This circuit generates rectangular signals from 2 Hz to 20 kHz using an operational amplifier. The circuit is from 1984 Radio Electronics. The power supply must be symmetrical.
This circuit was obtained in the Linear Applications Handbook of the National Semiconductor of...
This circuit is indicated for audio tests, the tracks being selected by the capacitors. The...
This circuit can be implemented with more modern operational amplifiers like the 741 and its...