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Waveform Generators

Waveform Generator Circuits:  #'s     A - B     C - E    
F - K     L - O     P - R     S     T    
U - Z

 

Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

Accurate One Shot Pulse Generator -  This timer circuit draws only 3ua of current, and can be powered by DC supplies ranging from 3v to 15v.  The circuit produces accurate pulses whose time can easily be adjusted, based on the R1 x C1 time constant.  The time should not change,. . . Circuit by David A. Johnson P.E.-September, 2010

Astable Multivibrator with Very Low Power -  This classic circuit draws only 200 nanoamps from a 1.5v supply . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Astable Ultra Low Power Multivibrator -  Taking advantage of some new voltage comparators, this circuit can produce a nice square wave signal while drawing only 1.6 micro amps.  With the inclusion of a diode, the circuit can also produce short pulses instead of a square wave signal . . . Hobby Circuit designed by David Johnson P.E.-December, 2004

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A Low distortion Audio Signal Generator -  Scroll down.  The next circuit (above) is a better implementation of the Wien circuit: this uses the Wien in the normal fashion, in the positive feedback path and with negative feedback to maintain stability.  The device marked Th1 is a glass bead type thermistor: some of these thermistors consist of a bead in an evacuated glass envelope and they are designed specifically for amplitude stabilization in such circuits.  if necessary the 100R can be altered to suit various thermistors (and to trim the amplitude).   __ Designed by Richard Torrens

A Low-Frequency Crystal Controlled Oscillator -  The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly.  This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the schematic of a circuit that will perform the task.  Unfortunately __ Designed by Ramon Vargas

A Practical Twin-T Oscillator -  Scroll down.  Perhaps the first thing that will strike you (if you have met the twin-T before) is that the input to the twin-T (from the bulb) is actually fed into the foot of the network and output is (as you might expect) from one arm (into the base of the transistor) but the other arm is earthed.  Now hold on a minute: an emitter follower has no voltage gain __ Designed by Richard Torrens

A Ramping & Displaying on an LM3914 -  Could be used for a Turn Signal indicator.  Also includes an additional Circuit and PCB for Driving Higher Power Lights.   __ Designed by G.L. Chemelec

A Waveform Generator Project -  if you need testing your audio projects or repairing audio amplifiers, surely you will need a waveform generator (WFG) to check if the signal you introduce in your equipment goes out without any distortion.  Also, if you are studying operational integrated circuits this project will be a handy tool to your experiments.   __ Designed by braincambre500 @ yahoo.com

Accurate 1hz Generator -  Accurate 1Hz squarewave pulses are required in stopwatches and other digital circuits.  Here is a low-cost, general-purpose 1Hz signal generator without using a crystal oscillator.230V, 50Hz, single-phase AC mains is stepped...__ Electronics Projects for You

Adjustable High/Low Frequency Sine wave generator -  This circuit uses the versatile MAX038 function generator.  Although in this circuit some of the advanced characteristics of this IC are disabled, you can generate Sine, Triangle, Square waves (adjusting A0 and A1 pins see datasheet on www.  maxim-ic.  com if you want other waves, use a switch __ Designed by Jonathan Filippi

AF Generator -  The sinewave generator is based on 4 op-amps which are present in a single TL084 i.c. (see fig.1).  Op-amps A1 and A2 are connected to the frequency determining RC networks R5+P1a/C1 and R6+P1b/C2, respectively.  in my version of the generator, P1 is replaced by a stepped attenuator (dual rotary switch with 12 positions, see above).  Moreover, I have included two additional frequency ranges; thus, S1 is in my version a dual rotary switch with 5 rather than 3 positions.   __ Designed by W.Mieslinger

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 __ Circuit Design by Moshe Gerstenhaber, Chau Tran, and Mark Murphy, Analog Devices Inc,Wilmington, MA

An Oscillator Sawtooth & Square Wave Output -  Simple, Single Supply and Works Very well with Minimum Parts Count.   __ Designed by G.L. Chemelec

Anton Chekhov -  My LO strategy involved mixing a 16.93 MHz xtal oscillator (xtal Q = ~100K) with a 3.121 to 3.216 MHz Hartley L-C VFO.  I planned to use the EMRFD Figure 4.24 method to extract low noise + distortion from the xtal oscillator and mix it with the VFO signal in a Gilbert cell mixer like the NE612. __ Contact Vasily Ivanenko

Arduino LFO Waveform Generator -  This project uses an Arduino microprocessor and a DAC0808 8 bit parallel DAC to produce arbitrary low frequency oscillator (LFO) waveforms.  These waveforms are useful for driving a tremolo/vibrato circuit in a guitar amplifier such as the Lil Tiger or a phaser effect such as the Liquidator __ Designed by G. Forrest Cook

