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Converters: Voltage to Frequency, Page
1 Voltage Controlled Oscillators (VCO) VCO; Voltage to Frequency Converters: #'s - AB - KL - UV - Z
Last Updated on:
Friday, March 23, 2012 04:29 PM
Circuits Designed by Dave Johnson, P.E. :
40KHz Voltage
to Frequency Converter
This circuit was designed to frequency modulate a 40KHz carrier, using human voice
frequencies. A common flip/flop is used at the core of the circuit.
200MHz -
400MHz VOLTAGE controlled OSCILLATOR
If you need a clean emitter coupled logic (ECL) type signal between 200MHz and
400MHz this circuit works fine. It uses four voltage controlled capacitors to change
the frequency.
Air
Transparency Monitor, Xenon Flash Receiver
I designed this circuit many years ago to monitor the quality of a mile long column
of air for future optical communications experiments. The transmitter system
(circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch
fresnel lens at the transmitter end and a matching 12 inch lens with a PIN photo
diode at the receiver. The receiver system was connected to a weather station and a
computer to collect the changes in intensity of the light flashes under different
weather conditions. It has the potential for a 30+ mile range. I have also used this
system to conduct cloud bounce experiments.
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.
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
“Hippasian” nonlinear VFC stretches dynamic range -
19-Feb-09 Issue of EDN A voltage-to-frequency converter uses
square roots to extend dynamic range by orders of magnitude.....
[Design Idea by W Stephen Woodward, Chapel Hill, NC]
0.02% V/F Converter Consumes Only 26 µA - 07/04/96
EDN-Design Ideas.....Figure 1 shows a voltage-to-frequency (V/F]
converter that produces a 0- to 10-kHz output for an input range of 0
to 5V. Linearity of the converter is 0.02%, and gain drift is 60
ppm/8C. The maximum current consumption is only 26 �A, 100 times lower
than currently available units. To understand the circuit's operation,
assume..... [Design Idea by Jim Williams, Linear Technology, Milpitas,
CA]
10 Khz VFC uses Charge Pump Variation - 04/09/98 EDN-Design
Ideas.....A diode-capacitor charge pump is the starting point for many
voltage-to-frequency-converter (VFC] designs. The circuit in Figure 1
uses a variation on that classic theme to achieve linearity less than
0.05%, micropower operation of.....several circuits included, scroll
the find this one..... [Design Idea by Stephen Woodward, University of
North Carolina, Chapel Hill, NC]
1-Hz to 100-MHz VFC features 160-dB dynamic
range - 1-Sep-05 Issue of EDN Transform voltage to current over
wide frequency, amplitude..... [Design Idea by Jim Williams, Linear Technology
Corp; Edited by Brad Thompson and Fran Granville]
200mhz-400mhz Voltage Controlled Oscillator (VCO) - If you need a
clean emitter coupled logic (ECL) type signal between 200MHz and 400MHz this
circuit works fine. It uses four voltage controlled capacitors to change the
frequency..... [Designed by David A. Johnson]
40kHz Voltage to Frequency Converter - This circuit was designed to
frequency modulate a 40KHz carrier, using human voice frequencies. A
common flip/flop is used at the core of the circuit. …. [Designed by David A.
Johnson]
Air Transparency Monitor, pg 1 - I designed this circuit many years
ago to monitor the quality of a mile long column of air for future optical
communications experiments. The transmitter system (circuit 72 below) uses a
powerful xenon flash in conjunction with a large 12 inch fresnel lens at the
transmitter end and a matching 12 inch lens with a PIN photo diode at the
receiver. The receiver system was connected to a weather station and a
computer to collect the changes in intensity of the light flashes under
different weather conditions. It has the potential for a 30+ mile range. I
have also used this system to conduct cloud bounce experiments..... [Designed
by David A. Johnson]
Air Transparency Monitor, pg 2 - This is Page 2 of the air
transparency monitor receiver circuit..... [Designed by David A. Johnson]
AN-280: Mixed Signal Circuit Technologies - AN-280 Analog Devices
Application Notes.....[App Note]Considers problems which arise when reality (&
Murphy) intervene in a design which orwise seems satisfactory in terms
of ory and modeling.
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