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Stopwatch 0-60sec - In the present article, we will describe the function of a digital stopwatch, 0 – 99 sec.
The function of the stopwatch, relies in the use of 4 integrated circuits, which in this case belong to National
Semiconductor (http://www. national. com). It is obvious that other integrated circuits can be used to achieve
the same result, however in this case we have used the following parts. . . [designed by Pafilis Ioannis -
Aristotle University of Thessaloniki Department of Electronics and Telecommunications]
Stopwatch Based on MCP79410 I2C RTCC - AN1379 - Technology Inc. . . . [Microchip App Note last updated on 9-May-11]
Sun tanning timer - . . . [Flavio Dellepiane's web site]
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) . . . [Randy Linscott]
Super Low Distortion Variable Sine Wave Oscillator - The LT1028 (gain of –1 stable) /LT1128 (gain of +1 stable) achieve a new standard of
excellence in noise performance with 0. 85nV/rtHz 1kHz noise, 1. 0nV/rtHz 10Hz noise. This ultralow noise is
combined with excellent high speed specifications (gain-bandwidth product is 75MHz for LT1028, 20MHz for LT1128)
, distortion-free. . . [Linear Technology App Note, Jun 21, 2011]
Super Simple Counter - Super Simple Counter The freebie metal detector I previously designed for [url=http://www.
thomasscarborough. blogspot. com/]this blog[/url] is by far my most popular post. So here is another circuit I
designed today. Counters must be among the more sought-after electronic circuits. However, even the simplest of
them are complex. This provides a "super simple" solution, to count from 0 to 43, 200 on a quartz clock face (60
seconds × 60 minutes × 12 hours). It would be capable e. g. of counting attendance at most major public events.
Almost any cheap analogue quartz clock is used for the. . .
Supporting
FDDI with the ADN2812 - AN-746 Analog Devices App Note. .
.
Sweeping Output Siren - 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]
Switch Debounce - The output goes HIGH for 100mS when the switch is pressed. . . . [No designer name given]
Switch Debounce using
555 - Schematic only, no text included. . .
Synchronized Timing Generators
- Circuit Ideas for Designers App Note. . . [Advanced Linear
Devices, Inc]
Synchronizing Device
Clocks Using IEEE 1588 & Blackfin Embedded Processors -
Analog Devices-Analog Dialogue. . . [by Peloquin, Robert]
System implements digital clock modulation - 10/28/04 EDN Design Idea 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 cod. . . [by Dan Doberstein, DKD Instruments,
Nipomo, CA]
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