Arduino LFO Waveform Generator V2 -  This project uses an Arduino microprocessor and a MAX522 8 bit serial DAC to produce arbitrary low frequency oscillator (LFO) waveforms.  These waveforms are useful for driving a tremolo/vibrato circuit in a guitar amplifier such as the Lil Tiger or the Hammonator 2RVT.  This is a second generation version of this project, see the first version for reference. __ Designed by G. Forrest Cook

Astable Multivibrator with Very Low Power -  This classic circuit draws only 200 nanoamps from a 1.5v supply . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Astable Ultra Low Power Multivibrator -  Taking advantage of some new voltage comparators, this circuit can produce a nice square wave signal while drawing only 1.6 micro amps.  With the inclusion of a diode, the circuit can also produce short pulses instead of a square wave signal . . . Hobby Circuit designed by David Johnson P.E.-December, 2004

Asynchronous Divides Frequency by 1.5 -  10/10/96 EDN Design Ideas:  in some designes, you need to provide a number of phase-related clocks to various components.  in most cases, you generate the needed clocks by dividing a master clock by a power of two (synchronous division).  However, sometimes, it is desireable to divide a frequency by an odd or even fractional divisor.  in these cases, no synchronous method exists without generating a higher frequency master clock.  Figure 1 shows the block diagram of an asynchronous clock divider that provide as division by a factor of 1.5. __ Circuit Design by Rolf Fielder, Ferrari Electronic GmbH, Teltow, Germany

Audio Sweep Oscilator -  This circuit was designed for a sound effect, but may serve other useful purposes when a basic, swept-frequency audio source is required.  it produces both square and triangular wave outputs that ascend from about 80 to 730 Hertz in a repeating cycle of about 12 seconds.  Appropriate component-value substitutions will yield variations in these parameters.  Operation is as follows:Operational amplifier U2B and its associated components form an astable multivibrator with __ Designed by Arthur Harrison

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 __ Designed by Rod Elliott  ESP

Auto pulse generator senses & responds to a probed load -  02/25/13  EDN Design Ideas:  Use this handy pulse generator to inject momentary power pulses into a circuit under test.   __ Circuit Design by Raju Baddi

Automatic Timeout included with this On/Off Flip/flop Circuit -  This circuit is ideal when a device needs to be turned on and off with a single pushbutton switch, but also needs to turn itself off after some period of time.  With the components shown, the output will stay on for only about 20 seconds . . . Hobby Circuit designed by David A. Johnson P.E.-May, 2012

Band-pass Network -  Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc

Basic RF Oscillator #1 -  This circuit switches a relay at dark via a Light Dependent Resistor or LDR for short.  The applications are numerous.  in my application, it switches on a light with an older type movement sensor and is mounted on the top corner of my workshop with the LDR facing upwards.  The Dark Activated Relay prevents that the light is triggered during daylight hours.  But, it can also be used to switch led-beacon lights for your driveway, or whatever __ Designed by Tony van Roon  VA3AVR

Battery-Powered LED Flashing Advertising #2 -  This circuit is similar to flashing LED advertising badge #1.    it uses a CD4013 dual D Flip/Flop IC .    The 74HCT74 IC in #81 does not always work.    As in #81, a single lithium battery will provide months of continuous LED flashing. . . . Hobby Circuit designed by David Johnson P.E.-March, 2002

Build a PIC Controlled DDS VFO 0 to 6 MHz -  This is NOT meant as a detailed building instruction for a DDS VFO.  it is only a few fragments from my experimental work in the shack.  This is "as is" information.  it may contain errors.   However, my own prototype works very well. __ Designed by Johan Bodin, SM6LKM

Build a Simple Circuit Complementary-Bracket-Pulse Generator -  20-Aug-09 EDN Design Ideas:  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 __ Circuit Design by Horst Koelzow, Global Thermoelectric, Calgary, AB, Canada

Build a UWB Pulse Generator On an FPGA -  06/23/11  EDN Design Ideas:  Make pulses that reach twice an FPGA's clock frequency.  You can implement a digital UWB (ultrawideband) pulse generator in most FPGAs.  The design lets you create a pulsed signal with a frequency that’s twice the FPGA’s clock frequency (Figure 1).  A previous design relies on asynchronous delays to make pulses of the desired frequency.  That design, however, requires an FPGA that supports tristate pullups, such as the Xilinx Virtex 2 (Reference 1).   __ Circuit Design by Punithavathi Duraiswamy, Xiao Li, Johan Bauwelinck, and Jan Vandewege, Ghent University, IMEC/Department of Information Technology, Ghent, Belgium

Bus-Request Signal Generates Logic Waveform -  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 __ Circuit Design by Dhananjay Gadre, IUCAA, Pune, India


Waveform Generator Circuits:  #'s     A - B     C - E     F - K     L - O     P - R     S     T     U - Z

 


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