Power and Thermal Considerations for High Speed Clock Generators:  National Semiconductor Application Note   (app note added 2/06)

Power on Time Delay Relay Circuit:  (schematic added 8/03)

Precision 1Hz Clock Generator using Chip on Board:  (electronic Circuit / Schematic added 10/04)

Procedure for DDR Clock Skew and Jitter Measurements:  Pericom Semiconductor Application Note # 028 (app note added 02/05)

Programmable Clock Oscillator #1:  PIC-Tock video clock using a PIC16C61.  Voltage controller oscillator that was designed as a wide range oscillator to generate clock pulses for a stepper motor drive system, frequency could be varied over1,000,000:1 (added 4/02)

Programmable Clock Oscillator #2:  PIC-Tock video clock using a PIC16C61 (added 4/02)

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

Propellor clock (PIC16F84):  a few light emitting diodes spin, precisely controlled by a PIC microprocessor, giving the illusion of a larger array. (added 8/03)

Provisionary Data Rates using the AD9951 DDS as an Agile Reference Clock for the ADN2812 Continuous-Rate CDR:  AN-632 Analog Devices Application Notes  (app note added 2/06) 

PWM Watchdog Circuit Ensures upper Bounds:  11/07)/96 EDN-Design Ideas / (added 8/03)

Quad Astable Mode Operation (Free Running Oscillator):  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

Quad Monostable Mode Operation (One Shot Pulse):  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

Radio clock for PC's:  (electronic circuit added 04/05)

Real Design Issues for Clock Buffers for Networking and PC Applications:  Pericom Semiconductor Application Brief # 025 (app note added 02/05)

Realtime clock Chip Makes Lowpower Oscillator:  11/23/00 EDN-Design Ideas / (added 8/03)  Many systems use watch-crystal-based, 32.768-kHz oscillators. In battery-powered designs, the 32-kHz oscillator may consume a fairly high percentage of the total power budget. Reduced power consumption equates to longer battery life, smaller batteries, and smaller products. Ricoh (www.ricoh.com) manufactures more than 10 types of real-time-clock chips, including the RS5C372B (Figure 1). This device is an eight-pin IC with a built-in oscillator, programmable periodic interrupts, and an I2C interface to a µC. The only function the device in Figure 1 uses is the 32-kHz oscillator. Using only the IC and the crystal, the circuit consumes low current over its 1.5 to 6V power-supply range, as the table in Figure 1 shows. The CMOS-based output delivers a waveform with an amplitude of 0V to VDD.... 

Receiving Remote Control Signal using Externally Triggered Timer:  Toshiba 870X Series Application Note  (app note added 2/06)

Rules of Thumb Aid in Timeconstant Analysis:  11/06/97 EDN-Design Ideas / (added 2/05)  

Scan Bridge   (STA111/STA112) Timing:  National Semiconductor Application Note   (app note added 2/06)

Schematic and Layout Guidelines for PI6CV304/PI6CV2304:  Pericom Semiconductor Application Note # 054 (app note added 02/05)

Scheme Provides Automatic Power Off for Batteries:  05/13/04 EDN Design Ideas  /  (added 1/05)  The circuit in Figure 1 provides a simple and inexpensive way to protect one of the most valuable components in portable applications: the battery. Applications include all portable equipment that requires a limited time of operation, such as test instruments, guitar tuners, and electronic toys. Pressing the on/off momentary switch starts the cycle, and the circuit provides power to the applic......

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

SDRAM Modules using Pericom's Products:  Pericom Semiconductor Application Brief # 015 (app note added 02/05)

Shower Stopper:  (schematic added 8/03)

Simple 6 Digit 40MHz Frequency Counter Module:  Here is the design for a very low cost 6-digit frequency counter module using of the shelf components (and not that expensive 74C926!). The standard circuit will display directly in Hz (1MHz max), and there is a separate on board divider that will allow you to display directly in KHz (approx 40MHz max). Because the display reads directly in Hz or KHz there is no need for decimal point switching and the associated complexity. There are no switches or controls, simply feed the signal into one of two inputs and you have a direct readout in Hz or KHz. This circuit is ideal for adding a low cost frequency display to a function generator or other design. I doubt if it is possible to get a cheaper design using off the shelf components!. In fact, I challenge anyone to make a cheaper design using garden variety components!....  (add 11/05)

