Sine to square converter (CB7329E)

Using a 555 this circuit was found in old documentation, but it is still valid.

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Shortwave Converter (CE26331E)
We found this circuit for receiving shortwave on a mediumwave radio in a 1986 Hobbyst Electronics PE. The...
555 Touch Switch (CB19026E)
The sensitivity of this circuit depends on the 22 M resistor. The circuit is from old Texas...
Crystal Pierce oscillator (CB23728E)
The oscillator illustrated in the figure can be used to generate signals ranging from 100 kHz to a...