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Voltage Controlled Oscillator (VCO) - Circuit Digest

    https://circuitdigest.com/tutorial/voltage-controlled-oscillator-vco#:~:text=Frequency%20%28f%29%20%3D%201%20%2F%202%CF%80RC%20Hence%20in,based%20on%20the%20value%20of%20the%20Input%20voltage.
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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/
    Joined Feb 6, 2013. 131. Oct 27, 2016. #5. The easiest circuit is a square wave and an integrator, which turns the square wave into a triangle wave. The square wave can come from any source of VCO, but the integrator might give you issues as you increase frequency due to the fact that it will shrink with shorter square wave pulses.

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 not

Voltage-Controlled Oscillator (VCO) | The Synthesizer …

    http://synthesizeracademy.com/voltage-controlled-oscillator-vco/
    Volts per Octave: Each volt equals 1 octave. If 2V=A2, 3V=A3, 4V=A4, etc. This scheme was popularized by Moog in the ’60s. Today it is probably the most popular scheme, and is used in most modern modular synths. Hertz per Volt: Each octave equals a doubling or halving of the voltage. If 2V=A2, 4V=A3, 8V=A4, etc.

INTRODUCTION TO FM USING A VCO

    https://eng.auburn.edu/~roppeth/courses/TIMS-manuals-r5/TIMS%20Experiment%20Manuals/Student_Text/Vol-A2/A2-10.pdf
    Introduction to FM using a VCO A2 - 91 T1 before plugging in the VCO, set the mode of operation to ‘VCO’ with the on- board switch SW2. Set the front panel switch to ‘LO’. Set the front panel GAIN control fully anti-clockwise. T2 patch up the model of Figure 2. T3 use the FREQUENCY COUNTER to monitor the VCO frequency. Use the front panel control fo to set the frequency to 10 kHz.

Voltage Controlled Oscillator-VCO theory and …

    https://www.circuitstoday.com/voltage-controlled-oscillator
    VCO (Voltage controlled oscillator) Voltage controlled oscillator is a type of oscillator where the frequency of the output oscillations can be varied by varying the amplitude of an input voltage signal. Voltage controlled oscillators are commonly used in frequency (FM), pulse (PM) modulators and phase locked loops (PLL).

small audio VCO | Electronics Forums

    https://www.electronicspoint.com/forums/threads/small-audio-vco.24762/
    Anyone know of a small,low power, SMT, audio frequency voltage controlled oscillator IC? I'm trying to generate a swept sinewave from 100Hz to 10Khz driven from a 12 bit DAC. I've found a bunch of serial input types, but unfortunately I'm out of I/O on this design - just one DAC remaining available. TIA Bob

74S124 High Frequency VCO with Varactor – Simple Circuit ...

    https://www.simplecircuitdiagram.com/2555-74s124-high-frequency-vco-with-varactor/
    Use C1 = C2 = 47pF for 6.8 to 72 MHz, and use C1 = C2 = 22nF for 2.2 to 65 MHz. R1 and R2 are large enough to isolate ground and control voltages from the timing capacitors. The potentiometer is used as a voltage divider for controlling the capacitance of varactor, thus controlling the frequency of this VCO circuit.

VCOs with Single Output | Analog Devices

    https://www.analog.com/en/products/rf-microwave/vcos-plos/vcos-with-single-output.html
    VCOs with Single Output. Analog Devices voltage controlled oscillator (VCO) portfolio supports a broad range of applications. Our extensive product line includes multiple devices that offer excellent phase noise performance over temperature, shock, and process due to their monolithic structure. We also offer ultrasmall size, low phase noise, low power consumption, and wide …

choosing an audio VCO for making an analog …

    https://www.reddit.com/r/synthesizers/comments/1u9fny/choosing_an_audio_vco_for_making_an_analog/
    When it comes to audio frequency I don't quite get what you mean. The frequency range determines the range of pitches you can get out of the VCO. 400Hz to 700Hz is very narrow; it doesn't even cover a whole octave (remember that A4 is 440Hz and the frequency halves for each octave below that and doubles for each octave above).

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