Posted on Apr 15, 2012

The pin 3 output of the 566 can be used to provide different charge and discharge currents for Cl so that a sawtooth output is available at pin 4 and a pulse at pin 3. The pnp transistor should be well saturated to preserve good temperature stability. The charge and discharge times can be estimated by using the formula shown.

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Where Rr is the combined resistance between pin 6 and Ycc for the interval considered.

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