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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 provides a function that designers
traditionally implement in analog music-effects units, such as Bode/Moog frequency
shifters..... [Design Idea by Henry Walmsley, Farnborough, UK] |
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VCO Supply Touts Low Noise - 10/28/99 EDN-Design Ideas EDN is migrating
links. This link is not verified. Search the "title" + "EDN" for new link.
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VCO test 1000MHz...1500MHz - .... |
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VCO test 1300MHz...2400MHz - .... |
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VCO uses programmable logic - 14-Nov-02 Issue of EDN A VCO
(voltage-controlled oscillator] is an analog circuit, so you cannot find it in the
libraries for the design of digital programmable chips. When you need such a
circuit for synchronization or clock multiplication, you need to find a circuit
that works with the standard digital functions, such as AND and NAND..... [Design
Idea by Susanne Nell, Breitenfurt, Austria] |
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VCO 1000MHz...1500MHz - .... |
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VCO 1200MHz...2400MHz - .... |
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VCO 144MHz...146MHz - .... |
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VCO 15MHz...25MHz - .... |
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VCO 350MHz...1000MHz - .... |
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VCO 450MHz...1000MHz - .... |
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Versatile Monolithic V/Fs can Compute as Well as Convert with High Accuracy -
National Semiconductor Application Note (app note added 2/06) |
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VFC Makes Simple Capacitance Meter - 06/07/01 EDN-Design Ideas.....When
you develop the prototype of a circuit using capacitors or when you replace an
old, defective capacitor with a new one, you often need to know the value of the
capacitor you use or replace. At times, the values printed on the capacitors are
no longer readable. Also, the wide tolerance..... [Design Idea by K Suresh, Indira
Gandhi Centre for Atomic Research, Kalpakkam, India] |
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Volt/F Converter Draws Flea Power - 04/24/97 EDN-Design Ideas.....The
V/F converter in Figure 1 is unique because it draws less than 30 µA from one
unregulated supply while converting bipolar input voltages. It produces three
CMOS-compatible,0to 10-kHz outputs one (F+]that becomes active when the
input voltage is positive, another (F]that takes..... [Design Idea by W Stephen
Woodward, University of North Carolina, Chapel Hill, NC] |
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Voltage Controlled Switch using 555 - In this circuit the 555 timer is
used in a novel way, as a voltage controlled switch….(Circuit designed by Miroslav
Adzic added 6/07) |
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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] |
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Voltage to Current Conversion Apex-AN13 - Apex App Note.....
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Voltage to Frequency Converter + 1us LED Pulse Driver - This circuit
receives the signal from the above amplifier and launches powerful 1uS infrared
light pulses from a low cost LED that are frequency modulated by the audio
information. The 10KHz center frequency of the pulse stream is low enough so a
standard infrared LED can emit ten times more light than conventional long pulse
techniques. The circuit is described in more detail in the transmitter section of
my Handbook of Optical Through the Air Communications. …. [Designed by David A.
Johnson] |
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Voltage-Controlled Resistor - A common request from SPICE users is a
voltage-controlled resistor. Although there's no SPICE component that directly
models this device, you can easily put one together. There's several ways to do
it. You can even extend the device to model more complex resistance functions like
RTDs and thermistors.....(spice design added 02/09) |
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Voltage-controlled stereo Signal attenuator - This is a
voltage-controlled stereo signal attenuator. A 30-volt DC control voltage (the
300-ohm pot functions as a lamp-dimmer) energizes a lamp (I'm guessing the General
Electric #313 is an ordinary miniature incandescent bulb) which radiates light
energy onto the two "LOR 1-C" components. These are variable
resistors.....(Circuit design added 7/06) |
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Voltage-to-current converter makes a flexible current reference -
18-Sep-03 Issue of EDN The voltage-to-current converter in Figure 1 can both
source and sink current. The circuit isflexible than some traditional current
references that require different topologies for current sourcing and sinking.
Also, you can easily adjust the value of the current reference by simply adjusting
the circuit's input voltage..... [Design Idea by Art Kay, Texas Instruments,
Tucson, AZ] |
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Voltage-To-Frequency/Frequency-To-Voltage Converter - Microchip
Application Note Published 12-Nov-02 (app note added 2/06) |
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Wide Band Zero Cross Detector - This circuit was designed to convert a
low amplitude 40KHz signal into a clean square wave signal. It will work
with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak.
The input frequency can range from a few kilohertz to about 150KHz. …. [Designed
by David A. Johnson] |
