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Delay Circuits
Delay Circuits:  #'s - O     P - Z
Last Updated on: Sunday, July 19, 2015 06:25 AM


Circuits Designed by Dave Johnson, P.E. :
  • Computer, Long Period, Watch Dog Timer -  This circuit uses a simple 4060 IC oscillator/timer that is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state. The time can easily be set from seconds to hours . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/01/98]

  • Long Period Computer Watch Dog Timer -  This circuit uses a simple 4060 IC oscillator/timer that is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state. The time can easily be set from seconds to hours . . . [Circuit by David Johnson P.E.,  01/01/98]

  • On/Off Latch Circuit with 2 Second Delay -  A Discover Circuits visitor needed a latch circuit which could operate using a power supply voltage ranging from 3v to 24v. He wanted to use a tiny pushbutton switch to turn on and off power to a load. However, he wanted a 2 second delay between the switch activation and the state change of the output . . . [Circuit by Dave Johnson P.E.,  06/30/13]

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

Butterworth filter has adjustable group delay -  08/08/02  EDN Design Idea   The Sallen-Key realization of a 5. 25-MHz, three-pole Butterworth filter has a gain of 2V/V and can drive 75Ω back-terminated coax with an overall gain of 1 (Figure 1). Used to reconstruct component-video (Y, Pb, Pr] and RGB signals, t. . . [by William Stutz, Maxim Integrated Products, Sunnyvale, CA]

 

Computer, Long Period, Watch Dog Timer -  This circuit uses a simple 4060 IC oscillator/timer that is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state. The time can easily be set from seconds to hours . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/01/98]

 

Delay Line Aids in One-shot Simulations -  04/26/01  EDN Design Idea   Many designers use small pulse generators to delay signals, open timing windows, drive sample/hold circuits, and other functions. Though the hardware implementation of these generators does not pose any problems, the lack of dedicated cir. . . [by Christophe Basso, On Semiconductor, Toulouse, France ]

Delay line eases Spice dead-time generation -  03/02/00  EDN Design Idea   Generating complementary clock signals in a Spice simulation is an easy task. However, this task gets much harder if you need to introduce some dead time into the signals. This difficulty is especially true when you're dealing with a variable-pulse-width. . . [by Christophe Basso, On Semiconductor, Toulouse, Cedex, France]

Delay line has wide duty-cycle range -  06/27/02  EDN Design Idea   Today's digital delay lines can process pulses no shorter than their delay times, and that restriction confines the devices to applications in which the duty cycle remains near 50%. A limited range of available delays (2 to 100 nsec. . . [by John Guy, Maxim Integrated Products, Sunnyvale, CA]

 

Delay Line implements Clock Doubler -  07/18/96  EDN Design Idea   Timing delays are undesirable in most digital circuits. However, in some cases, delays can be useful—to deal with a µP-speed-compatibility issue, for example. The circuit in Figure 1a uses a silicon T/4 delay line and an XOR gate to implement a simple clo. . . [by Y Li, SAE magnetics (HK) Ltd, Guang Dong Province, China]

 

Delay line upgrades vintage scope -  04/18/02  EDN Design Idea   Vintage triggered-sweep oscilloscopes find use in many applications. However, they have no internal delay line, so they can't display the pulse that triggers the sweep. Moreover, early laboratory scopes contain delay lines having i. . . [by Robert Houtman, Blaine, WA]

 

Delay Simulator Debugs Communications Equipment -  10/27/94 EDN Design Idea    Phone calls over satellite circuits experience a Ľ-sec transmission delay in each direction. The low-cost circuit (around $20]in Fig 1a simulates this delay and provides hooks for inserting noise, echo, and other. . . [by Stan Sasaki, Lake Oswego, OR]

 

Delayed Audible Alarm -  In this circuit, three multivibrator-type oscillators and a ripple counter are configured to produce an interesting, alarming sound, using two inexpensive integrated circuits plus a few other components. Operation is as follows:U1A and U1B and their associated components are configured as multivibrators, each of a selected audio frequency. . . [Designed by Arthur Harrison]

