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 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

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 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 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 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

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 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

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

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