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Mains Voltage Indicator - The solidstate voltmeter circuit
described here indicates the mains voltage with a resolution that is
comparable to that of a general-purpose analogue voltmeter. The status of
the mains voltage is available in the form of an LED bar graph.....
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Maintain precise timing with PC's speaker logic - 11-Jul-02
Issue of EDN Precise timing control is paramount in data acquisition
and analysis and especially in digital-signal processing. The easiest way
of maintaining timing control in a PC is to use delay loops. The
disadvantage of this implementation is that the delay loop's elapsed time
depends on the system's operating frequency..... [Design Idea by DS
Oberoi, CEDTI, and Harinder Dhingra, GCET, Jammu, India] |
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Make a DAC with a microcontroller's PWM timer - 5-Sep-02 Issue
of EDN Many embedded-microcontroller applications require generation
of analog signals. An integrated or stand-alone DAC fills the role.
However, you can often use PWM signals for generating the required analog
signals..... [Design Idea by Mike Mitchell, Texas Instruments Inc] |
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Make noise with a PIC - 7-Aug-03 Issue of EDN Building a stable noise
generator for audio-frequency purposes requires only a few components. The circuit in
Figure 1 relies on linear-feedback shift registers and some simple software. An
eight-pin Microchip (www.microchip.com] PIC12C508 controller (IC2] with a short
program generates pseudorandom noise at its output pin, GP0..... [Design Idea by Peter
Guettler, APS Software Engineering GmbH, Cologne, Germany] |
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Manipulating the Stack of the PIC18 MicroController - Microchip Application
Note Published 21-Mar-02 (app note added 2/06) |
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Mastering the PIC16C7x A/D Converter - Microchip Application Note Published
10-Apr-02 (app note added 2/06) |
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mC makes effective frequency counter - 11/23/00 EDN-Design Ideas.....Figure
1 shows an efficient and costeffective frequency counter using an Atmel 89C2051 mC
(Reference 1). The design can use any mC of the 8051 family. The circuit counts
frequency and sends the count to a PC via the serial port.....PDF has several
circuits, scroll down to find this one..... [Design Idea by Fazal Pathan, Physical
Research Laboratory, Ahmedabad, India] |
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Measure humidity and temperature on one TTL line - 30-Aug-01 Issue of EDN
By combining the responses of an Analog Devices (www.analog.com] AD590 temperature
sensor and a Humirel (www.humirel.com] HS1101 humidity sensor, you can generate a
single TTL-level signal containing information from both sensors (Figure 1].
This design uses a 74HC123 monostable multivibrator, IC1, to form a free-running
oscillator..... [Design Idea by Shyam Tiwari, Sensors Technology Pvt Ltd, Gwalior,
India] |
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Measure Tilt using PIC16F84a & Adxl202 - Microchip Application Note
Published 18-Aug-99 (app note added 2/06) |
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Measuring Characteristic Impedance of Short Rambus Motherboard Traces & Small-Outline
RIMMs - Agilent Application Note (added 6/06) |
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Meeting the Challenge of Computer System Validation - Agilent Application
Note.....[App Note] |
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Memory Address Multiplexing using 3.3V Bus Switch - Pericom Semiconductor
Application Brief # 022.....[App Note] |
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Memory Systems Multiplexing for High-Performance workstations - Pericom
Semiconductor Application Brief # 035.....[App Note] |
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Memory termination IC balances charges on series capacitors - 18-Aug-05
Issue of EDN Get the best performance from high-value capacitors with simple IC
circuit..... [Design Idea by Clayton B Grantham, National Semiconductor, Tucson, AZ;
Edited by Brad Thompson and Fran Granville] |
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Methods Link ECL & PECL - 03/02/95 EDN-Design Ideas..... EDN is migrating
links. This link is not verified. Search the "title" + "EDN" for new link.
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Micro Spy with TTL - This circuit is old (70's) but since the 74LS13 is from
the regular 74xx series and easy to obtain, I decided to keep the circuit in place
until components are no longer available. Not much to tell here. Performance is
based on the 74LS13, a 'Dual 4-input Positive-Nand Schmitt Trigger'. This
circuit was experimental and so has no real purpose other than tinkering…. [written by
Tony van Roon] |
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