Found in Unitrode documentation from the 1980s, this circuit makes use of PUTs, currently common components. The circuit must be powered with voltages around 15 V.
The circuit shown in the figure below is suggested by ON Semiconductor (www.onsemi.com), based on...
This circuit is part of an article published in the March 1990 issue of Radio Electronics...
September 2016 - It can be obtained from Mouser Electronics the new ADC AD7779 from Analog Devices with...