1 Hz Pulse Frequency Generator -  Here is a 1Hz pulse/frequency generator using the popular timer IC 555 which is wired as an Astable Multivibrator.  The output pulses can be indicated visually by the LED.  An Astable Multivibrator, often called a free-running Multivibrator, is a rectangular-wave generating circuit.  Unlike the Monostable Multivibrator, this __ Designed by D Mohankumar

µC makes inexpensive sine-wave generator -  12/17/98 EDN Design Ideas:  You can use A/D converters or external, controllable oscillators to generate sine waves from low-power, low-cost µCs.  However, these methods add cost, reduce reliability, increase circuit and software complexity, increase power consumption, and increase overall size.  Alternatively   Page includes several designs.  Scroll to find this one Design by Jorge Luis B Romeu, IdeaWorks LTD, Syracuse, NY

10 Second Ultra Lower Power Oscillator -  This circuit works much like the classic 555 timer, but draws only about 1.5 microamps from a 3 volt battery.  it is highly stable under varying temperature and supply voltages. . . Circuit by David Johnson P.E.-May, 2000

125Khz Oscillator from CMOS Inverters -  This circuit inverts the LC components so the inductor is grounded.  Two inverters are needed to produce the needed oscillation.  Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies. . . Circuit by David A. Johnson P.E.-March, 2002

125khz Oscillator with Medium Power -  This circuit adds even more inverters in parallel to deliver yet more power.  The values shown are for 125KHz . . . Hobby Circuit designed by David Johnson P.E.-March, 2002

125Khz Ultra Pure Sine Wave Signal Source -  For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed.  The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0.01% . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

1Hz up to 22MHz Generator -  This is simple MAX038 generator.  it produces sine, triangle and square waves from 1Hz up to 22MHz.  The Amplitude, offset and duty cycle are adjustable to offer wide range of generated signals.  Frequency adjustment is made as a rotary switch S8 with a capacitor bank and variable resistor P7.  Amplitude, offset and duty-cycle are performed via variable resistors.  Switch S5 selects generated waveform.  The outpud at U1-19 is 2V p-p for all waveforms.  For amplitude adjustment, P6 and R38 form a voltage divider.  The summing amplifier multiplies that voltage, so the signal at the output will vary up tp 24.4V p-p.  The offset voltage is controlled by resistor P5.  Duty-cycle adjustment is controlled by resistror P4.  __ 

1kHz precision sine generator using PIC -  Using a 16F628 to generate an accurate 1kHz sine in software for calibration and test use __ Designed by Roman Black

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 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

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 ofAmplifiers (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.

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

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 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

556 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

68HC11 Synthesizes Accurate Sine Wave -  09/02/96 EDN Design Ideas:  You can use a 68HC11 and a 12-bit serial DAC (Figure 1) to generate accurate sine waves without using floating-point arithmetic.  Figure 2 shows a block diagram for this sine-wave generator.  You can easily analyze the generator's behavior by writing state equations in the z domain.  You can also write equations in the domain.  The location of the two poles Design by Mika Maaspuro, Espoo, Finland

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

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