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6 Useful Voltage Controlled Oscillator Circuit Explored ...
https://www.homemade-circuits.com/voltage-controlled-oscillator-circuit/
As the name suggests, a voltage controlled oscillator or a VCO circuit is an oscillator circuit whose output frequency can be controlled or varied through an adjustable control voltage input. This means, if the input control voltage is increased, the output frequency will increase proportionately, and vice versa.
Simple Voltage Controlled Oscillator Circuit
https://makingcircuits.com/blog/simple-voltage-controlled-oscillator-circuit/
The circuit as shown in Figure below presents a 555 as an extremely simple, voltage-controlled oscillator (VCO). The VCO’s output frequency (U1) differs contrariwise with the input voltage. Using a 1 V input, the oscillator’s output frequency is around 1500 Hz. If you supply a 5-V input, the oscillator’s output frequency dips to about 300 Hz.
A look at the VCO's of some famous analog synthesizers.
https://secretlifeofsynthesizers.com/the-vco/
This circuit provides a precise current that causes the VCO to ideally double in pitch each for each volt that is applied to the input from the keyboard. The advantage of this system is that you can have many octaves of range with a relatively small control voltage from the keyboard – an 8 octave keyboard only needs 8 Volts to cover it’s range.
Voltage-Controlled Oscillator (VCO) - Synthesizer Academy
http://synthesizeracademy.com/voltage-controlled-oscillator-vco/
The most common source is called a Voltage-Controlled Oscillator, or VCO for short. These modules produce waves that range from simple to complex, depending on the model. Some have a single output and a switch that lets you choose between waveforms, and some have multiple jacks that let you access several different waves simultaneously.
Voltage Controlled Oscillator (VCO)- VCO Circuit ...
https://www.youtube.com/watch?v=AJle_UXuMnk
This video is about the voltage controlled oscillator circuit design (VCO). Here you will find the working animation of the voltage controlled oscillator.Wav...
Audio VCO design | Electronics Forums
https://www.electronicspoint.com/forums/threads/audio-vco-design.214106/
As part of a larger system, I need to design and build an audio VCO which will produce tones ranging from around 50Hz to 4KHz or so when the applied DC input voltage changes from 0.5volts to 2.5volts. This will be used simply as a tuning aid for visually impaired users so the actual voltage/frequency relationship, and waveform produced, is
Good IC for a VCO for audio applications? | All About Circuits
https://forum.allaboutcircuits.com/threads/good-ic-for-a-vco-for-audio-applications.128754/
Actually making a VCO involves controlling an oscillator (relaxation osc, like 555 timer, or equiv.) with an input voltage. Having looked into the schematics of many old-school analog synthesizers, the paths vary, but most look like this: convert the voltage to a current, then use that current to determine the ramp of a capacitor-charge circuit.
Synth Schematics --::VCO 3::--
https://www.schmitzbits.de/vco3.html
VCO 3 . Introduction After getting inspired by other designs and various discussions on the Synth-DIY mailinglist, I decided to build a new VCO in late 1998, and this is the result. The main difference to my other VCO schematics is that it is integrator based, has triangle and sine wave outputs, and makes use of a 2SC1583 for the exponential current source.
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