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.
The transistors of this circuit found in a 1965 magazine can be the BC558 and the sensitive 12 V x...
This circuit detects a light window using two operating systems. The circuit is from a July 1992...
This full-wave circuit was obtained in Motorola's 1974 unijunction transistors manual. The circuit...