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

Last Updated on: Thursday, April 07, 2016 01:00 PM

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

Bistable Multivibrator or Flip/Flop Circuits
Page 1         Page 2

  • 1.5V Touch Activated Switch -  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 for a touch capacitance change as small as 1 picofarad.… [Circuit by Dave Johnson P.E., 1/18/02]
     

  • 12v DC Motor with Logic Controlled Automatic Brake -  There are times when you would like to control a DC motor using a simple +5v logic swing signal.  The circuit below performs this feat and also includes an automatic motor braking circuit.  When the input logic signal swings from 0v to +5v, the n-channel… [Hobby Circuit designed by David A. Johnson P.E., 2/18/10]
     

  • 12v Touch Switch Exciter Circuit -  This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.  It can support a cable length of about 2500 feet.  A typical remote switch circuit is also shown as well as a receiver circuit for those switches.… [Circuit by Dave Johnson P.E., 2/10/02]
     

  • 3v Capacitance Proximity Switch -  This circuit was designed to provide a touch activated switch function without an external power supply.  It draws so little power that a single 3v battery will operate the circuit for many years… [Circuit by Dave Johnson P.E., 2/12/02]
     

  • 40Khz Laser Burst Detector -  This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part of a firearm training system. It generates a 100mS output pulse whenever it detects a 3ms to 5ms-laser burst,… [Hobby Circuit designed by David Johnson P.E., 6/13/00]
     

  • 40Khz Light Receiver Amp -  This circuit is similar to 30KHZ LIGHT RECEIVER AMP  but provides more gain and operates up to 40KHz. However it draws more power supply current.… [Circuit by David A. Johnson P.E., 3/07/02]
     

  • 6V TO 24V DC Day/Night Switch -  Using an inexpensive phototransistor, this circuit switches 12v to 24v power to a load, whenever the sun goes down… [Circuit by Dave Johnson P.E., 7/09/06]
     

  • 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,… [Hobby Circuit designed by David Johnson P.E., 9/02/10]
     

  • Advertising Badge with Flashing LED #1 -  I have seen numerous flashing light badges at trade shows and conventions. They are often handed out as gifts to promote some business. The devices often use inefficient circuits, which cause the battery power source to be quickly depleted… [Hobby Circuit designed by David A. Johnson P.E., 3/26/02]
     

  • Advertising Badge with Flashing LED #2 -  This circuit uses a CD4013 dual D Flip/Flop IC.  A single lithium battery will provide months of continuous LED flashing.  It also has a tiny push-button switch to turn on and off the light flashing… [Circuit by David A. Johnson P.E., 3/26/02]
     

  • Alarm-Piezo Device detects Motion -  Using a piezo device, this circuit will activate a beeper whenever the circuit is moved.  It could be used as an earthquake alarm… [Circuit by Dave Johnson P.E., 7/09/06]
     

  • Automatic Timeout included with this On/Off Flip/flop Circuit -  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… [Hobby Circuit designed by David A. Johnson P.E., 5/01/12]
     

  • Battery Powered Capacitance Switch -  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 for a touch capacitance change as small as 1 picofarad.… [Hobby Circuit designed by David Johnson P.E., 1/18/02]
     

  • Battery-Powered LED Flashing Advertising #2 -  This circuit is similar to flashing LED advertising badge #1.  It uses a CD4013 dual D Flip/Flop IC.  The 74HCT74 IC in #81 does not always work.  As in #81, a single lithium battery will provide months of continuous LED flashing.… [Hobby Circuit designed by Dave Johnson P.E., 3/26/02]
     

  • Capacitance Proximity Switch-3 volts -  This circuit was designed to provide a touch activated switch function without an external power supply.  It draws so little power that a single 3v battery will operate the circuit for many years… [Hobby Circuit designed by David A. Johnson P.E., 2/12/02]
     

  • Capacitance Proximity Switch-3 volts -  This circuit was designed to provide a touch activated switch function without an external power supply.  It draws so little power that a single 3v battery will operate the circuit for many years… [Hobby Circuit designed by David A. Johnson P.E., 2/12/02]
     

  • Circuit Forms Divide By 1.5 Counter -  Two inexpensive ICs divide a TTL clock signal by 1.5. By following the circuit with another flip/flop, you could also generate a divide by three function… [Circuit by David Johnson P.E., 7/06/00]
     