 

Delayed DC Power -  This circuit Creates a Tiny Power Delay to a Circuit. Read Why I designed it. . . [G.L. Chemelec]

 

Delayed Interface to Kodak DC-20 Camera -  . . . [Circuit designed by Jon Fick]

 

Delayed Off Light Switch -  This is an unusual design in that it uses plain metal gate CMOS logic instead of the usual PIC or a custom chip. The 22uF capacitor charges up during one half of the ac cycle, and supplies trigger current to the triac on both halves. . .  [Reverse engineered schematic by Stepan Novotill]

 

Delayed Shutter Control for Kodak DC-20 -  . . . [Circuit designed by Jon Fick]

 

Dome light dimmer (with delay) -  For all you guys out there that want a fading dome light (aka courtesy light aka theatre lighting) without having to pay for one, you can build your own. I have attached the schematics and you can build it for a few bucks given that you don't have any spare components lying around otherwise it can cost you absolutely nothing. Of course you can rip some parts from your TV, CD player, radio, etc. , but I'm not responsible for the damage you cause this way [b:e43bc460fa]The way it works[/b:e43bc460fa] I won't bother you with technical. . .

 

Fast Turn-On/Delayed-Off Relay Circuit -  Schematic only, no circuit description. . . [Designer's name not given]

 

Feedback Circuit Eliminates CCD-Driver Delay Mismatch -  09/18/03  EDN Design Idea   In a CCD (charge-coupled device], packets of charges shift across the array. The transistor array, also called a bucket-brigade shift register, receives drive from a dual-phase clock signal. Dual-phase clock signals comprise two syn. . . [by Mike Wong, Intersil-Elantec, Milpitas, CA]

 

Generating a Delayed Pulse With a dual 555 Timer -  The circuit below illustrates generating a single positive pulse which is delayed relative to the trigger input time. The circuit is similar to the one above but employs two stages so that both the pulse width and delay can be controlled. When the button is depressed, the output of the first (. . . [Bill Bowden, designer]

 

Generating Long Time Delays -  Generating long delays of several hours can be accomplished by using a low frequency oscillator and a binary counter as shown below. A single Schmitt Trigger inverter stage (1/6 of 74HC14) is used as a squarewave oscillator to produce a low frequency of about 0. 5 Hertz. The 10K resistor in series with the input (pin 1) reduces the capacitor discharge current through. . . [Bill Bowden, designer]

 

Group Delay Equalizer has Gain More than One -  10/12/95 EDN Design Idea   For numerous applications, flat group delay (linear phase) is necessary to maintain system performance. The common group-delay equalizer of Fig 1a has unity gain and is a popular way to equalize data filters or alias filters when. . . [by Mark Weigel, Scottsdale, AZ]

 

High & Low Voltage Cut Off With Time Delay -  The power line fluctuations and cut-offs cause damages to electrical appliances connected to the line. It is more serious in the case of domestic appliances like fridge and air conditioners. If a fridge is operated on low voltage, excessive current flows through the motor, which heats up, and get damaged. . . [by IQ Technologies Industry, unless otherwise noted online]

 

Long Period Computer Watch Dog Timer -  This circuit uses a simple 4060 IC oscillator/timer that is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state. The time can easily be set from seconds to hours . . . [Circuit by David Johnson P.E.,  01/01/98]

 

Low Voltage , High Current Time Delay Circuit -  . . . [Bill Bowden, designer]

 

On/Off Latch Circuit with 2 Second Delay -  A Discover Circuits visitor needed a latch circuit which could operate using a power supply voltage ranging from 3v to 24v. He wanted to use a tiny pushbutton switch to turn on and off power to a load. However, he wanted a 2 second delay between the switch activation and the state change of the output . . . [Circuit by Dave Johnson P.E.,  06/30/13]


Delay Circuits:  #'s - O     P - Z


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