'Push button memory (CB7243E)

This circuit was found in an American documentation from 1969. The circuit memorizes when a command pulse activates the relay.

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Transistor as diode (CB23558E)
In the figure we have a practical idea for using the good junction of a partially burned...
500 mW Amplifier Powered by the Grid (CB20039E)
This amplifier is from Motorola documentation from the 70s. The circuit uses transistors from the...
70 V Regulator (CB21171E)
This positive voltage regulator with 70 V output was found in a National Semiconductor manual from...