Found in a 1966 documentation, this circuit monitors the operation of an air conditioning system. Transistors are from the time.
This 1992 circuit uses an integrated circuit not common today. The Sanyo integrated circuit must...
This was one of the National Semiconductor clock modules very popular in the 70s and 80s. In the...
This digital / analog converter shield is suggested by MOTOROLA and is based on an operational amplifier...