Tan Timer:  Six Timing positions suited to different skin types Timing affected by sunlight intensity (added 9/04)

Tanktwanger circuit puts a New spin on clock synthesis:  02/03/97 EDN-Design Feature / (added 2/06)    An unusual circuit, the "tanktwanger," provides some clock-generating and -adjusting advantages over conventional clock-synthesis methods. You can adapt the main circuit for numerous applications, but you must take care when constructing this VHF design. —Glen Chenier, Fitel Photomatrix

Telephone call meter using calculator and COB #2:  In this circuit, a simple calculator, in conjunction with a COB (chip-on-board) from an analogue quartz clock, is used to make a telephone call meter. The calculator enables conversion of STD/ISD calls to local call equivalents and always displays current local call-meter reading.
The circuit is simple and presents an elegant look, with feather-touch ....    (added 1/065)

Telephone Ringer using 555 Dual Timers:  Using modulated rectangular waves of different time periods, The circuit presented here produces ringing tones similar to those produced by a telephone. The circuit requires four astable multivibrators for its working. Therefore two 556 ICs are used here. The IC 556 contains two timers (similar to 555 ICs) in a single package. One can also assemble....   (added 10/05)

Termination Schemes and Design Guidelines for 3.3V LVPECL Driver:  Pericom Semiconductor Application Note # 07)3 (app note added 02/05)

Termination supply tracks one-half core Voltage:  04/27/00 EDN-Design Ideas / (added 2/06)

Test timer:  The output goes high for a fixed period of time when power to a unit under test (UUT) is turned on, and again when it is turned off. It was used with a magnetic sensor to test the spin-up and spin-down time of a gyroscope.  Designed by Andrew R. Morris  (added 09/05)

The Propeller a mechanically scanned LED clock :  (electronic Circuit / Schematic added 10/04)

The Science of Timekeeping:  Aligent Application Note  (added 2/06)

Time and Frequency Circuits:  (schematic added 8/03)

Time Delay Generator:  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

Time Delay Relay II:  (circuit / schematic design added 10/06)

Time Delay Relay:  (electronic schematic / circuit added 4/02)

Timed Beeper:  (circuit added 9/04)

Timekeeping Accuracy, Automatic and Affordable:  App Note 3566: Maxim IC  (application note added6/06)

Timer automatically shuts off:  08/17/00 EDN-Design Ideas  / (added 11/05)   

Timer controls DSP filter frequency resolution:  04/13/95 EDN-Design Ideas / (added 11/05)

Timer Exploits Opamp Bias Current:  07)/21/94 EDN-Design Ideas / (added 5/03) The simple, low-cost analog timer in Fig 1 exploits the parasitic input-bias current of op-amp IC1. The timer achieves long time delays even though it uses only low-value, inexpensive ceramic chip capacitors. After all, because the input-bias current is the minimum current flow into an op amp, this method produces the longest time delays possible from a given capacitor and op amp....  

Timer inputs double as interrupt-request lines :  10/08/98 EDN-Design Ideas  / (added 11/05)   

Timer Provides Power Off Function:  05/22/97 EDN-Design Ideas / (added 3/03)  

Timer Remembers Your Rhythm:  01/05/95 EDN-Design Ideas / (added 3/03)  

Timing Margin Analysis for Clock Buffers in High Speed Synchronous Networking Systems:  Pericom Semiconductor App Note # 018 (app note added 02/05)

Token passing fits large counters into CPLDs:  05/11/95 EDN-Design Ideas / (added 2/06)

Transition counter gauges thermal stability:  01/04/96 EDN-Design Ideas / (added 2/06)

Two Transistor Atomic Frequency Standard:  (schematic added 8/03)

Ultralow-cost, two-digit counter features few components:  8/17/06  EDN Design Ideas  /  (added 10/06)  Two seven-segment displays and one microprocessor count from zero to 99.

Understanding Microchip?s CAN Module Bit Timing:  Microchip Application Note Published 16-Sep-05   (app note added 2/06)

Unidirectional counters accumulate Bidirectional pulses:  04/11/02 EDN Design Ideas  /  (added 1/05)  Quadrature-output incremental optical shaft encoders are popular in high-performance, bidirectional rotation-sensing applications. Available with resolution options extending beyond 2000 EDN Design Ideas  /  (added 1/05) pulses/revolution, incremental encoders provide a fast, inexpensive, and reliable way to digitally read out bidirectional mechanical motion. ...

Universal Counter:  Typical frequency counter that built by electronics hobbyists. This counter can measure time periods and has communication interface, so that I named this "Universal Counter".  (added 6/06)

Universal Watchdog Fully Controls µ Preset:  05/25/95 EDN-Design Ideas / (added 3/03) Many µPs contain internal watchdog timers, and you may wonder why you need another stand-alone circuit. Unfortunately, more highly integrated functions have preset parameters that you may want to change. Also, internal watchdogs are generally a simple combination of a flip-flop and a timer. If the program does not start properly on the first try, the timer is of no use because the program never turns on the watchdog. This watchdog catches exactly this condition....

Use a 555 timer as a Switch mode Power Supply:  11/14/02 EDN Design Ideas  /  (added 1/05)  Most switch-mode power supplies rely on a PWM (pulse-width-modulated) output that is controlled via voltage feedback. A 555-timer IC can inexpensively perform PWM. The circuit in Figure 1 shows how to turn a 555 PWM circuit into an switch-mode power supply with only one simple equation. The design uses two 555s....