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2017-08-22 06:41  
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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.

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

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