Light beam switch (CB21413E)

This circuit was obtained from a 1965 General Electric SCR manual. The components are from the period.

50 W amplifier (CB16700E)
This 1992 circuit uses an integrated circuit not common today. The Sanyo integrated circuit must...
Digital Watch MA1010 (CB19859E)
This was one of the National Semiconductor clock modules very popular in the 70s and 80s. In the...
D - A Converter (CB16016E)
This digital / analog converter shield is suggested by MOTOROLA and is based on an operational amplifier...