The setting of this power supply is only 0.1%. We found it in a 1969 US documentation. Transistors may be current equivalents. Note the use of symmetrical power supply.
Two operational amplifiers are used in this source obtained in an American documentation...
The original document is from Philips, but now available from NXP (www.nxp.com) which is the...
This circuit can operate with different voltages, depending on the zener used. We found it in a...