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NTE864? Integrated circuit. Precision waveform generator, according to ChipDocs.
I have a fuzzy recollection of Exar making this.
If its what i think, it has triangle, square and sine wave outputs, and variable duty cycle. It used to be the heart of function generators in the hobby magazines in the 1970's and 1980's
The NTE864 is a precision waveform generator in a 14 Lead DIP type package capable of producing sine, square, triangular, sawtooth and pulse waveform. Its operating frequency can be selected over eight decades of frequency, from 0.001Hz to 200kHz. The frequency of oscillation is highly stable over a wide range of temperature and supply voltage changes. Both full frequency sweeping as well as smaller frequency variations (FM) can be accomplished with an external control voltage. Each of the three basic waveforms, i.e., sinewave, triangle and square wave outputs are available simultaneously, from independent output terminals.
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