Voltage Controlled Pulse Width Oscillator

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The basic circuit operates at a frequency determined by R1, R2 and C1 and has a pulse width range of 0 to 100 percent.
The following diagram shows a basic circuit with an open collector output that would require a pull up resistor at its output. The parts values are the nominal values of the components used.
Note: This circuit is not suitable for high frequency operation, especially when using a second timer as the output stage. [...]
Read more Source: http://home.cogeco.ca/~rpaisley4/LM555.html

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