|
|
|
Variable Gain Control Produces Pure Sine Wave - 10/27/94 EDN-Design
Ideas....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….. [Design Idea by Barry Harvey,
Elantec Corp, Milpitas, CA] |
|
VCO produces positive and negative output frequencies - 25-Dec-03
Issue of EDN The circuit in Figure 1 is a quadrature-output VCO that
provides both positive and negative output frequencies, depending on the
polarity of the control-voltage input. The circuit.... [Design Idea by Henry
Walmsley, Farnborough, UK] |
|
Very Low Power Astable Multivibrator - This classic circuit draws
only 200 nanoamps from a 1.5v supply …. [Designed by David A. Johnson] |
|
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 …. [Designed by
David A. Johnson] |
|
|
|
Very Stable 40kHz Generator ASCII format-A circuit that I have used before is
based on the CD4060 (14stage binary counter) and a 640Khz ceramic resonator. The
CD4060 is basically an oscillator and a ripple counter to divide the 640khz down to
something more usable. (electronic circuit added 7/03) |
|
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(added 02/05) |
|
Video Generators - many test picture generation circuits (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.....[App Note] |
|
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. IC1 is a V/F converter.... [Design Idea by Yongping Xia, EBT Inc, Torrance, CA] |
|
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,....(added 02/05) |
|
Waveform Generator provides Flexible Frequency tuning for Sensor Measurement
- 17-Dec-04 Issue of EDN 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 produce a sensor signal by altering an LC circuit's inductance or
capacitance.... [Design Idea by Colm Slattery, Analog Devices, Limerick, Ireland] |
|
Weighting Filter for Audio Measurements - For noise measurements. Ideal for
use with the AC Millivoltmeter above (circuit / schematic design added 6/06)
|
|
What I had to do to stabilize a VFO… - (electronic Circuit / Schematic
(added 02/05) |
|
Wide Swing Variable Crystal Oscillator - amateur radio construction
projects…. [from Peter Parker's website] |
|
Wide-range voltage regulator automatically selects operating-mode - 9-Jun-05
Issue of EDN Regulator seamlessly adapts to wide output range.... [Design Idea
by Joel Setton, Crolles, France; Edited by Brad Thompson and Fran Granville] |
|
Wien Bridge Oscillator is Reborn - 06/13/02 EDN-Design Ideas....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.... [Design Idea by Michael Fisch, Agere Systems, Longmont, CO] |
|
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 Idea by Jeff Smith, Analog Devices, Wilmington, MA] |
|
Wien Bridge Oscillator Rail-to-Rail Sine Wave Generator - Circuit Ideas for
Designers Application Notes Advanced Linear Devices, Inc....[App Note] |
|
Wien Bridge Theremin - (circuit / schematic added 2/03) |
| 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.
(electronic design added 05/06/07) [Design by Ramon Vargas 20-8-04] |
|
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).... [from Harry Lythall's website] |
|
Zener test circuit serves as DC source - 25-Nov-04 Issue of EDN 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, power-limited adjustable dc
source. Although conventional multimeters' resistance ranges typically apply enough
voltage to forward-bias most diodes, few can drive a.... [Design Idea by John Jardine,
JJ Designs, West Yorkshire, UK] |
|
|
