Sawtooth generator 555 (CB21229E)

This circuit was found in a Popular Electronics from the 90s. The frequency is given by R2 and C1.

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Extended range power control (CB7935E)
This circuit was found in a General Electric documentation from 1965. The circuit is full wave for...
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We found this circuit in the Texas Instruments' Linear Circuits Applications. It uses an...
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In the presented circuit it is possible to vary the frequency of the rectangular signal produced. This...