  • Clear Fluid Detector #2 -  Using an ultra low power technique, this circuit detects when a clear fluid is inside a piece of clear plastic tubing. It can be used for fluid level control and monitoring… [Circuit by Dave Johnson P.E., 10/22/05]
     

  • Closet Light with Automatic 3-Minute Timeout -  The circuit below is powered by three 1.5v alkaline AA cells.  With a finger tap to the pushbutton trigger switch, a cluster of 6 wide angle white LEDs is turned on. The lights remain on for about 3 minutes, then will turn off.  The circuit’s standby current is only a few microamps.  A set of fresh batteries should last at least 200 light applications.  The circuit uses a Schmitt trigger inverter and two transistors.  When the pushbutton switch S1 is pressed, the 10uF capacitor C1 is discharged… [Circuit by Dave Johnson P.E., 11/14/10]

  • Darkroom Camera Shutter Timer -  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… [Circuit by David A. Johnson P.E., 6/11/00]
     

  • DC Current Indicator 6 -  The circuit below is a simple way to indicate when DC current is flowing through a wire.  The circuit is designed so it will turn on a LED indicator light, whenever the voltage drop across a shunt resistor exceeds about 0.1 volts.  The value of the resist… [Hobby Circuit designed by David Johnson P.E., 10/16/05]
     

  • Delayed Pulse Generator -  This circuit generates a short 10ms pulse 15 minutes after a “start” pushbutton switch is activated… [Circuit by Dave Johnson P.E., 10/16/05]
     

  • Divide a TTL Clock Signal by 1.5 -  Two inexpensive ICs divide a TTL clock signal by 1.5. By following the circuit with another flip/flop, you could also generate a divide by three function… [Hobby Circuit designed by David A. Johnson P.E., 7/06/00]
     

  • Divide By 1.5 Counter -  Two inexpensive ICs divide a TTL clock signal by 1.5. By following the circuit with another flip/flop, you could also generate a divide by three function… [Circuit by David Johnson P.E., 7/06/00]
     

  • Drive a LED with an Intensity Ramping Mode -  The circuit below was designed to drive a LED with an intensity ramping mode.  Two 555 timers generate two different triangle waveforms.  The upper device generates a 10KHz signal while the lower unit produces a 1Hz signal.  The two signals are fed to a… [Hobby Circuit designed by David Johnson P.E., 12/21/07]

 

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

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 A. Johnson P.E.,  09/02/10]

 

1.5V Touch Activated Switch -  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 for a touch capacitance change as small as 1 picofarad.  . . . [Circuit by David A. Johnson P.E.,  01/18/02]

 

12F675 as a Flip Flop -  Code to make a 12F675 operate as a D-type or JK-type flip flop. Since I implemented a D type flip flop usingPIC Logic Elements I thought I might goor way and implement an entire D type flip flop in a single PIC. This usesedge triggered and port change status interrupts and was an opportunity to have a play with interrupts onPIC. . . 

 

12v Touch Switch Exciter Circuit -  This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.   It can support a cable length of about 2500 feet.   A typical remote switch circuit is also shown as well as a receiver circuit for those switches.  . . . [Circuit by David Johnson P.E.,  02/10/02]

 

1-IC-based electronic circuit replaces mechanical switch -  03/15/07 EDN Design Idea   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. . .  [by Santosh Bhandarkar, Bangalore, India]

 

3v Capacitance Proximity Switch -  This circuit was designed to provide a touch activated switch function without an external power supply. It draws so little power that a single 3v battery will operate the circuit for many years . . . [Circuit by David A. Johnson P.E.,  02/12/02]

 

555 Bistable Circuit -  Basic circuits and information about this timer/oscillator. Scroll to find Bistable Circuit. . .  [designed by Jose Pino]

 

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 David A. Johnson P.E.,  09/02/10]

 

Advertising Badge #1 with Flashing LED -  I have seen numerous flashing light badges at trade shows and conventions. They are often handed out as gifts to promote some business. The devices often use inefficient circuits, which cause the battery power source to be quickly depleted . . . [Circuit by Dave Johnson P.E.,  03/26/02]

 

