Quick Adder (CB20155E)

This is a factory circuit from an 80's manual. The circuit can be implemented with modern operationals and the power supply must be symmetrical.

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Commercial Portable MW Radio AT235 (CB18430E)
This 6-transistor receiver was manufactured in Japan in the 60s. The circuit is superheterodyne and has a 6V...
Digital Capacitor Meter (CB17506E)
This circuit was found in a 1986 documentation and it may be difficult to obtain some of its...
Low Loss Dimmer (CB5295E)
This circuit was found in a 1980s documentation. The low voltage circuit uses a PUT. Transistors can...