Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 45,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches



Signal Generator Circuits

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

Last Updated: December 31, 2017 10:32 AM

Circuits Designed by Dave Johnson, P.E. :
12v Touch Switch Exciter Circuit -  This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.    it can support a cable length of about 2500 feet.    A typical remote switch circuit is also shown as well as a receiver circuit for those switches.. . . Circuit by David Johnson P.E.-February, 2002

200Mhz-400Mhz Voltage Controlled Oscillator (VCO) -  if you need a clean emitter coupled logic (ECL) type signal between 200MHz and 400MHz this circuit works fine.  it uses four voltage-controlled capacitors to change the frequency. . . Circuit by David A. Johnson P.E.-March, 1999

3 Volt Low Battery Voltage Flasher -  This circuit is designed to monitor two alkaline cells (3v) that form the battery often used in portable electronic equipment. . . Circuit by David A. Johnson P.E.-January, 1998

3v 2hz Oscillator -  This is yet another method to generate low frequency output pulses.  The circuit uses an inexpensive under-voltage monitor IC and a couple of cheap MOSFETs.  it could easily be modified to produce pulse frequencies from about one cycle per minute to a maxim. . . Circuit by David A. Johnson P.E.-June, 2000

40Khz Burst Laser Diode Driver -  Some laser tag or simulated combat games can use this circuit to send short bursts of modulated laser light at the opponent's vest, equipped with a matching light receiver.  The circuit operates from three 1.5v cells (4.5v) that should provide enough energy . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

40Khz LED Test Signal Generator -  This 40KHz crystal controlled oscillator circuit drives an infrared LED with powerful 40ma pulses.  The circuit can be used to test optical communications circuits, designed to receive 40KHz modulated light signals. . . Circuit by David Johnson P.E.-February, 2002

40Khz Precision Triangle Generator -  This circuit generates a precision 40KHz triangle waveform . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

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:

2 DDS ICs implement Amplitude shift keying -  12/25/03 EDN Design Ideas:  Many communications systems, including RFID systems and cable modems, use AM (amplitude modulation].  This design idea shows how two DDS (direct-digital-synthesis] devices can implement AM and ASK (amplitude-shift keying] over a range of frequencies.  The AD9834 complete 50-MHz DDS IC (Figure 1) has a current output, so you can easily sum the outputs of two orof them by connecting them to a __ Circuit Design by Noel McNamara, Analog Devices, Limerick, Ireland

2 Stage Chaotic Colpitts Oscillator for the UHF range -  Chaos in the Colpitts oscillator was first reported at the kilohertz frequencies [1].  Later the circuit was investigated in the high frequency (HF: 3 to 30 MHz) range [2, 3].  Chaotic oscillations were demonstrated.  __ 

2 Tone Siren -  This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games.  With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of Police __ Contact Flavio Dellepiane, fladello @ tin.it

2 Tone Train Horn -  With this circuit you can electronically simulate the noise of a diesel-train horn.  The sound is triggered automatically as the train reaches a desired place on the track so you can produce the sound as the train approaches stations, level crossings, etc.  The circuit can be built simply by using one 556 or two 555 timers __ Designed by Tony van Roon  VA3AVR

200Mhz-400Mhz Voltage Controlled Oscillator (VCO) -  if you need a clean emitter coupled logic (ECL) type signal between 200MHz and 400MHz this circuit works fine.  it uses four voltage-controlled capacitors to change the frequency. . . Circuit by David A. Johnson P.E.-March, 1999

20MHz Function Generator 2 -  MAX038 0.1Hz, 20MHz.  __ 

20MHz Function Generator 3 -  Uses MAX038 IC to provide 0.1Hz, 15MHz sinusoidal, square and triangle frequency.  __ 

20MHz High Speed Function Generator -  The High Speed Function Generator was published in professional electronics section of Aug 1996 issue of Electronics Australia, and has proven to be extremely popular.  kit is no longer available from any of kit suppliers__ 

3 phase sinusoidal waveform generator uses PLD -  10/12/06  EDN Design Ideas:  Five ICs  substitute for electromechanical three-phase source __ Circuit Design by Eduardo Perez-Lobato, University of Antofagasta, Antofagasta, Chile

3 to 12 MHz Signal Generator -  amateur radio construction projects.   __ Designed by Peter Parker

3 Volt Low Battery Voltage Flasher -  This circuit is designed to monitor two alkaline cells (3v) that form the battery often used in portable electronic equipment. . . Circuit by David A. Johnson P.E.-January, 1998

300 to 500 Mhz VCO -  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

30Hz to 90Hz Adjustable Oscillator for Variable TAPE Drive-Using Model 700  -  No description, just schematic - OpAmps Lab inc is the manufactor of Amplifiers (Video / Audio / Distribution / Microphone / Equalization / Line / VCA / Power) , Switchers (Routing / Assign / Matrix) , Mult (Press) (Network-Feed) Boxes, Audio Transformers, Oscillators, Power-Supplies, Custom Sub-Systems.  __ Application OpAmps Lab Inc.

