This circuit was found in a Ferranti documentation from 1969. The transistors are common types of the company at the time. Smaller equivalents may be used. The output power is of the order of 150 mW.
We found this circuit in an 80's Radio Electronics. It can still be easily assembled as the used...
April 2017 - Texas Instruments' new high-precision TMP468 sensor can now be obtained from Mouser...
In fact, the maximum output current of this source depends on the transformer which can be 6, 7.5, 9...