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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 by Daniel Dufresne, Decatron, St Bruno, PQ, Canada
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 __ Designed by Rod Elliott ESP
Set Reset Flip flop - This is an example of a set/reset flip flop
using discrete components. When power is applied, only one
of the transistors will conduct causing the other to remain off.
The conducting transistor can be turned off by grounding it's
base through the push button which causes the collector voltage
to rise and turn on the opposite transistor. __ Bill
Bowden
SFG-1013 Signal generator TTL Output Modification - how to make it work __ Designed by Thomas Scherrer OZ2CPU
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, IC 3, which uses a 100-kHz square-wave clock signal that microcontroller IC 2 generates. (Any other convenient square-wave source is also acceptable Design by Simon Bramble, Maxim Integrated Products, UK
Simple AF-oscillator / Signal generator - Ham Radio - Other __ Designed by Guy Roels ON6MU
Simple Circuit 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. __
Simple Circuit Audio 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 __ Designed by Rod Elliott ESP
Simple Circuit Compensation Extends Oscillator's Range - 12/05/96 EDN Design Ideas: A simple technique provide as 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 negligible phase shift at the operating frequency, which Design by Israel Schleicher, Green Spin, Bakersfield, CA
Simple Circuit Detects Current Pulse - 01/06/94 EDN Design Ideas: The pulse detector provide as a visible indication of positive and negative current pulses. The pulses amplitudes can vary from20 to150 mA. The pulses durations can range from10 to40 msec, and their repetition rate can span40 to180 pulses/minute Design by Richard McGillivray, Grey Bruce Regional Health Centre, Owen Sound, Ontario, Canada
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 by Med Dyer, Jabra Corp, San Diego, CA
Simple Circuit Sawtooth Generator Operates At High Frequency - 03/15/12 EDN Design Ideas: Use a digital logic gate to generate an analog waveform. Design by Luca Bruno, IIS Hensemberger Monza, Lissone, Italy - March 15, 2012
Simple Circuit sine synthesizer generates 19-kHz pilot tone for FM baseband signal - 04/14/05 EDN Design Ideas: Low distortion, single-frequency sine source for stereo FM Design by Carlos Bernal and Diego Puyal, Departamento Ingeniería Electrónica y Comunicaciones, Universidad de Zaragoza, Zaragoza, Spain
Simple Circuit Sine Wave Oscillator including a PCB layout - Here is a simple Sine Wave Oscillator Circuit. __ Designed by G.L. Chemelec
Simple Circuit Squarewave Generator - Three switchable frequencies: 100Hz, 1KHz, 10KHz 1.5V battery operated, minimum parts counting __ Contact Flavio Dellepiane, fladello @ tin.it
Simple Circuit VCO, 300 to 500 Mhz - The datasheet says this VCO covers 300 to 500 Mhz, in this test setup with one coil it covers 350 to 475 Mhz with the controlling voltage. The output should be about -10dBm, but it's -20dBm. The stability and sideband noice was not good enough for my HAM radio project, sorry. But i'm sure it will be perfect to be used with a PLL. __ Designed by Thomas Scherrer OZ2CPU
Sine reference is synchronous with AC line - 02/15/00 EDN Design Ideas: Many applications require a sinusoidal reference voltage synchronized to the ac line voltage. You cannot derive such a reference voltage directly from the ac line because the waveform of the ac line is distorted because of nonlinear loads connected to the line and because the amplitude of the line signal varies. Hence, you cannot use a simple step-down transformer to derive the reference signal. The circuit in Figure 1 develops a line-synchronized reference signal whose phase and amplitude you can adjust using potentiometers P1, P2, and P3. The circuit steps down and converts the line voltage to a square wave using the IC 1A zero-crossing detector. The integrator block, IC 1B, then integrates the square wave to produce a triangular wave. The triangular wave passes through two narrow bandpass filters comprising IC 2A and IC 2B. Design by P Seshanna
Sine Synthesizer Generates 19-Khz Pilot Tone for FM Baseband Signal - 04/14/05 EDN Design Ideas: Low distortion, single-frequency sine source for stereo FM Design by Carlos Bernal
Sine Wave Generator - A classic Wien Bridge oscillator using an Op-Amp covering a frequency range of 15 to 150kHz in four switched steps. __ Designed by Andy Collison
Sine Wave Oscillator - Here is a simple Sine Wave Oscillator Circuit. __ Designed by G.L. Chemelec
