Scale Expander for 12V Meter (CB21330E)

This circuit was found in a QST from the 1990s. The circuit expands the scale of a 10V instrument to measure 20V.

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...