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Power Resumption Alarm
circuit - Here is a simple power resumption alarm circuit
that can be fixed inside the switch box itself. It gives beeps when the power resumes after a power failure. This
circuit is ideal to monitor battery chargers, since the long duration power failure may sometimes remain
unnoticed. The circuit is too simple and derives power supply. . . [Circuit Posted by D Mohankumar]
Powering A Project Negative
Voltage - The safest way to power a project is with a
battery. Use 4 x AA cells in a holder or a 9v battery if you only want to use the project for a short period of
time. If you want to use a 555 project for a long period of time you will need a "power supply. ". . . .
[Designer's name is not given}
Power-Up Reset for Monostable Timers - 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]
Precisely
measure settling time to 1 ppm - 03/04/10 EDN Technical
Article: Intense, extensive, and protracted effort yields a measurement circuit with 20-bit resolution.
nstrumentation, function generators, inertial navigation systems, ATE (automatic test equipment), medical
apparatus, and other precision applications now require 18-bit converters. The resolutions of these converters
are so precise that measuring various performance parameters is difficult. DACs’ dc specifications are relatively
easy to verify, but their ac specifications require more sophisticated approaches to produce reliable
information. A DAC’s settling time is the elapsed time from an input code application until the output remains
within a specified error band around the final value. . . . [by Jim Williams, EDN's most revered contributor-At
63 years of age, Williams passed away in June 2011 after a stroke.]
Precision
1Hz Clock - This precision 1Hz clock uses just two ICs and
one junction field-effect transistor (JFET) in conjunction with a commonly available crystal and a handful of
other passive components. . . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]
Precision 1Hz Clock
Generator using Chip on Board - . . .
Precision Metronome and
Pitch generator - . . . [by IQ Technologies Industry,
unless otherwise noted online]
Precison 1Hz
Clock Generator Using Chip-On-Board - This is a circuit
that generates 1 Hz clock pulse using COB and a op-amp. . . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]
Prescaler with Counter - Digital frequency counter is being used for wide range of applications. Digital frequency
counter extensively uses digital circuits and hence fairly good knowledge of digital circuits and of digital
integrated circuits is required to understand the operation of the frequency counter. However a person who is not
familiar with any electronics circuits and experiments has in written this article. . . .
Press and
Hold Latching Circuit - A Discover Circuits visitor
needed a latch circuit which could operate using a power supply voltage ranging from 3v to 24v. He wanted to use
a tiny pushbutton switch to turn on and off power to a load. However, he wanted a 2 second delay between the
switch activation and the state change of the output . . . [Hobby Circuit designed by David Johnson P.E.,
06/30/13]
Procedure for DDR Clock SkeW & Jitter
Measurements - Application Note # 028. . . [Pericom
Semiconductor]
Programmable Clock Oscillator
- PIC-Tock video clock using a PIC16C61. . . [Circuit designed by Eric Smith]
Programmable digital timer
switch using a PIC Microcontroller - Digital timer
switches are used to control the operation of electrical devices based on a programmed schedule. This project
describes a programmable digital timer based on a PIC16F628A microcontroller from Microchip that can be. . .
Propellor clock
PIC16F84 - A few light emitting diodes spin, precisely
controlled by a PIC microprocessor, giving the illusion of a larger array. . . . [Bob Blick's design]
Provide Automatic Power-Off for Batteries - 05/13/04 EDN Design Idea The circuit in Figure 1 provides a simple and inexpensive way to
protect one of the most valuable components in portable applicationsthe battery. Applications include all
portable equipment that requires a limited time of operati. . . [by Miguel Gimenez, Altair-Equipos Europeos
Electronicos, Madrid, Spain]
Provide Watchdog for Microcontrollers - 12/26/02 EDN Design Idea The watchdog circuit in Figure 1 uses a single NAND
Schmitt-trigger IC. The circuit iscost-effective than dedicated, commercially available watchdog ICs. The circuit
generates an active-high reset signal upon power-up and remains i. . . [by VM Holla, Bangalore, India]
Provides Linear Resistance-To-Time Conversion - 08/07/03 EDN Design Idea Resistance-based transducers, such as strain gauges and
piezoresistive devices, find common use in the measurement of several physical parameters. For applications in
which digital processors or microcontrollers serve for data acqui. . . [by S Kaliyugavaradan and D Arul Raj,
Anna University, Chennai, India]
Provides Serial or Sequential Timing - 09/26/96 EDN Design Idea In this design, you can adjust as many as eight time intervals,
and repeated operation is optional. You can use the timer to control the external load either serially or
sequentially, depending on the application. The basic timer uses a 4060 (IC4) with a fixed timing capacitor. The
analog switches connect the timing resistors to the circuit. A five-stage Johnson counter, IC1, controls the
analog switches. . . . [by Sanjay R Chendvankar, Tata Institute of Fundamental Research, Bombay, India]
Provides Timebase Calibration
- 04/24/97 EDN Design Idea The circuit in Figure 1 provides an inexpensive and quick way to check the timebase
speeds and linearity in vintage oscilloscopes. Component aging in the oscilloscopes sometimes alters the timebase
parameters enough to yield grossly erroneous results. You can make timing adjustments in the oscilloscope by
using the timing waveforms from the circuit in Figure 1. You can power the circuit from any suitable lab supply
or from a 9V battery if you need a stand-alone calibrator. One section of a 74HCT04 (IC1) is configured as a
1-MHz, crystal-controlled oscillator. A 74HCT74 (IC2) provides two divide-by-2 counters that provide the 500- and
250-kHz outputs. . . . [by William Whitehead, Lafayette, CO]
Provides Watchdog for Microcontrollers - 12/26/02 EDN Design Idea The watchdog circuit in Figure 1 uses a single NAND
Schmitt-trigger IC. The circuit iscost-effective than dedicated, commercially available watchdog ICs. The circuit
generates an active-high reset signal upon power-up and remains i. . . [by VM Holla, Bangalore, India]
Provisionary Data Rates using the AD9951 DDS as an Agile Reference Clock for the ADN2812 Continuous-Rate CDR - AN-632 Analog Devices App Note. . .
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