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The Analoguer - The Analoguer is an audio filter that mitigates the harshness of
CD recordings using a signal processing technique called "windowing." As in the
author's Precision Preamplifier-Power Amplifier System, the opamps in this project are
also biased to operate in class A. Designed by Jan Meier (circuit design
added 03/08) |
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The Psychoacoustic Bass Enhancer - The device described in this article makes
signals below 60 Hz audible in loudspeakers and headphones that normally might not be
able to reproduce these frequencies, by synthesizing harmonics of these lowest tones
and by choosing the spectrum of these overtones to mimic the harmonic distortion of
ear's basillary membrane. Designed by Jan Meier (circuit design added
03/08) |
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The 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 constant, the circuit used an incandescent pilot
light to provide AGC (automatic gain control).....(design idea added 1/05) |
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Three phase sinusoidal waveform generator uses PLD - 10/12/06 EDN-Design Ideas:
Five ICs substitute for electromechanical three-phase source.....(design idea added
9/08) |
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Timers Generate Variable Sweep Frequencies - 08/01/96 EDN-Design Ideas: (design
idea added 5/02) |
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Tiny Crystal Oscillator (Wenzel) - High-stability gate oscillator uses two, 5-pin
SOT packageddevices (added 7/03) |
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Transconductance amp gives Oscillator reciprocal response - 04/17/03 EDN-Design
Ideas: 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.....(design idea added 1/05) |
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Transistor Organ (Aaron Cake) - This simple circuit can provide hours of enjoyment
as you learn tunes, play duets or just make some really weird sounds by pushing all
the buttons at once. You have probably seen this circuit before, it is fairly common.
I have seen it in several....designed by Aaron Cake (added 04/03/02) |
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Triangle & Square Wave Generator - Here is a simple triangle/squarewave generator
using a common 1458 dual op-amp that can be used from very low frequencies to about 10
Khz. The time interval for one half cycle is about R*C and the outputs will supply
about 10 milliamps of current. Triangle amplitude can ....(electronic schematic /
circuit added 4/02) |
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Triangle Squarewave Generator - (circuit / schematic design added 6/06) |
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Triangle waves drive simple frequency doubler - 11/23/06 EDN-Design Ideas: Extend
a function generator's range, and get a sine wave signal in the bargain.....(design
idea added 9/08) |
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Triangle-Waveform Generator (Randy LinscottO - The Tri-Waveform Generator can be
used for a number of different uses. The one that I use it for is a signal generator
to test circuits. The frequency range is 20 to 20khz. and can be adjusted by R1. The
duty cycle or the time that the waveform is high ….(electronic circuit added 4/05) |
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Trimless IF VCO: Part 1: Design Considerations - This App 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.... APP 711: Feb 05, 2001
(app note added 02/05) |
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Tuned Sine Wave Oscillators - National Semiconductor Application Note (app
note added 2/06) |
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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 ....Designed by Andrew R. Morris (added 09/05) |
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Two 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.....(design idea added 1/05) |
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Two Stage Chaotic Colpitts Oscillator for the UHF range - Electronic Circuit
design (added 06/07) |
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Two Tone Audio Oscillator use for SSB Tests - (electronic design / schematic added
2/05) |
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Two-Tone Train Horn - With this circuit you can electronically simulate the noise
of a diesel-train horn. The sound is triggered automatically as the train
reaches a desired place on the track so you can produce the sound as the train
approaches stations, level crossings, etc. The circuit can be built simply by using
one 556 or two 555 timers. The rest of the parts are readily available and not
critical. The output...(Tony van Roon's schematic / circuit added 2/07) |
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Ultra Low Voltage Crystal Oscillator Circuit using Active Loads - Circuit Ideas
for Designers Application Notes Advanced Linear Devices, Inc. (app note added
6/06) |
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Ultra Low Voltage Micropower Crystal Oscillator Circuit - Circuit Ideas for
Designers Application Notes Advanced Linear Devices, Inc. (app note added 6/06) |
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Ultra Low Voltage Nanopower LC Colpitts Oscillator Circuit - Circuit Ideas for
Designers Application Notes Advanced Linear Devices, Inc. (app note added 6/06) |
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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%. ….(designed by David A. Johnson) |
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Use of the CMOS Unbuffered Inverter in Oscillator Circuit - Texas Instrument
Application ReportSZZA043 January 2004 (added 02/05) |
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Using the ESG-D RF Signal Generator's Multicarrier, Multichannel CDMA Personality for
Component Test, Option UN5 - Aligent Application Note (app note added
04/05/06) |
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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 added 03/05) |
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VCO Produces Positive & Negative Output Frequencies - 12/25/03 EDN-Design Ideas:
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 provides a function that designers traditionally implement in analog
music-effects units, such as Bode/Moog frequency shifters.... (added 12/04) |
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Very Low Power Astable Multivibrator - This classic circuit draws only 200
nanoamps from a 1.5v supply ….(designed by David A. Johnson) |
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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. ….(designed by David A. Johnson) |
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Very Stable 40kHz GeneratorASCII 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) |
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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) |
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Video Generators - many test picture generation circuits (added 5/02) |
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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 added 02/05) |
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Voltage Controls Sine Wave Frequency - 08/17/95 EDN-Design Ideas: (design idea
added 3/03) |
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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) |
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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
produce a sensor signal by altering an LC circuit's inductance or
capacitance.....(design idea added 12/04) |
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Weighting Filter for Audio Measurements - For noise measurements. Ideal for use
with the AC Millivoltmeter above (circuit / schematic design added 6/06) |
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What I had to do to stabilize a VFO… - (electronic Circuit / Schematic
(added 02/05) |
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Wide range voltage regulator automatically selects operating mode - 06/09/05 EDN-Design
Ideas: Regulator seamlessly adapts to wide output range.....(design idea added 9/08) |
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Wide Swing Variable Crystal Oscillator - (electronic design / schematic added
2/05) |
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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 added 3/03) |
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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 added 01/04) |
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Wien Bridge Oscillator Rail-to-Rail Sine Wave Generator - Circuit Ideas for
Designers Application Notes Advanced Linear Devices, Inc. (app note added 6/06) |
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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) |
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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.... (added 9/04) |
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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).....(circuit / schematic design added 6/06) |
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Zener test circuit 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, 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 added 11/04) |
