5V switch (CB8705E)

Found in a 90s EDN, this circuit makes use of period components. The maximum current depends on the MOSFET.

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Transistor Touch Sensor (CB25632E)
This circuit activates a relay when the conducting bars (probes) are held by a person. The circuit is...
1 A pulsator (CB13722E)
This circuit in the National Semiconductor Fast IC Power Transistor manual uses a special power...
Walk-Talkie (CB16502E)
This wireless intercom has a range of about 300 meters using an integrated circuit that is not...