3-12 MHz Signal Generator -  Schematic Only __ Designed by Peter Parker VK3YE

32.768 kHz Oscillator using a Common Watch Crystal -  Below are a couple circuits you can use to produce a 32.768 KHz square wave from a common watch crystal.  The output can be fed to a 15 stage binary counter to obtain a 1 second square wave.  The circuit on the left using the 4069 inverter is recommended over the transistor circuit and produces a better waveform.  The single transistor circuit __ Designed by Bill Bowden

3-Phase Digital-Signal Generator Sweeps Frequency -  05/27/10 EDN Design Ideas:  Many power ICs  use frequency jitter, which spreads a control signal's spectrum, to control EMI (electromagnetic interference].  if you need to add frequency jitter to power ICs  that control three-phase signals, you can use an FPGA a __ Circuit Design by Yi-Chu Liao and Shao-Wei Leu, National Taiwan Ocean University, Keelung, Taiwan

3-phase sinusoidal-waveform generator uses PLD -  10/12/06  EDN Design Ideas:  Five ICs  substitute for electromechanical three-phase source __ Circuit Design by Eduardo Perez-Lobato, University of Antofagasta, Antofagasta, Chile

3v 2hz Oscillator -  This is yet another method to generate low frequency output pulses.  The circuit uses an inexpensive under-voltage monitor IC and a couple of cheap MOSFETs.  it could easily be modified to produce pulse frequencies from about one cycle per minute to a maxim. . . Circuit by David A. Johnson P.E.-June, 2000

4 Frequency Generator -  During development, testing and maintenance of digital and analogue electronic circuits and embedded systems, there is a need for TTL and CMOS signals produced by stable frequency sources.  These sources are...__ Electronics Projects for You

4 Transistor Tracking Transmitter -  Schematic and parts list only, no circuit description included.   __ Designed by Tony van Roon  VA3AVR

4 Transistor Transmitter -  This circuit provides an FM modulated signal with an output power of around 500mW.  The input Mic preamp is built around a couple of 2N3904 transistors, audio gain limited by the 5k preset.  The oscillator is a colpitts stage, frequency of oscillation governed by the tank circuit made from two 5pF capacitors and the inductor __ Designed by Paul K Sherby

40Khz Burst Laser Diode Driver -  Some laser tag or simulated combat games can use this circuit to send short bursts of modulated laser light at the opponent's vest, equipped with a matching light receiver.  The circuit operates from three 1.5v cells (4.5v) that should provide enough energy . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

40Khz LED Test Signal Generator -  This 40KHz crystal controlled oscillator circuit drives an infrared LED with powerful 40ma pulses.  The circuit can be used to test optical communications circuits, designed to receive 40KHz modulated light signals. . . Circuit by David Johnson P.E.-February, 2002

40Khz Precision Triangle Generator -  This circuit generates a precision 40KHz triangle waveform . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

4fsc Clock Generator MM1093 -  This IC generates a clock used for driving the CCD that comprises a comb filter required for Y/C separation, or for sampling A/D and D/A converters that comprise a digital comb filter.  it has a built-in subcarrier oscillator (3.58MHz or 4.43MHz) synchronized with the input chroma signal, and its monolithic clock oscillator.  MM1093ND and -NF are available for NTSC format, and MM1093PD and -PF for PAL format__ Mitsumi Electronics, Corp

5 Hints for Debugging MicroController-based Designs an 1458 -  Application Note__ Aligent

5 Tone Audio Oscillator -  Schematic only - amateur radio construction project __ Designed by Peter Parker VK3YE

555 stepper pulse generator -  The 555 Stepper Pulse Generator kit will help you with the pulse required to drive your favorite stepper Motor driver.  This kit uses the populer 555 timer IC for generating the Stepping Pulse.  it has two range low frequency and high frequency __ Designed by © 2008, Leiterplatten Zubehör und Reflow-Kit Beta LAYOUT

555 timer converted into pulse-width Modulator -  15-Feb-07 EDN Design Ideas:  Added CMOS switch enhances a PWM oscillator __ Circuit Design by Jordan Dimitrov, Tradeport Electronics, Vaughan, ON, Canada

555 Tone Generator 8 Ohm Speaker -  This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker.  in the circuit on the left, the speaker is isolated from the oscillator by the NPN medium power transistor which also provides more current than can be obtained directly from the 555 (limit = 200 mA).  A small capacitor is used at the transistor __ Designed by Bill Bowden

555 Triangle Waveform Generator -  The circuit is a triangle waveform generator that uses as few parts as possible.  A 555 timer IC , 2 resistors and two capacitors make the triangle wave.  The IC is connected in a 50% duty-cycle astable square-wave oscillator circuit.  The square-wave output is fed from pin 3 of the IC to an RC shaping circuit.  When the __ Designed by Popescu Marian

68HC11 Function Generator -  This site contains complete schematics and code for a 68HC11 based frequency counter, square wave synthesizer, sine wave synthesizer, programmable filter, capacitance and inductance meter, with a digitalker speech synthesizer output.  Project specifications are given below __ Designed by Michael Ellis

8 Hints for Better RF Signal Generator Measurements -  Application Note__ Aligent

8 Hints for Making Better Measurements using Analog RF Signal Generators -  Application Note__ Aligent

8038 Function Generator -  Built around a single 8038 waveform generator IC , this circuit produces sine, square or triangle waves from 20Hz to 200kHz in four switched ranges.  There are both high and low level outputs which may be adjusted with the level control.  This project makesa useful addition to any hobbyists workbench as well __ Designed by Andy Collison

8644A-2 AIR Navigation Receiver Testing with the Agilent 8644A -  Application Note__ Aligent

      <<<         >>>


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


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy


Copyright  January, 1998 - December, 2017     David A. Johnson & Associates.  All Rights reserved. 


 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.