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Rectangular waveform generator produces 25 and 75% duty-cycles -
03/18/10 Issue of EDN Use two ICs to produce both waveforms… [Design
Idea by Marián Stofka, Slovak University of Technology, Bratislava,
Slovakia] |
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Reflections: Computations & Waveforms - National Semiconductor
Application Note (app note added 2/06) |
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RF oscillator uses current-feedback op amp - 3-Oct-02 Issue of EDN
A current-feedback amplifier is a well-known component with many uses. Its
basic block diagram shows that its input stage is a voltage follower—in
practice, a symmetrical emitter follower (Figure 1). The configuration
samples the... [Design Idea by Victor Koren, Tioga Technologies Ltd, Tel
Aviv, Israel] |
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Sawtooth Generator Spans a 70 DB Range - 07/07/94 EDN-Design
Ideas....The circuit in Fig 1 demonstrates a simple method for generating a
voltage-programmable sawtooth waveform having a dynamic range greater than
70 dB. In addition to the sawtooth waveform, the circuit also produces
corresponding triangle- and square-wave outputs. The three ICs and
associated components.... [Design Idea by Paul Hendricks, Analog Devices,
Wilmington, MA] |
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Sawtooth to Triangle converter - This wave shaper needs an input saw that
goes from Vss to (ideally) Vdd. It works well with the 4069 VCO designed by René
Schmitz. Any saw will work as long as the wave is centered halfway between the rails.
It works as follows: The upper set of 2 linear mode gates....(added 05/08)
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Sawtooth Wave Oscillator - (app note added 8/03) |
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Scheme yields Frequency Locked Triangle Waves - 02/02/98 EDN-Design
Ideas....The circuit in Figures 1 and 2 generates frequency-locked triangle waves of
constant amplitude. It uses readily available TTL and other older-technology parts.
The circuit portion in Figure 1 comprises the frequency dividers, counters, and
converter. The portion in Figure 2 contains current sources, output circuits,....
[Design Idea by Daniel Dufresne, Decatron, St Bruno, PQ, Canada] |
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Self Oscillating Amplifier for Distortion Testing - allows the home
constructor to make quite accurate measurements, without having to spend a lot of
money on a low distortion oscillator (added 5/02) |
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Signal Controls Sine Generator - 05/15/03 EDN-Design Ideas....The circuit of
Figure 1 produces an accurate, variable-frequency sine wave for use as a
general-purpose reference signal. It includes an eighth-order elliptic,
switched-capacitor lowpass filter, IC3, which uses a 100-kHz square-wave clock signal
that microcontroller IC2 generates. (Any other convenient square-wave source is also
acceptable.... [Design Idea by Simon Bramble, Maxim Integrated Products, UK] |
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Signals Produce Pure Sine Waves - 10/09/97 EDN-Design Ideas.... Analog
oscillators produce excellent sine waves but are temperamental and hard to design.
They also require extensive redesign every time you change the oscillation frequency.
Digital oscillators are easier to design than analog oscillators, and digital signals
already exist in digital systems. Thus, it is often cost-effective.... [Design Idea by
Ronald Mancini, Harris Semiconductor, Melbourne, FL] |
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Simple 1.5V Square Wave Generator - This simple circuit generates a good and
stable 1V peak-to-peak square wave at 100Hz, 1KHz and 10KHz using a single 1.5V cell
as power supply. An useful feature of this circuit is that frequency changes can be
obtained by switching only one capacitor at a time. Current consumption is about
600µA. * If a precise 50% duty-cycle is needed, trim R1 and monitor the output wave
form by means of an oscilloscope. * A good 500mV peak-to-peak square wave is provided
even at 1V supply. ….(electronic schematic added 11/08) |
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Simple Circuit Generates Clean Sine Waves - 06/19/97 EDN-Design
Ideas....Generating a square wave at a particular frequency is fairly simple. Many
techniques for doing so exist, using counters, flip-flops, and--everyone's
favorite--the venerable 555 timer. Generating a sine wave, however, is not nearly as
simple or inexpensive. Figure 1 shows a technique for generating a high-quality sine
wave from a square-wave source.... [Design Idea by Med Dyer, Jabra Corp, San Diego,
CA] |
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Simple Compensation Extends Oscillator's Range - 12/05/96 EDN-Design
Ideas....A simple technique provides phase compensation for the oscillator in Figure
1a. In this circuit, a tungsten lamp regulates the amplitude of a crystal bridge
oscillator. This type of oscillator produces a very low-distortion output at a
very stable frequency. The op amp must have a.... [Design Idea by Israel Schleicher,
Green Spin, Bakersfield, CA] |
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Simple sine synthesizer generates 19 kHz pilot tone for FM baseband signal -
14-Apr-05 Issue of EDN Low distortion, single-frequency sine source for stereo
FM.... [Design Idea by Carlos Bernal and Diego Puyal, Departamento Ingeniería
Electrónica y Comunicaciones, Universidad de Zaragoza, Zaragoza, Spain; Edited by Brad
Thompson] |
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Simple Squarewave Generator - Three switchable frequencies: 100Hz, 1KHz,
10KHz 1.5V battery operated, minimum parts counting (added 3/05) |
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Sine reference is synchronous with AC line - 02/15/00 EDN-Design Ideas EDN
is migrating links. This link is not verified. Search the "title" + "EDN" for
new link. |
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Sine Synthesizer Generates 19 kHz Pilot Tone for FM Baseband Signal -
04/14/05 EDN-Design Ideas....A multiplex signal comprises baseband information
transmitted on a stereo analog FM-broadcast system, plus one or more SCA (Subsidiary
Communications Authorization]channels (Figure 1). This Design Idea presents a
low-cost method of generating.... EDN is migrating links. This link is not verified.
