We found this circuit in a 1965 publication by General Electric. The zener is 8.2 V x 1 W and the table shows the capacitor values according to the number of cylinders in the vehicle.
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...