Use a Trick to Count Scope Events:  01/21/99 EDN-Design Ideas  / (added 11/05)  One advantage digital storage oscilloscopes (DSOs) have over analog scopes is trace persistence. You can easily see infrequent waveform features using a scope in infinite-persistence mode. However, the frequency of these features relative to that of a "normal" signal can sometimes be less than obvious. You may wonder, does that glitch appear 10% or only 1% of the time? And how often does that short clock cycle occur? When you take trace noise into account, even a color-gradded display does not directly or accurately give the information. A histogram is the most accurate way to give the information, but it requires time and expertise. The following hint provides a quick way to determine, using a DSO, how often each of two waveforms occurs....

Use of the LMV112 to Reduce Reference Clock Interaction in Handheld Device:  National Semiconductor Application Note   (app note added 2/06)

Use time domain analysis of Zobel network:  06/27/02 EDN Design Ideas  /  (added 8/03  A Zobel network is useful in making a reactive load appear as a pure resistance to a driving source prone to stability problems (Reference 1). A typical situation is an audio power amplifier driving a loudspeaker, modeled at first approximation as an inductance and a series resistor (Figure 1a). The addition of a series R2C network in parallel with the series R1L network forms a Zobel network ......

Using Pericom's PI6C10x Pentium II/Celeron 100 MHz Clock in Place of W48S111-14:  Pericom Semiconductor Application Note # 010 (app note added 02/05)

Using the ADXL202 in Pedometer and Personal Navigation Applications:  AN-602 Analog Devices Application Notes  (app note added 6/06)

Using the LM555 Timer with Photocell Detectors:  (schematic added 8/03)

Using the Power vs Time Curve:  MicroNote 104 from Microsem Guides the reader in determining peak pulse power and peak pulse current for pulse widths of different values than those specified for a given device. (app note added 6/06)

Variable timer:  (schematic added 8/03)

VCXO makes inexpensive dual clock reference:  11/27/03 EDN Design Ideas  /  (added 1/05)  This Design Idea describes an inexpensive circuit to generate two extremely high-quality, crystal-clock-reference-signals, one of which is a PWM-controlled VCXO (voltage-controlled crystal oscillator) clock signal (Figure 1). The design also includes circuitry to statically switch and hold the VCXO at its nominal fixed frequency of operation (equivalent to 50% PWM) without requiring any external......

Versatile Timer Operates from Microseconds to Hours:  National Semiconductor Application Note 24 Feb1999 (app note added 4/02)

Video clock superimposer using PIC16C711:  (electronic circuit added 04/05)

Video Clock Superimposer:  (schematic added 8/03)

Watchdog Circuit Protects Against Loss of Battery Charger's Control Signals:  07)/21/05 EDN Design Ideas  / (added 10/05)  Hardware circuit keeps software-based charging within limits.