Simple Choc Block Supply:  A very simple adjustable power supply can be built on a single piece of chocolate block based on the L200CV IC. The output is variable between 0 and 30V, with an adjustable current limit up to 2 amps. (added 10/06)

Simple Circuit Provides Timebase Calibration:  04/24/97 EDN-Design Ideas / (added 3/03)  

Simple circuit times bathroom fan:  04/27/00 EDN-Design Ideas / (added 11/05)

Simple Divide by N using '161s:  (schematic added 8/03)

Simple phototimer Controls load:  04/18/02 EDN Design Ideas  /  (added 1/05)  In industrial and home applications, the need sometimes exists for a device that, after activation by some physical effect, such as light, temperature, or sound, switches a load on for a predetermined time. The load, such as a lamp, motor, solenoid, or heater, usually derives its power from the ac line. ...

Simple 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....  

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

Simplified Analysis of Phase-Locked Loop Capture and Tracking Range (AN 1200-7):  Agilent Application Note   (added 6/06)

Single Gate Synchronizes Clock:  10/27/94 EDN-Design Ideas / (added 11/05)  The deceptively simple circuit in Fig 1 harbors formidable power. Consider when you have a data-clock input to your system for an existing serial data stream. Then, your system people surprise you with a new serial data source after your real-estate budget is used up. You can synchronize the new signal to the clock and assign the data to an unused input bit without unduly burdening your software engineers. But, if the gadget that supplies the data clock goes haywire, your new signal dies with it; that is, unless you supply the clock and synchronize it to the functioning existing clock by using a spare inverter.... 

Sleep Switch Cum Wake up Timer:  (electronic Circuit / Schematic added 10/04)

Slot Car TV Chronograph:  (electronic circuit added 09/05)

Slow diodes or handy timing devices?:  09/16/04 EDN Design Ideas  /  (added 1/05)  Most designers consider slowness in diodes to be an imperfection or a limitation. Why not take a more positive view of the situation? After all, a zener or an avalanche diode is no more than a diode with a limited breakdown voltage, and you can view a varactor as a diode with a large and nonlinear parasitic capacitance....

Solution for PC100 CompliAnt Modules:  Pericom Semiconductor Application Brief # 017 (app note added 02/05)

Solutions to Current High-Speed Board Design:  Pericom Semiconductor Application Note # 022 (app note added 02/05)

Special Function Timer Circuits (LM555):  (diagram added 05/07)

Speed test times by utilizing the built-in features of your frequency counter:  Agilent Application Note   (app note added 6/06)

Square wave oscillator with fixed frequency steps using 555 timer chip:  (diagram added 05/07)

Square Wave to Sine Converter:  (circuit / schematic added 2/03)

Stable 40KHz Clock:  (schematic added 8/03)

Stable Multivibrator (IC):  (app note added 8/03)

Stable Multivibrator (Transistor):  (app note added 8/03)

State and Timing Modules for Agilent Technologies Logic Analysis Systems:  Agilent Application Note   (added 6/06)

Sun tanning timer:  (electronic circuit added 04/05)

Sun Up Alarm:  The Sun Up Alarm can be used to provide a audible alarm for when the sun comes up or it can be used in a dark area and detect when a light comes on. It can also be used to detect a light beam, headlights etc. The circuit works as follows. The phototransistor is very sensitive to light. (Any phototransistor will work fine) The sun shining on this device will provide a high to one of the NAND gates. This will cause another NAND gate to oscillate which will drive another gate to output a100hz tone. The transistor provides drive for the speaker. (added 3/03)

Supporting FDDI with the ADN2812:  AN-746 Analog Devices Application Notes  (app note added 2/06) 

Switch Debounce using 555:  (schematic added 8/03)

Synchronized Timing Generators :  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

System implements digital clock modulation :  10/28/04 EDN Design Ideas  / (added 11/05)  In spread-spectrum and direct-sequence receivers, it's often necessary to change the frequency of the clock oscillator, and thus the spreading-code clock, to lock the receiver's reference pseudorandom-noise code to the incoming code. The original design used a VCXO (voltage-controlled crystal oscillator) for this function, but this revised design implements an all-digital method that provided a...