Crystal Pierce Oscillator (CB6149E)

This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate crystals. Components are still common today.

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Audio Multivibrator (CB12037E)
This traditional configuration was obtained in a 1986 publication. The speaker can be replaced by a...
100kHz Astable (CB5431E)
We find this circuit in an old documentation, but it can be implemented with modern equivalent...
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The circuit shown in the figure is similar to the previous one (CB16096E), except that two...