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Signal Generator Circuits

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

Last Updated: December 31, 2017 10:34 AM

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

Radio Frequency (RF) Oscillators -  Every oscillator has at least one active device (smarties don't complicate matters for me - just read on) be it a transistor or even the old valve.  This active device and, for this tutorial we'll stick to the humble transistor, acts as an amplifier.  There is nothing flash about that.  For this first part of the discussion we will confine ourselves to LC Oscillators and i'll keep the maths to an absolute minimum.__ Ian Purdie

Radio/Audio Frequency Generator Cum BFO -  This radio-cum-audio frequency signal generator can also be used as a beat frequency oscillator (BFO) for continuous-wave and single-sideband signals.  Fig.1 shows the circuit of the audio frequency oscillator built around...__ Electronics Projects for You

Ramp Controlled Light -  The circuit described here can be used for controlling a decorative lamp from zero intensity to maximum intensity in a specified time.  Typical applications are for controlling Christmas lamps and serial...__ Electronics Projects for You

Ramping & Displaying on 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

Resonant Frequency of a Colpitts Oscillator -  Using a circuit from the RF schematics section, and the formula from the theory section, you can calculate the resonant frequency for the Colpitts oscillator __ Designed by Andy Collison

Resonator BFO -  This circuit was used to stop all the BFO drift.  The circuit is extremely stable.  Turn the receiver off, and then on at any time and temperature, the BFO frequency is exactly the same.   __ Designed by Web David White, WN5Y

RF & Waveform Generator -  Generates RF-Frequencys 0.8-2.5 GHz (resolution 100Hz) , 22MHz-512MHz (resolution 125kHz-1MHz depending on frequency) and Waveforms 0-100kHz (resolution 1Hz).  Waveforms are Sine, Square, Triangle, Pulse, Sawtooth (positive and negative).  All modes work independently and can be used at the same time.  Very convenient user interface with LCD Display and up/down/cursor functionality.  But please don't expect an easy to copy, 10 Minute instant design.  The waveform part is a nice project for everyone, but the RF part is only for very experience hobbyists.   __ Designed by Herbert Dingfelder

RF oscillator uses current-feedback op Amp -  10/03/02 EDN Design Ideas:  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 output current, converts it to voltage across a large impedance, and amplifies it to the output using a high-power, low-output-impedance amplifier __ Circuit Design by Victor Koren, Tioga Technologies Ltd, Tel Aviv, Israel

RF Signal Generator -  amateur radio construction projects.   __ Designed by Peter Parker

RF signal generator -  TR1 is a high gain FET (Field Effect Transistor) and is configured as a Colpitts style oscillator.  The oscillation frequency is set by the variable capacitor (C1+C2) and the five pairs of switched inductors.  There is significant overlap between the ranges, due to the limited range of readily available inductors.  However even by using specially would inductors, four frequency bands would have been needed to cover the range. __ Designed by Paul Stenning

RF signal meter with LEDs -  The simple but effective circuit presented here converts an RF input signal into a visible LED indication.  Only discrete components are used.  The circuit can be used as field strength analyser or RF Wattmeter when a 50 ohms resistor is connected between ground and HF (J1).  Calibration required.  Of course you can add extra LED stages in case you want to extend the range.  The second picture shows how the circuit can be build on a very small piece of vero-board.   __ Designed by Ron Zoetermeer, JO22gb, Netherlands

Sample Derivative of a Waveform -  09/14/00 EDN Design Ideas:  Basic derivative (differentiating) circuits use a lowpass filter or an active operational-amplifier implementation.  These circuits need a large-value capacitor when differentiating a slowly varying signal.  Moreover, the circuits  __ Circuit Design by Joaquin Garcia

Sawtooth Generator Operates At High Frequency -  03/15/12  EDN Design Ideas:  Use a digital logic gate to generate an analog waveform. __ Circuit Design by Luca Bruno, IIS Hensemberger Monza, Lissone, Italy

