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 car alarm was found in a 1965 General Electric manual. The SCR can be commonly used with the...
This sophisticated decade of benchtop resistors was found in the November 1989 issue of Radio...
This is one of the many possible siren configurations for the 555 integrated circuit. We found it in...