This CMNOS crystal-based circuit generates a 2 Hz signal. It was found in the October 1994 issue of Electronics Now. The output signal is square.
The circuit shown bellow is na áudio amplifier using Darlington transistor in a complementary...
An OR gate can be improvised using NAND gates of a 4001 as shown here. The diodes are...
Found in old American documentation, this circuit can use crystals between 27.5 and 33 MHz...