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 by JM Terrade, Clermont-Ferrand, France
Sinewave generator with AD9835 DDS, driven by BASIC-52 - You may want to check out the RF generator project for more modern version of the chip, and using it with AVR microcontroller __ Designed by © Madis Kaal
Sine-wave step-up converter uses Class E concept - 02/17/05 EDN Design Ideas: 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 by Louis Vlemincq, Belgacom, Evere, Belgium
Single-Supply Differential-Pair L-C Oscillator - This oscillator uses a differential transistor pair, Q1 and Q2, to control the current in a parallel-resonant tank consisting of L1, C4, and C5. Upon power application, Q1 supplies current to the tank, causing it to ring at resonance. Part of the ringing voltage is coupled to Q2's base via C3. Q2 conducts, turning Q1 off. The voltage at Q1's collector continues to change as a result of resonance, turning Q2 off, and again allowing Q1 to conduct __ Designed by Arthur Harrison
Single-Supply Wien Bridge Oscillator - Operational amplifier U1A, in conjunction with the parallel and series RC legs, form a frequency determining network, while U1B, Field Effect Transistor (FET) Q1, and associated components form an amplitude regulating circuit that prevents the output waveform from saturating. The 0.1microfarad capacitor and 100K ohm resistor in U1B's feedback path are selected for an appropriate amplitude regulation time constant, based on the oscillator's frequency. As shown, the circuit will work well for values of C=100pF and R=20Kohm, producing an output frequency of about 80KHz __ Designed by Arthur Harrison
Sinusoid generator uses dual-output current controlled conveyors - 22-Jan-09 EDN Design Ideas: You can design sine-wave oscillators without resistors, which improves on power consumption Design by Abhirup Lahiri, Netaji Subhas Institute of Technology, New Delhi, India
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 __ Designed by G. Forrest Cook
Spot-frequency Sine Wave Generator - 300Hz, 1KHz, 3KHz "output stable" test equipment tool.9V battery powered portable unit __ Contact Flavio Dellepiane, fladello @ tin.it
Square Wave Oscillator - it has adjustable (and settable) frequencies from 1Hz to 100kHz and is an ideal piece of Test Equipment. __ 555-Timer
Square Wave Oscillator - in this page, I introduce the square wave oscillator which used the Schmitt inverter circuit which was made with the CMOS
. The Schmitt inverter circuit has the hysteresis characteristic. The circuit to introduce is the oscillation circuit which used this characteristic. By the hysteresis characteristic, the voltage which becomes the H level with the input voltage of the inverter rising from 0 V (Voltage that the output becomes 0 V) and the voltage which becomes the L level, descending from +5 V (Voltage that the output becomes +5 V) are different. __ Designed by Seiichi Inoue
Square Wave Oscillator - A very basic square wave generator using a CMOS
4011 NAND gate __ Designed by Andy Collison
Square wave oscillator (2) - I introduce the square wave oscillation circuit which used the CMOS
inverters in this page. This circuit is the circuit which is often used by the following reason. __ Designed by Seiichi Inoue
Square wave oscillator using 555 timer chip - 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 __ Designed by Collin Mitchell
Square Wave to Triangle Wave Converter - This circuit converts a square waveform to a triangle waveform while automatically maintaining a constant triangle amplitude for a wide range of input frequencies. Although originally designed for application in a communications system, the idea is readily adaptable for certain electronic music applications where waveform conversion is desired. Operation is as follows:Transistor Q2 provides a square wave at its collector that has an amplitude controlled by Q1
. __ Designed by Arthur Harrison
Squarewave Generator - Three switchable frequencies: 100Hz, 1KHz, 10KHz 1.5V battery operated, minimum parts counting __ Contact Flavio Dellepiane, fladello @ tin.it
Square-wave Modulator has variable frequency & pulse width - 08/08/02 EDN Design Ideas: 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 by Michael Fisch, Agere Systems, Longmont, CO
Summer Linearizes Ramp & Triangle Generator - 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 IC 1, R4, R5, and associated components Design by Valery G Chkalov, Scientific Association "Typhoon," Obnisk, Russia
SwOpAmp Makes Square-wave Generator - 02/15/96 EDN Design Ideas: A simple technique provide as 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 by Jim Todsen, Burr-Brown Corp Tucson, AZ
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