Butterworth Filter has Adjustable Group Delay:  08/08/02 EDN Design Ideas  /  (added 1/05)  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, this filter has an insertion loss greater than 20 db at 13.5 MHz and greater than 40 db at 27 MHz (Figure 2)....

Delay Line Aids in One Shot Simulations:  02/05/2004  EDN-Design Ideas  In low-noise analog circuits, a high-gain amplifier serves at the input to increase the SNR. The input signal level determines the input-stage gain; low-level signals require the highest gain. It is also standard practice in low-noise analog-signal processing to make the circuit's bandwidth as narrow as possible to pass only the useful input-signal spectrum. (added 10/05)

Delay Line Eases SPICE Dead Time Generation:  02/05/2004  EDN-Design Ideas  In low-noise analog circuits, a high-gain amplifier serves at the input to increase the SNR. The input signal level determines the input-stage gain; low-level signals require the highest gain. It is also standard practice in low-noise analog-signal processing to make the circuit's bandwidth as narrow as possible to pass only the useful input-signal spectrum. (added 10/05)

Delay Line has Wide Duty Cycle Range:  06/27/02 EDN Design Ideas  /  (added 1/05)  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 per tap) further limits their use. Longer delay is available with one-shot multivibrators of standard digital-logic families, but those devices do not retain duty-c......

Delay Line Implements Clock Doubler:  07)/18/96 EDN-Design Ideas / (added 3/03)  

Delay Line Upgrades Vintage Scope:  04/18/02 EDN Design Ideas  /  (added 1/05)  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 insufficient delay to display such pulses during a uniform portion of the sweep. ...

Delay Simulator Debugs Communications Equipment:  10/27/94 EDN Design Ideas  / (added 08/05)  Phone calls over satellite circuits experience a ¼-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 impairments. Designers debugging modems, fax machines, and other communication equipment can use this circuit to troubleshoot handshake timing and connection problems caused by transmission delays.

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.  (added 2/05)

Delayed Shutter Control for Kodak DC-20:  (circuit / schematic design added 6/06)

Feedback Circuit Eliminates CCD Driver Delay Mismatch:  09/18/03 EDN Design Ideas  /  (added 1/05)  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 synchronized clock signals that are 180° out of phase. High peak-output-current CCD drivers can buffer the logic-level clock signals and turn them into high-voltag......

Generating a Delayed Pulse With a dual 555 Timer:  (schematic / circuit added 2/07)

Generating Long Time Delays (circuitdb):  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.... (added 2/07)

Generating Long Time Delays:  (circuit / schematic design added 6/06)

Group Delay Equalizer has Gain More Than One:  10/12/95 EDN-Design Ideas  / (added 6/06)      

High and Low Voltage Cutout with Delay and Music:  Voltage variations and power cuts adversely affect various equipment such as TVs, VCRs, music systems and refrigerators. This simple circuit will protect the costly equipment from high as well as low voltages and the voltage surges (when power resumes). It also gives a melodious tune when mains power resumes. When mains voltage is normal,.....   (added 10/05)