Night switch (CB8280E)

Found in a 1964 Philips manual, this circuit uses only passive components. The relay is a high voltage sensitive type.

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PUT neon shutter (CB6686E)
This circuit was found in General Electric documentation from 1964. It makes use of a PUT, called the...
1W Amplifier For Headphones (CB12960E)
The circuit shown in the figure is suggested by ON Semiconductor (www.onsemi.com), based on its...
Discharger limiter for Nicad (CB9546E)
This circuit for discharging NiCad batteries limits the current to a value that can be adjusted in the...