This circuit was found in an Electronic Design from the 90s. The circuit uses a type J thermocouple that can measure from -50 to + 100º C. Power is provided by a 3 V lithium battery.
This Schimitt trigger with MOS transistors was found in an old American documentation. Modern...
This circuit, found in a 1979 documentation, consists of a small inverter that applies a voltage to...
This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with...