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.
The rectangular signal amplitude must not be higher than the T1 and T2 base voltage. Assuming a 10 V power supply, results that the amplitude will be 2.5V. IC2 is a good quality operational amplifier (200 V/us) that acts like a buffer between Schmitt input and output.
The triangle wave generator circuit can generate signals with frequencies up to 300 kHz. With the component values presented in the diagram the output wave frequency is 38 kHz. The frequency can be adjusted by changing C1’s value. The wave generator assembly absorbs around 8 mA, of which 5 mA runs thru IC2.
sent by Vladimir Rubik, Georgia.