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The circuit is a triangle waveform generator that uses as few parts as possible.
A 555 timer IC, 2 resistors and two capacitors make the triangle wave.
The IC is connected in a 50% duty-cycle astable square-wave oscillator circuit.
The square-wave output is fed from pin 3 of the IC to an RC shaping circuit.
This triangle wave generator is made with a trigger Schmitt that converts a triangle wave into a rectangular one used to charge and discharge a capacitor through current sources. The positive current source T1 provide the charging and T2 the discharging. The trigger Schmitt is made from OR-EXCL gates IC1a and IC1b.
