The circuit shown in the figure can be designed with more modern operational amplifiers, as it is from 1994 documentation by National Semiconductor. The power supply must be symmetrical.
The oscillator in the figure has its frequency determined by the crystal. The indicated value is...
Found in an American publication from the 90s, this circuit allows the supply of 3, 6 and 9 V...
This circuit was found in an application note of the Linear Technology LTC1145. The circuit can be used...