Unit gain (CB6727E)

This circuit was obtained from an Electronics World of 1969. General-purpose transistors can be used in this configuration.

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Differential amplifier (CB8990E)
This high input impedance circuit was found in American documentation from the 1980s. The power...
Dual trace for oscilloscope (CB5438E)
This circuit shows on the screen of an oscilloscope two signals alternately at a frequency that depends...
Listening Transmitter Via Power Grid (CB19325E)
This circuit transmits the signal taken from a telephone line to a receiver placed nearby (up to a...