Search the "title" + "EDN" for new link. |
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Sine Wave Generation Techniques-AN263 - National Semiconductor Application
Note 04-Nov-1995 (app note added 2/03) |
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Sine Wave Generator (Andy Collison) - A classic Wien Bridge oscillator using
an Op-Amp covering a frequency range of 15 to 150kHz in four switched
steps…..(electronic schematic / circuit added 4/02) |
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Sine wave generator outputs precise periods - 04/26/01 EDN-Design
Ideas....Rectangular pulse generators, even at high frequencies, are easy to design.
However, the design becomes more difficult if you need a signal that contains….
[Design Idea by JM Terrade, Clermont-Ferrand, France] |
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Sine Wave Oscillator - Here is a simple Sine Wave Oscillator
Circuit....(design added 12/08) |
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Sine wave step up converter uses Class E concept - 17-Feb-05 Issue of EDN
Many power applications ranging from luminescent and fluorescent lighting to
telephone-ringing voltage generators require aor less sinusoidal-drive voltage. These
applications typically require a waveform of only moderate quality, and its frequency
isn't especially critical. However, avoiding waveform discontinuities that cause
unwanted current peaks, excessive device dissipation, and EMC.... [Design Idea by
Louis Vlemincq, Belgacom, Evere, Belgium] |
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Sinewave Generation Techniques - I recently discovered an interesting
application note from National Semiconductor in October of 1999. The article details
nine sine wave generation techniques. Some techniques can be accomplished several ways
so there are more than nine circuits available.... |
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Single IC forms precision triangular wave generator - 04/08/10 Issue of EDN
Generate a triangular wave for testing other circuits.… [Design Idea by Akshay Bhat,
Maxim Integrated Products Inc, Sunnyvale, CA] |
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Sinusoid generator uses dual-output current controlled conveyors - 22-Jan-09
Issue of EDN You can design sine-wave oscillators without resistors, which
improves on power consumption.... [Design Idea by Abhirup Lahiri, Netaji Subhas
Institute of Technology, New Delhi, India] |
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Smooth Tone Clickless CW SideTone Generator - This circuit is about as good
as it gets for generating morse code tones. It may be used as a code practice
oscillator, a tone generator for a keyer, a sidetone oscillator for a CW transmitter
or an audio Modulated CW (MCW) generator for an FM transmitter or repeater.... [G.
Forrest Cook] |
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Soft On/Off Switch - Modern electronic equipment incorporate
"push-to-on-push-to-off" switches that do not make noise as with old equipment. An
example of this is the power button on a ATX computer cabinet. Here is a circuit that
does the same. It can be used to turn on/off(added 14/02) |
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Spot-frequency Sine Wave Generator - 300Hz, 1KHz, 3KHz "output stable" test
equipment tool. 9V battery powered portable unit (added 3/05) |
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Square Wave Oscillator - It has adjustable (and settable) frequencies from
1Hz to 100kHz and is an ideal piece of Test Equipment. |
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Square Wave Oscillator - This project is a piece of test equipment. It's a
square wave oscillator with 6 selectable frequencies from 1Hz to 100kHz, incrementing
in decade values. It's most useful application is as a Signal Injector for
radios and TV's. A square wave is the most suitable for testing the IF (Intermediate
Frequency) strip as the signal will pass through the IF transformers without any
attenuation, no matter what....(projected added 05/08) |
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Square Wave Oscillator (Andy Collinson) - A very basic square wave generator
using a CMOS 4011 NAND gate..... |
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Square Wave Oscillator (Seiichi Inoue) - (schematic added 03/04/05)
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Square Wave Oscillator 555 - (circuit / schematic added 6/05) |
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Square wave oscillator with fixed frequency steps using 555 timer chip -
(diagram added 05/07) |
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Square Wave to Sine Converter - (electronic schematic / circuit added 4/02)
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Squarewave Generator - Three switchable frequencies: 100Hz, 1KHz, 10KHz 1.5V
battery operated, minimum parts counting (added 3/05) |
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Square-wave modulator has variable frequency and pulse width - 8-Aug-02
Issue of EDN A few years ago, I worked at a disk-drive company. We had a plating
facility that required square waves to drive the high-voltage plating operation. The
challenge was that the square wave's pulse width had to be variable, along with the
duty cycle. Also, the amplitude of the pulses had to be adjustable.... [Design Idea by
Michael Fisch, Agere Systems, Longmont, CO] |
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Summer Linearizes Ramp & Triangle Generators - 12/08/94 EDN-Design
Ideas....The ramp generator in Fig 1a and the triangle-wave generator in Fig 1b charge
capacitor C1 linearly. The key to the circuits' linearity is an op-amp adder that sums
a reference voltage with the voltage on C1. For Fig 1a's ramp generator, the adder
comprises op-amp IC1, R4, R5, and associated components.... EDN is migrating links.
This link is not verified. Search the "title" + "EDN" for new link. |
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SwOpAmp Makes Square-wave Generator - 02/15/96 EDN-Design Ideas....A simple
technique provides phase compensation for the oscillator in Figure 1a. In this
circuit, a tungsten lamp regulates the amplitude of a crystal bridge oscillator.
This type of oscillator produces a very low-distortion output at a very stable
frequency. The op amp must have a.... EDN is migrating links. This link is not
verified. Search the "title" + "EDN" for new link. |
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