Advertising Badge #2 with Flashing LED -  This circuit uses a CD4013 dual D Flip/Flop IC. A single lithium battery will provide months of continuous LED flashing. It also has a tiny push-button switch to turn on and off the light flashing . . . [Circuit by David Johnson P.E.,  03/26/02]

 

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

 

AN-1150: COP8 FLASH ISP HANDBOOK-Intro to ISP -  Application Note. . .  [National Semiconductor]

 

AN-1281:Bumped Die Flip Chip Packages -  Application Note. . .  [National Semiconductor]

 

Automatic Timeout included with this On/Off Flip/flop Circuit -  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 . . . [Hobby Circuit designed by David A. Johnson P.E.,  05/01/12]

 

Battery-Powered LED Flashing Advertising #2 -  This circuit is similar to flashing LED advertising badge #1.   It uses a CD4013 dual D Flip/Flop IC.   The 74HCT74 IC in #81 does not always work.   As in #81, a single lithium battery will provide months of continuous LED flashing.  . . . [Hobby Circuit designed by David Johnson P.E.,  03/26/02]

 

Bistable Flip flop -  Here are two examples of bistable flip flops which can be toggled between states with a single push button. When the button is pressed, the capacitor connected to the base of the conducting transistor will charge to a slightly higher voltage. When the button is released, the same capacitor will discharge back to the previous voltage causing the transistor to turn off. The rising voltage at the collector of the transistor that is turning off causes the opposite transistor to turn on and the circuit remains in a stable state until the next time the button is pressed and released. . . .  [by Ashish Parab]

 

Capacitance Proximity Switch-3 volts -  This circuit was designed to provide a touch activated switch function without an external power supply. It draws so little power that a single 3v battery will operate the circuit for many years . . . [Hobby Circuit designed by David A. Johnson P.E.,  02/12/02]

 

Capacitance Touch Switch -  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.,  01/18/02]

 

Circuit Indicates 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.,  05/07/06]

 

CMOS Toggle Flip Flop using Laser Pointer -  The circuit below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button. Several push buttons can be wired in parallel to control the relay from multiple locations. A high level from the push button is coupled to the set line through a small (0. 1uF) capacitor. The high level from the Q output. . .  [Bill Bowden's site]

 

CMOS Toggle Flip Flop Using Push Button -  The circuit below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button. Several push buttons can be wired in parallel to control the relay from multiple locations. A high level from the push button is coupled to the set line through a small (0. 1uF) capacitor. The high level from the Q output. . .  [Bill Bowden's site]

 

DAC and flip-flops form constant-current-source -  04/23/09  EDN Design Idea   Using two flip flops, you can program a serial-input DAC to produce a constant 4 mA. . .  [by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]

 

Darkroom Camera Shutter Timer -  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 . . . [Circuit by David A. Johnson P.E.,  06/11/00]

 

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.,  10/16/05]

 

Descrete Set/Reset Flip Flop -  Here are two examples of bistable flip flops which can be toggled between states with a single push button. When the button is pressed, the capacitor connected to the base of the conducting transistor will charge to a slightly higher voltage. When the button is released, the same capacitor will discharge back to the previous voltage causing the transistor to turn off. The rising voltage at the collector of the transistor that is turning off causes the opposite transistor to turn on and the circuit remains in a stable state until . . .  [Bill Bowden, designer]

 

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 David A. Johnson P.E.,  06/06/00]

 

Discrete BiStable Flip Flop -  . . .  [Bill Bowden, designer]

 

Discrete 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. . . .  [Bill Bowden, designer]

 

Dual Flip-Flop Forms Simple Delayed-Pulse Generator -  04/17/08  EDN Design Idea   A delayed pulse generator provides precision timing adjustments. . .  [by Luca Bruno, ITIS Hensemberger Monza, Lissone, Italy]

 

Dual Microphones Separate Voice from Noise -  06/23/94 EDN Design Idea   The circuit in Fig 1 uses a pair of microphones to extract a voice from a noisy background. You must mount electret microphones X1 and X2 on the left and right sides of the user's chest. Sound sources not equidistant from the microphones experience a phase shift. Because sound travels at 1120 ft/sec, the maximum phase shift for this design's/. . .  [by Samuel Kerem, Infrared Fiber Systems, Silver Spring, MD]


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


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