Sawtooth Generator Spans a 70-Db Rang -  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 __ Circuit Design by Paul Hendricks, Analog Devices, Wilmington, MA

Sawtooth Wave Oscillator -  in this page, I introduce the sawtooth wave oscillator which used the operational amplifier (TL082).  The composition of this circuit is the same as the triangular wave oscillator basically and is using two operational amplifiers.  At the circuit diagram above, IC (1/2) is the Schmitt circuit and IC (2/2) is the integration circuit.  The difference with the triangular wave oscillator is to be changing the time of the charging and the discharging of the capacitor __ Designed by Seiichi Inoue

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,  __ Circuit Design by Daniel Dufresne, Decatron, St Bruno, PQ, Canada

Schmitt Trigger Provides Toggle Function -  EDN-Design ideas -- 03/17/11    Make a digital signal toggle without a flip-flop.  D-type flip-flops, with the inverted output connected to the D input, can toggle a clock signal.  if your circuit has an extra Schmitt-trigger inverter gate, you can use it to accomplish the same thing.  Every time you press and release the momentary pushbutton switch in Figure 1, the circuit reverses to the opposite of what it was before you pressed it. __ Circuit Design by Vladimir Oleynik, Moscow, Russia

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

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

Servicing & Repairing Pagers using the Agilent 8648A Option 1EP -  Application Note__ Aligent

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.   __ Designed by Ashish Parab

SFG-1013 Signal generator TTL Output Modification -  how to make it work __ Designed by Thomas Scherrer OZ2CPU

Shelf-Life Evaluation of Lead-Free Component Finishes -  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, 24-May-04

Shift registers & resistors Deliver multiphase sine waves -  04/13/06 EDN Design Ideas:  This simple method uses only digital logic and fixed-value resistors __ Circuit Design by Gary Steinbaugh

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

Signal Processor Adds LED Display -  6-Jun-96 EDN Design Ideas:  Designers using the Texas instruments TSS400, a versatile 4-bit sensor-signal processor, may find the circuit in Figure 1 useful as a replacement for, or an adjunct to, the IC 's built-in display capabilities __ Circuit Design by N Thomas Christman, Zablocki VA Hospital, Milwaukee, WI

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

Simple Circuit IF Signal Generator -  Here is a versatile circuit of iF signal generator which may be of interest to radio hobbyists and professionals alike. Transistors T1 and T2 form an astable multivibrator oscillating in the audio frequency range of 1 to 2 kHz.  RF oscillator is built around transistor T3.  Here again a 455kHz ceramic filter/resonator is employed for obtaining stable iF.  __ 

Simple Circuit RF signal meter with LEDs -  The simple but effective circuit presented here converts an RF input signal into a visible LED indication.  Only discrete components are used.  The circuit can be used as field strength analyser or RF Wattmeter when a 50 ohms resistor is connected between ground and HF (J1).  Calibration required.  Of course you can add extra LED stages in case you want to extend the range.  The second picture shows how the circuit can be build on a very small piece of vero-board.   __ Designed by Ron Zoetermeer, JO22gb, Netherlands

Simple Circuit Sawtooth Generator Operates At High Frequency -  03/15/12  EDN Design Ideas:  Use a digital logic gate to generate an analog waveform. __ Circuit 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 __ 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 Transistor Organ -  This simple circuit can provide hours of enjoyment as you learn tunes, play duets or just make some really weird sounds by pushing all the buttons at once.  You have probably seen this circuit before, it is fairly common.  I have seen it in several __ Designed by Aaron Cake

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

Simple Nanosecond-Width Pulse Generator Provides High Performance -  11/11/04  EDN Design Ideas:  if you need to produce extremely fast pulses in response to an input and trigger, such as for sampling applications, the predictably programmable short-time-interval generator has broad uses.  The circuit of Figure 1, built around a quad high-speed compara __ Circuit Design by Jim Williams, Linear Technology Corp

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


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