This circuit was found in the December 1992 Radio Electronis magazine. R2 is an NTC, there is a MOV protector or NTC thermistor. The current depends on the thermistor used.
The ICL8038 is a function generator that appears elsewhere on this site in various applications. The...
This circuit with 117 V output was found in a 1969 Electronic Design. Drive transistors admit...
The circuit shown in the figure is triggered by an input voltage determined by the setting of P1....