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Signal Generator Circuits

Signal Generators:  #'s - B        C - L       M - S       T - Z

Last Updated: December 31, 2017 10:39 AM

Circuits Designed by Dave Johnson, P.E. :
Slotted Opto-Sensor used in Honeybee Counter -  I designed a circuit similar to this one a long time ago to help a beekeeper count the number of bees going into or out of a hive.  The low power circuit uses a slotted opto-sensor to detect the passing bees.  The circuit advances an electronic counting . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2000

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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.   __ 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 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 __ Circuit Design by Louis Vlemincq, Belgacom, Evere, Belgium

Single transistor pump -  This is a simple circuit that can produce a staircase voltage output given a periodic pulse input__ 

Slotted Opto-Sensor used in Honeybee Counter -  I designed a circuit similar to this one a long time ago to help a beekeeper count the number of bees going into or out of a hive.  The low power circuit uses a slotted opto-sensor to detect the passing bees.  The circuit advances an electronic counting . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2000

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

Soft limiter for oscillators uses emitter-degenerated differential pair -  10/12/06 EDN Design Ideas:  Phase-shift network plus a few active components yields low-distortion output - Most oscillator circuits include a nonlinear amplitude control that sustains oscillations at a desired amplitude with minimum output distortion.  One approach uses the output sinusoid's amplitude to control a circuit element's resistance, such as that of a JFET operating in its triode-characteristics region.  Another control method uses a limiter circuit that allows oscillations __ Circuit Design by Douglas Sudjian, Resonext Communications Inc, San Jose, CA

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__ 

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

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

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

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 __ Circuit Design by Valery G Chkalov, Scientific Association "Typhoon," Obnisk, Russia

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

Superposition: the Hidden DAC Linearity Error -  The Signal/Waveform Generator creates sine, square, triangle, and noise signals in a repeated or triggered fashion to help design, test, or troubleshoot an electrical device.  The system block diagram presented above includes on board signal synthesis and control via a DSP and microcontroller, respectively.  A General Purpose interface Bus (GPiB) and RS-232 port are typical communication options for signal generators but higher speed interface options are available through Local-Area Network (LAN) , Universal Serial Bus (USB) , and Peripheral Component interconnects (PCi)  __ Designed by Texas Instruments App Notes, 2-Oct-00

Sweep your Function Generator -  Function generators built around the XR2206 have always had an excellent price/performance ratio, and the IC although ‘obsolescent’ is still available.  if your generator does not have built-in sweep (‘wobbulator’) capability, a small external circuit is all you need.  must register on this site __ Designed by Published in Elecktor July/Aug, 2010

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

System implements digital clock Modulation -  10/28/04  EDN Design Ideas:  in spread-spectrum and direct-sequence receivers, it's often necessary to change the frequency of the clock oscillator, and thus the spreading-code clock, to lock the receiver's reference pseudorandom-noise code to the incoming cod __ Circuit Design by Dan Doberstein, DKD Instruments, Nipomo, CA

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Signal Generators:  #'s - B        C - L       M - S       T - Z

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