Rectangular and triangular generator (CB21333E)

This circuit, based on a 555, was found in a Popular Electronics from the 90s. The circuit has the frequency determined by R1, R2 and C1.

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FET dual analog switch (CB7247E)
We found this circuit in 1969 American documentation. FETs admit equivalents, as do transistors. The...
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Found in a Popular Electronics from 1992, this circuit was created to give effects to an...
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Both the field effect transistor and the integrated circuit of this 1970s circuit are no longer very...