4093 Sine Square Converter (CB26335E)

Found in a Popular Electronics from the 90s, this circuit operates up to about 5 MHz input.

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Infrared Remote Control Transmitter (CB18696E)
This transmitter for modulated infrared remote control was found in documentation from the 90s....
Secret Combination (CB9879E)
This game aims to make you discover which is the combination of activated switches that make the...