Found in a 90’s Popular Electronics, this circuit can use other power MOSFETs. The transformer has a primary according to the desired continuous voltage at the output.
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...