Timers and Counters Circuits, Page 5
Timers & Counters:
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Last Updated on:
Friday, March 12, 2010 12:07 PM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Tan Timer: Six Timing positions suited to different skin types Timing
affected by sunlight intensity (added 9/04) |
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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 |
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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) |
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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) |
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Termination Schemes and Design Guidelines for 3.3V LVPECL Driver:
Pericom Semiconductor Application Note # 07)3 (app note added 02/05) |
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Termination supply tracks one-half core Voltage: 04/27/00 EDN-Design
Ideas / (added 2/06) |
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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) |
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The Propeller a mechanically scanned LED clock : (electronic Circuit /
Schematic added 10/04) |
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The Science of Timekeeping: Aligent Application Note (added 2/06) |
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Time and Frequency Circuits: (schematic added 8/03) |
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Time Delay Generator: Circuit Ideas for Designers Application Notes
Advanced Linear Devices, Inc. (app note added 6/06) |
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Time Delay Relay II: (circuit / schematic design added 10/06) |
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Time Delay Relay: (electronic schematic / circuit added 4/02) |
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Timed Beeper: (circuit added 9/04) |
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Timekeeping Accuracy, Automatic and Affordable: App Note 3566: Maxim IC
(application note added6/06) |
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Timer automatically shuts off: 08/17/00 EDN-Design Ideas / (added
11/05) |
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Timer controls DSP filter frequency resolution: 04/13/95 EDN-Design Ideas /
(added 11/05) |
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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.... |
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Timer inputs double as interrupt-request lines : 10/08/98 EDN-Design Ideas
/ (added 11/05) |
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Timer Provides Power Off Function: 05/22/97 EDN-Design Ideas / (added 3/03)
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Timer Remembers Your Rhythm: 01/05/95 EDN-Design Ideas / (added 3/03) |
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Timing Margin Analysis for Clock Buffers in High Speed Synchronous Networking Systems:
Pericom Semiconductor App Note # 018 (app note added 02/05) |
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Token passing fits large counters into CPLDs: 05/11/95 EDN-Design Ideas /
(added 2/06) |
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Transition counter gauges thermal stability: 01/04/96 EDN-Design Ideas /
(added 2/06) |
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Two Transistor Atomic Frequency Standard: (schematic added 8/03) |
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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. |
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Understanding Microchip?s CAN Module Bit Timing: Microchip Application Note
Published 16-Sep-05 (app note added 2/06) |
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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. ... |
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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) |
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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.... |
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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.... |
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