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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, February 05, 2010 10:05 AM
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:
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, 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. .(designed by David A. Johnson)
AN-280: Mixed Signal Circuit Technologies - AN-280 Analog Devices Application
Notes (app note added 2/06) Considers problems which arise when
reality (& Murphy) intervene in a design which orwise seems satisfactory in
terms of ory and modeling.
