• VERY LOW POWER GATED CRYSTAL OSCILLATOR
  The circuit gates the output of a continuously operating 32KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed. The technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and switching on a transistor power stage only as needed. The method keeps the standby power consumption to a very low 1uA when used with a 3v supply.

• VERY LOW POWER ASTABLE MULTIVIBRATOR
  This classic circuit draws only 200 nanoamps from a 1.5v supply.

• ULTRA PURE 125KHz 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%. 

The Wien bridge Oscillator is reborn:  06/13/02 EDN Design Ideas  /  (added 1/05)  In 1940, William Hewlett and David Packard launched a product from a garage. The product was a Wien-bridge oscillator. It consisted of a single-pole highpass filter in series with a single-pole lowpass filter. To keep the gain constant, the circuit used an incandescent pilot light to provide AGC (automatic gain control)....

Timers Generate Variable Sweep Frequencies:  08/01/96 EDN-Design Ideas  /  (Electronic circuit added 5/02)

Tiny Crystal Oscillator #2:  High-stability gate oscillator uses two, 5-pin SOT packageddevices (Electronic circuit added 7/03)

Transconductance amp gives Oscillator reciprocal response:  04/17/03 EDN Design Ideas  /  (added 1/05)  The circuit in Figure 1 is a variation on the familiar integrator/comparator triangle-wave oscillator, which you typically implement with two op amps. An integrator and a comparator connect in a positive-feedback loop; the comparator drives the integrator and vice versa. A fixed amount of hysteresis exists in the comparator, producing a triangle wave at the integrator's output....

Transistor Organ:  (circuit added 7/02)

Tri Waveform Generator:  (added9/04)

Triangle and Square Wave Generator:  (Electronic Schematic / circuit added 4/02)

Triangle and Squarewave Generator #2:  (Circuit / schematic design added 6/06)

Trimless IF VCO part 2:  Maxim Application Note 688, February 5, 2001 (Electronic circuit design added 02/05)

Trimless IF VCO: Part 1: Design Considerations:  This application note explores the design fundamentals needed to implement a trimless, fixed-frequency, IF voltage-controlled oscillator (VCO) and points out the challenges in guaranteeing proper circuit operation. VCOs are essential components in the architecture of most wireless systems. In dual-conversion approaches, a fixed-frequency IF VCO is required to control the frequency translation from IF to baseband and/or baseband to IF.   APP 711: Feb 05, 2001  (Electronic circuit design added 02/05)

Twin-T oscillator:  This circuit produces an extremely low distortion sine wave, in spite of the non-linear devices used for amplitude limiting (D1 and D2). The reason is first that distortion (harmonics) is fed to the minus input of the opamp with far less loss than to the plus input, severely attenuating them. Second, this oscillator rides a delicate balance between negative and positive feedback. This means that only a small amount of non-linearity is needed to stabilize the amplitude. To minimize distortion, R5 must be a high value. Although a bit more complex than the Wien bridge oscillator, the amplitude of this oscillator is much easier to vary.   Designed by Andrew R. Morris  (added 09/05)

Two Stage Chaotic Colpitts Oscillator for the UHF range:  (Electronic circuit design added 02/05)

Two Tone Audio Oscillator (use for SSB Tests):  (added 2/05)

Two Tone Train Horn:  (added 10/02)

Ultra Low Voltage Crystal Oscillator Circuit using Active Loads:  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (Circuit / schematic design added 6/06)

Ultra Low Voltage Micropower Crystal Oscillator Circuit:  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (Circuit / schematic design added 6/06)

Ultra Low Voltage Nanopower LC (Colpitts) Oscillator Circuit:  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (Circuit / schematic design added 6/06)

Use of the CMOS Unbuffered Inverter in Oscillator Circuit:  Texas Instrument Application ReportSZZA043 January 2004 (Electronic circuit design added 02/05)

Using the ESG-D RF Signal Generator's Multicarrier, Multichannel CDMA Personality for Component Test, Option UN5:  Aligent Application Note  (added 2/06)

Variable Gain Stage uses Voltage Output DAC:  10/27/94 EDN-Design Ideas / (added 03/05) The circuit in Fig 1 delivers a pure, buffered, and level-controlled sine wave. With no tuning requirements, the circuit works with all crystals up to about 30 MHz….  

VFO/Buffer:  It's basically a standard Hartley oscillator, followed by Roy Lewallen's buffer (page 14.20 of the 2001 Handbook). Output is +7 dBm into 50 Ohms. Don't be tempted to add a gate diode, this circuit doesn't need it, and it will degrade the phase noise performance, according to Ulrich Rohde. It should be suitable for any frequency up to 10 MHz or more (depending on how good you are at making drift-free oscillators) and may be tuned with a suitable capacitor or varicap tuning diode....  (Electronic circuit design added 02/05)

Video Generators:  many test picture generation circuits (Electronic circuit added 5/02)

Voltage Controlled Oscillator ( VCO ):  The oscillation frequency of the voltage controlled oscillator is controlled by the output of the PLL synthesizer and does the stable oscillation of 119.3 MHz.  (Electronic circuit design added 02/05)

Voltage Controls Sine Wave Frequency:  08/17/95 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)

Was that Really a Wildlife Tag?:  In wildlife management, very few tracking transmitters send some form of "station identification." Radio tags for birds and small mammals can't. These little devices must put out a signal to a ground range of a mile or so for up to a year or more, yet weight only a few grams, including battery. To do that, most of them consist of simple blocking or relaxation oscillators with only a few discrete components. You may hear the term "squegging oscillator" used to describe them. (Electronic circuit design added 02/05)

What I had to do to stabilize a VFO…:  (Electronic circuit design added 02/05)

Wide Swing Variable Crystal Oscillator:  (added 2/05)

Wien Bridge Oscillator (Rail-to-Rail) Sine Wave Generator :  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (Circuit / schematic design added 6/06)

Wien Bridge Oscillator is Reborn:  06/13/02 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) In1940, William Hewlett and David Packard launched a product from a garage. product was a Wien-bridge oscillator. It consisted of a single-pole highpass filter in series with a single-pole lowpass filter.

Wien Bridge Oscillator keeps THD BeLow One PPM:  11/10/94 EDN-Design Ideas  / (added 01/04)  The Wien-bridge sine-wave oscillator uses a light bulb to stabilize its amplitude. The circuit doesn't have a light bulb; it sports several enhancements that lower its distortion and generate a test signal pure enough for testing modern op amps and high-resolution A/D converters....

Wien Bridge Oscillator:  (circuit / schematic added 2/03)

WIFI CAN Antenna:  Got no dough for a commercial WiFi antenna? Looking for an inexpensive way to increase the range of your wireless network? A tin can waveguide antenna, or Cantenna, may be just the ticket. This design can be built for under $5 U.S. and reuses a food, juice, or other tin can.... (Circuit added 9/04)