This circuit makes use of a stroboscopic tube, a component that no longer exists today. The circuit is from the 70's and can be adapted to use mains voltage.
This circuit uses a common diode as sensor. The output goes from 0 to 10 V with the temperature change in...
April 2017 - Microchip's new PIC18LF66 and PIC18LF66 microcontrollers with 83 instructions, 31...
This circuit can work with almost any JFET. The circuit is from an Electronics Now from April...