Found in documentation from the 1980s, this circuit uses a SG1524. It is an uncommon integrated circuit nowadays. The circuit provides a current of 20 mA with a symmetrical voltage between 15 and 18 V.
Found in Harris' 90s documentation, this circuit uses a zener as a stabilizer. The signals...
The circuit presented is based on the National Semiconductor's LM3524, a component not common...
This circuit is from a 1970 General Electric documentation. It can be found with variations on this...