ICL8038 Waveform generator
OK, not an 80’s chip, more 90’s but still a great waveform generator. Discontinued by Intersil but we’ve managed to source a clone.
Designed to generate sine, square and triangular waveforms, based on bipolar monolithic technology involving Schottky barrier diodes. ICL8038 is a voltage-controlled oscillator capable of producing frequencies between a millihertz and 100kHz.
Various circuit ideas in the datasheet