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A Weighting Filter for Audio Measurements - For noise measurements. Ideal
for use with the AC Millivoltmeter above (circuit / schematic design added 6/06)
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ABT Ratings, Specifications & Waveforms - National Semiconductor Application
Note (app note added 2/06) |
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ALD555 Oscillation Circuit - Circuit Ideas for Designers Application Notes
Advanced Linear Devices, Inc....[App Note] |
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Amplitude-stable oscillator has low-distortion, low-cost - 11/09/00 EDN-Design
Ideas....The multivibrator is a common circuit that consists of an amplifier with both
positive and negative feedback (Figure 1a).When the output is positive, the
positive….PDF contains multiple circuits, scroll to find the one of interest....
[Design Idea by Moshe Gerstenhaber, Chau Tran, and Mark Murphy, Analog Devices
Inc,Wilmington, MA] |
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An Acoustic Simulator For Headphone Amplifiers - A simple acoustic simulator
that uses shaded crossfeed to create a more realistic sound image in headphones. Based
on a design published over 20 years ago by Siegfried Linkwitz in Audio magazine, this
update has better sound and is tailored for use with headphone amplifiers….(electronic
circuit added 04/05/06) |
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An Enhanced-Bass Natural Crossfeed Filter - This project is a follow-up to
the article A DIY Headphone Amplifier With Natural Crossfeed. The author shows a
natural crossfeed filter design with a bass emphasis (similar to the Linkwitz circuit,
see An Acoustic Simulator For Headphone Amplifiers) to compensate for low-frequency
cancellation effects. Designed by Jan Meier (Circuit design added
04/05/06) |
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An Inexpensive Tone Encoder - Figure 1 illustrates an easy circuit that can
be constructed with mostly Radio Shack parts on any general purpose circuit board. The
only rigid requirement is that capacitor C1 be stable over a wide temperature range.
Use only Mylar, Polyester or Metal film for capacitor C1. The frequency is determined
by the following formula: FREQUENCY = 1/R1C1 The specified values
should allow any tone between 100 to 300 Hz. Increase R1 or add another resistor in
series with R1 for lower tone frequencies.... [Radio Amateur Society of Norwich] |
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AN-1320: Enhancing CLC031 Jitter Performance with Easy-To-Use VCXOs -
National Semiconductor Application Note (app note added 2/06) |
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AN-263: Sine Wave Generation Techniques - National Semiconductor Application
Note (app note added 2/06) |
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AN-319: Simple Interface between D/A Converter & Microcomputer Leads to Programmable
Sine-Wave Oscillators - AN-319 Analog Devices Application Notes....[App
Note] |
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AN-400: A Study of the Crystal Oscillator for CMOS-COPS - National
Semiconductor Application Note (app note added 2/06) |
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AN-419: A Discrete, Low Phase Noise, 125 MHz Crystal Oscillator for the AD9850 -
AN-419-Analog Device Application Notes....[App Note] |
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AN-666: DTMF Generation with 3.58 MHz Crystal - National Semiconductor
Application Note....[App Note] |
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AN-807: Reflections: Computations & Waveforms - National Semiconductor
Application Note (app note added 2/06) |
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AN826: Crystal Oscillator Basics & Crystal Selection for RFPIC™ & PICmicro® Devices
- Microchip Application Note Published 17-Jan-02 (app note added 2/06)
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Analog switch converts 555 timer into pulse width modulator - 15-Feb-07
Issue of EDN Added CMOS switch enhances a PWM oscillator.... [Design Idea by
Jordan Dimitrov, Tradeport Electronics, Vaughan, ON; Edited by Brad Thompson and Fran
Granville, Canada] |
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AN-H24: Expected Voltages & Waveforms - Supertex Semiconductors (app
note added 2/06) |
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Archery timer - (circuit / schematic added 6/05) |
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Astable Mode Operation 50% Duty Cycle - Circuit Ideas for Designers
Application Notes Advanced Linear Devices, Inc....[App Note] |
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Astable Mode Operation Free Running Oscillator - Circuit Ideas for Designers
Application Notes Advanced Linear Devices, Inc....[App Note] |
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Audio Frequency Digital Noise Generator - When you need to test an audio
circuit with broadband noise, this circuit works great. It uses just three inexpensive
C-MOS ICs that generate a series of output pulses whose widths vary randomly. I
included a level control pot. …. [Designed by David A. Johnson] |
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Audio LED VU meter - Audio level meter circuits are fairly often requested.
The circuit was designed to work with an audio power amplifier which operated off
+18v-0v-18v power rails. The actual voltage used is not too critical except that the
feedback is referred to the LED chain which itself is anchored to a +12v rail, hence
the separate stabilizer for this. It has one large advantage over most of the LED
chips available - all the LEDs are in series so it only draws 20mA irrespective of the
number of LEDs illuminated....[4QD-TEC: Electronics Circuits Reference Archive]
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Audio Test Oscillator - As a piece of test equipment, an audio oscillator
has to be considered essential for anyone working in with hi-fi gear. Together with an
audio millivoltmeter (as described in Project 16), and even better if you have access
to an oscilloscope, you will be able to make proper measurements on everything from
preamps, RIAA equalisation stages (for vinyl disks), tone controls, crossover
networks, etc....(circuit / schematic added 2/03) |
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Automated RF Path Characterization in Mobile Phone Test Systems - Agilent
Application Note (added 6/06) |
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Band-pass Network - Circuit Ideas for Designers Application Notes Advanced
Linear Devices, Inc....[App Note] |
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Basic RF Oscillator #1 - This basic circuit is eash to build and the
components are not critical. Most of them can be found in your junk parts
box…. [Tony van Roon's circuit] |
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Basics of Oscillators - Sohpomore Physics Laboratory California Institute of
Technology, July 2003 (added 02/05) |
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Bipolar current-source maintains high output impedance at high frequencies -
5-Dec-05 Issue of EDN Use line-receiver/amp ICs to build high-frequency
constant-current sources.... [Design Idea by Alex Birkett, University College London,
Hospital National Health Service, London, UK; Edited by Brad Thompson and Fran
Granville] |
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Bluetooth RF Measurement Fundamentals: Application Note 1333-1 - Agilent
Application Note....[App Note] |
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Build a simple complementary-bracket-pulse generator - 20-Aug-09 Issue of
EDN When building push-pull switching power converters or motor controllers, you
often need alternating pulses with a small amount of dead time between them to
minimize simultaneous conduction in output-switching devices. Switching controller ICs
have this feature, but they usually operate.... [Design Idea by Horst Koelzow, Global
Thermoelectric, Calgary, AB, Canada] |
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Bus request Signal generates logic waveforms - 06/20/96 EDN-Design
Ideas....The scheme in Figure 1 generates accurate and repeatable logic sequences—even
in presence of interrupt activity. Specifically, circuit generates 16-bit
logic sequences with a resolution of 100 nsec. This circuit's repeatability is
an advantage compared with or sequence-generation methods.... [Design Idea by
Dhananjay Gadre, IUCAA, Pune, India] |
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