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Unidirectional counters accumulate bidirectional pulses - 11-Apr-02 EDN Design Idea Quadrature-output incremental optical shaft encoders are popular
in high-performance, bidirectional rotation-sensing applications. Available with resolution options extending
beyond 2000 pulses/revolution, incremental encoders prov. . . [by Stephen Woodward, University of North
Carolina, Chapel Hill, NC]
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". . . . [The Electronic Lives
Manufacturing-presented by Chan]
Universal Timer with Zero Standby Current - This design came about when the author wanted better control of his 12 V solar-charged
garden lighting installation. It is however a versatile circuit which can also be used to switch other types of
equipmentmust register on this site. . . [Published in Elecktor July/Augu, 2010]
Universal Watchdog Fully Controls µ Preset - 05/25/95 EDN Design Idea 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 . . . [by Terje Kvinge, Nera AS, Kokstad, Norway]
Unusual clock with AT89C2051
- . . . [English version link]
Up/ Down Digital Counter With 7
Segment LED Displays - REVISED Really as Simple as you
can get and has 4 Displays. . . [G.L. Chemelec]
Up/Down Fading LED - These two circuits make a LED fade on and off. The first circuit charges a 100u and the
transistor amplifies the current entering the 100u and delivers 100 times this value to the LED. . . . [No
designer name given]
Use a 555 timer as a switch-mode power supply - 11/14/02
EDN Design Idea 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 . . . [by Aaron Lager, Masterwork Electronics, Rohnert Park, CA]
Use a
trick to count scope events - 01/21/99 EDN Design Idea
(contains several designs, scroll to find this one) 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? . . . [by Allen Montijo, Hewlett-Packard, Colorado Springs, CO]
Use Eight Timers With PIC16Fxxx Microcontrollers - 02/18/10 EDN Design Idea Timers debounce switches and let you decide when lapses have
expired. . . [by Luis G Uribe C, Caracas, Venezuela]
Use of the LMV112 to Reduce Reference Clock
Interaction in Handheld Device - Application Note. . .
[National Semiconductor]
Use Thermostat as 12 Volt
Timer - Find out how an old battery powered thermostat can
be used as a low voltage automatic timer. . . . [REUK-Renewable Energy UK website]
Use
time-domain analysis of Zobel network - 06/27/02 EDN
Design Idea 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 a. . . [by Noël Boutin, Université de Sherbrooke, PQ, Canada]
Using 555 Timer as an A/D
Converter - Measure voltages accurately with a
microcontroller using this simple circuit. Includes sample program for the Parallax Basic Stamp. . . . [Bob
Blick's design]
Using Pericom's PI6C10x Pentium
II/Celeron 100 MHz Clock in Place of W48S111-14 -
Application Note # 010. . . [Pericom Semiconductor]
Using the 555 Timer With Photocells - This page shows three circuits for using the 555 timer IC as a photocell controlled train
detector. Scroll down for this circuit design. Circuit for model railroad trains. . . . [from Rob Paisley's
Model Train web site]
Using the
ADXL202 in Pedometer & Personal Navigation Applications -
AN-602 Analog Devices App Note. . .
Using the LM555 As A Voltage Comparator
or Schmitt Trigger - Uses the LM555 timer or its cousins
with other letter prefixes. There can be minor differences between 555 timer IC's from different manufacturers
but they all should be useable for any circuit. Designed for Model Trains. . . . [from Rob Paisley's Model Train
web site]
Using the Power vs Time Curve - MicroNote 104 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. . . . [Microsemi Corp]
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