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Voltage to Frequency Converter Circuits
Voltage Controlled Oscillators (VCO)
Designed by David A. Johnson, P.E.
Last Updated on:
Monday, April 21, 2008 04:19 AM
Master Category List - Dave's Circuits
More Converter Circuits
DC to DC Power Supplies
Converters: Frequency to Voltage
Converters: Period to Voltage
Converters: Sine to Square Wave
Converters: Voltage Converters: Voltage to
Frequency
High Voltage Power Supplies Switchmode Power
Supplies Voltage Controlled Oscillators
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- 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.
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- 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.
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- CMOS SCHMITT TRIGGER IC MAKES VCO
By changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a range of 50:1. A 74HCU04 inverter is used at
the output of the 4584 to maintain a constant TTL logic level signal.
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Light to Frequency Converter
This circuit uses a CMOS version of the classic 555 timer, to form a light intensity to frequency converter. A small PIN photo diode is used as the light detector. The pulses
produced are short, so in some applications you may want to stretch them or feed them through a flip/flop to produce a square wave signal. Although the circuit shown is designed
for a 5v supply, it could operate from almost any voltage from 3v to 15v.
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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.
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More Converter Circuits
Master Category List - Dave's Circuits
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