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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 __ 

SCR Flipflop for Alternating Flashing Light Bulbs -  Schematic only __ Designed by G.L. Chemelec

Self-Heated Transistor Digitizes Airflow -  13-Mar--96 EDN-Design Ideas - A sensitive and reliable way to measure airflow is to exploit the predictable relationship between airspeed and the heat dissipated by a sensor exposed to the flow while being held at a constant temperature differential above ambient.  The power required to maintain the elevated sensor temperature is proportional to the square root of the airspeed (King's law).  The popular hot-wire anemometer uses this principle, but suffers from the disadvantage of using a relatively fragile airflow sensor, a thin metallic filament __ Circuit Design by Stephen Woodward, University of North Carolina, Chapel Hill, NC

Series Regulator with Q900 -  This is a series regulator with Q900 being the control element, Q901 a driver, and Q902 an error amp.  ZD900 forms the emitter reference voltage source.  Since the generated high voltage and other voltages are linked by means of the magnetic field of T900, any change in H.  V.  will be reflected back to all of the other voltages.   __ Designed by Chris Candreva

Shortwave Audion -  It is a Hartley-ECO Audion, in which the plate is grounded for RF.  Positive feedback from cathode to grid occurs via the coil tap.  The amount of feedback is determined by the 100k pot; this controls the voltage at the screen grid and thereby the transconductance of the valve (higher voltage resulting in greater transconductance).  __ 

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 __ Circuit Design by Simon Bramble, Maxim Integrated Products, UK

Signal Frequency Beat Frequency Oscillator -  Timing and oscillator circuit diagrams / circuit schematics __ Designed by Peter Parker VK3YE

Signal Processor DSP for Radio Communications -  The W9GR DSP-3 is an improved low cost digital signal processor for radio communications use.   It features 18 DSP functions, a LED display, and 13 bit audio precision__ Quantics

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 __ Circuit Design by Israel Schleicher, Green Spin, Bakersfield, CA

Simple Circuit Frequency Reader for conversion VFOs -  If you are interested in improving the mechanical frequency reading of your home made transceiver, or if you want to equip your old RIG with a digital reader, this may be the project for you.  It is simple enough to assure a good and sure result also to beginners, and it doesn't require any microprocessor programming, in fact the only components employed are simple and conventional CMOS ICs.   __ Designed by Francesco Morgantini IK3OIL

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 __ Circuit Design by Med Dyer, Jabra Corp, San Diego, CA

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 __ Circuit 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 noise 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

Simple Circuit VCOM adjustment uses any logic-supply voltage -  09/30/04 EDN-Design Ideas - All TFT [thin-film-transistor] LCD panels require at least one appropriately tuned VCOM signal to provide a reference point for the panel’s backplane.  The exact value of VCOM  varies Page includes several designs.  Scroll to find this one __ Circuit Design by Peter Khairolomour and Alan Li, Analog Devices, San Jose, CA

Simplest 555 Oscillator -  The simplest 555 oscillator takes output pin 3 to capacitor C1 via resistor R1.  When the circuit is turned on, C1 is uncharged and output pin 3 is HIGH.  C1 charges via R1 and when Pin 6 detects 2/3 rail voltage, output pin 3 goes LOW.  R1 now discharges capacitor__ 555-Timer

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 IC1A zero-crossing detector.  The integrator block, IC1B, then integrates the square wave to produce a triangular wave.  The triangular wave passes through two narrow bandpass filters comprising IC2A and IC2B.   __ Circuit 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 __ Circuit Design by Carlos Bernal

Sine Wave Generator -  I introduce the sine wave oscillator which used the operational amplifier in this page.  The Wien bridge sine wave oscillator to introduce is the oscillator which works in the oscillation by returning (positive feedback) the oscillation output to the input.  Because there are few parts, the Wien bridge oscillator is the often used circuit.  The point of this circuit is the negative feedback circuit to make the oscillation operation be stable.   __ Designed by Seiichi Inoue

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/Cosine Wave Oscillator -  I introduce the oscillator which outputs the Sine wave and the Cosine wave at the same time using the operational amplifier.  Because the distortion was big at the circuit to have been introducing before, I improved at the circuit with little distortion.  The circuit this time combines the integration circuit and the inverter by the operational amplifier.   __ Designed by Seiichi Inoue

Sinewave Generation Techniques -  I recently discovered an interesting App 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__ 

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.    __ Circuit Design by JM Terrade, Clermont-Ferrand, France

Sinewave generator with AD9835 DDS, driven by BASIC-52 -  You may want to check out the regenerator 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 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 __ Circuit Design by Louis Vlemincq, Belgacom, Evere, Belgium

Single IC Forms Precision Triangular-Wave Generator -  04/08/10 EDN-Design Ideas - Generate a triangular wave for testing other circuits.   __ Circuit Design by Akshay Bhat, Maxim Integrated Products Inc, Sunnyvale, CA

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 __ Circuit Design by Abhirup Lahiri, Netaji Subhas Institute of Technology, New Delhi, India

Specifying Quartz Crystals -  App Note/ 726 / Dec-08__ Maxim Integrated

Spice Model Emulates VCO -  07/06/95 EDN-Design Ideas - A behavioral model treats a circuit as a black box, which you can describe using an equation or table.  Listing 1 is a Microsemi PSpice behavioral model that simulates the operation of a voltage-controlled oscillator (VCO].  The output signal of a VCO is VO=Aβ sin (2ãfOt], where A is the amplitude, t is the time variable __ Circuit Design by Dr. Bashir Al-Hashimi, Staffordshire University, Stafford, UK

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 __ Circuit Design by Michael Fisch, Agere Systems, Longmont, CO

Stable Pulse Generator Uses Matched Transistors In a Current Mirror -  02/02/12  EDN-Design Ideas - Inexpensive dual transistors work as well as do legacy matched pairs.   Using CMOS gates to generate pulses sometimes causes timing uncertainty due to gate-threshold variations.  For accurate pulse widths, you can use BJTs (bipolar-junction transistors).  Basing the design on current comparison allows the circuits to operate at low voltages.  Proper clamping of the timing capacitor avoids pulse shortening with increased repetition frequency.  These circuits work with somewhat less accuracy at supply voltages lower than 5V. __ Circuit Design by Bill Morong, Paoli, PA

Stable, 18 MHz oscillator features automatic level control, clean sine wave output -  06/23/05  EDN-Design Ideas - Analog oscillator has stable RF output __ Circuit Design by Jim McLucas, Longmont, CO

Stepper Motor controller -  On these pages, I will introduce a control circuit for stepper motor.  The software of this project is adapted to Embedded Systems (Lab13) for 2002 of Cleveland State University.  PIC16F84A __ Designed by Seiichi Inoue

Super Low Distortion Variable Sine Wave Oscillator -  The LT1028 (gain of –1 stable) /LT1128 (gain of +1 stable) achieve a new standard of excellence in noise performance with 0.85nV/rtHz 1kHz noise, 1.0nV/rtHz 10Hz noise.  This ultralow noise is combined with excellent high speed specifications (gain-bandwidth product is 75MHz for LT1028, 20MHz for LT1128) , distortion-free __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Supporter for my fiber glass antenna mast -  This is my Homebrewed fiber glass antenna mast supporter used for a 10 meter tall fiber glass antenna mast (made in May 2005)  __ Designed by Bjarke Korsgaard

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 __ Circuit Design by Jim Todsen, Burr-Brown Corp Tucson, AZ

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Oscillators:  #'s - D      E - R      S - Z


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