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. . . Circuit by David A. Johnson P.E.-June, 2000
Very Low Voltage Oscillator Circuit - OK, you may not ever need an oscillator to function using a power supply voltage below one volt, but if you ever do need one, here is one way to do it. Getting any electronic circuit to operate below one volt is a real challenge. Typical silicon bipolar . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2008
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 __ Designed by Leon Heller
Video Generators - many test picture generation circuits __ Designed by Mijo Kovacevic, S51KQ
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 __ Designed by Seiichi Inoue
Voltage Controls Sine-Wave Frequency - 08/17/95 EDN Design Ideas: The circuit in Fig 1 generates a 50-Hz to 1-kHz sinusoidal waveform that exhibits lower than 60-dB THD. The input voltage controls the output frequency with the relationship 1 kHz/V. The output amplitude is invariant with frequency over the entire operating range. IC 1 is a V/F converter Design by Yongping Xia, EBT Inc, Torrance, CA
Waveform Generator Minimizes Amplitude Dependency - EDN Design Ideas: May 26, 2011 improve a waveform generator's immunity to changes in power-supply voltage. Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia
Waveform Generator provides Flexible Frequency tuning for Sensor Measurement - 12/17/04 EDN Design Ideas: Variable-resistance sensors convert a fixed dc excitation voltage or current into a current or voltage that's a straightforward function of the quantity undergoing measurement. in another class of sensors, moving objects or fluids p Design by Colm Slattery Analog Devices, Limerick, Ireland
Weighting Filter for Audio Measurements - For noise measurements. ideal for use with the AC Millivoltmeter above __ Designed by Rod Elliott ESP
What I had to do to stabilize a VFO… - From the basic homebrew literature (QRP Classics, DeMaw's notebooks, various ARRL Handbook projects, etc) , I could never get VFO stability that really satisfied me. __ Designed by John Seboldt, K0JD
Wide Swing Variable Crystal Oscillator - amateur radio construction projects. __ Designed by Peter Parker
Wide-range voltage regulator automatically selects operating-mode - 06/09/05 EDN Design Ideas: Regulator seamlessly adapts to wide output range Design by Joel Setton, Crolles, France
Wien Bridge Oscillator keeps THD BeLow One PPM - 11/10/94 EDN Design Ideas: 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 Design by Jeff Smith, Analog Devices, Wilmington, MA
Wien Bridge Oscillator Rail-to-Rail Sine Wave Generator - Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc
Wien Bridge Oscillator with SPICE simulation - Timing and oscillator circuit diagrams / circuit schematics__
Wien-Bridge oscillator has simplified frequency control - in this article, a modified version of the classical circuit that uses a single low-cost variable resistor for frequency control will be described. __ Designed by Ramon Vargas 20-8-04
Wien-bridge oscillator is reborn - 06/13/02 EDN Design Ideas: 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 cons Design by Michael Fisch, Agere Systems, Longmont, CO
Wien-bridge Theremin - This circuit is a basic theremin with only a pitch control. it uses the "heterodyne" technique, as did Theremin's original instrument. Heterodyning is advantageous in its simplicity, and is made further attractive in this design by eliminating the coils that are usually hard to find (electronic design 10/05) __ Designed by Arthur Harrison
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 __
XTAL-Controlled FM TX (V6) - My FM Wireless microphone V5 has been very popular, both as a beginners project and as a kit. it is interesting that it has also been the biggest cause of lots of e-mail, the most common question being How can I make it crystal controlled?. The oscillator can be made crystal controlled; replace the 2p7 with a 5th harmonic crystal. The oscillator will then be very stable, so stable in fact, that it cannot even be modulated! This means that you could only use it to send CW (morse code) __ Designed by Harry Lythall-SM0VPO
Yield 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, Design by Daniel Dufresne, Decatron, St Bruno, PQ, Canada
Zener test serves as DC source - 11/25/04 EDN Design Ideas: This design idea describes a versatile test circuit for zener diodes after yet another misread zener diode had infiltrated the ranks of 1N4148 diodes assembled on a pc board. As a bonus, the circuit can serve as a moderate-voltage, Design by John Jardine, JJ Designs, West Yorkshire, UK |