This simple source with zener regulation is ideal for experimental projects with operational amplifiers. Other voltages can be obtained by changing the zeners and the transformer.
Texas Instruments recently introduced the temperature sensors LM73 / LM73-Q1 for Surface Mount...
The circuit shown is from an old publication, from the 70s, but can be assembled with TIC106 SCRs...
This circuit is indicated to operation with piezoeletric transdicers or other with high impedance...