessary or not enough. I have not yet built and tested this circuit completely but in concept it should work . . . [Circuit by David Johnson P.E., 06/06/00]

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., 06/11/00]

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., 01/18/02]

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., 06/06/00]

Use An Op Amp As A Set/Reset Flip-Flop - 05/24/12 EDN Design Idea 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). . . . [by Aruna Rubasinghe]

Bistable (Flip-Flop): #'s-D E-H I-R S-Z