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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Fast Photo Darlington (CB14647E)
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Thermostat (CB24644E)
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EF MOSFETs Series with Diodes Fast Body (COM042E)
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