This 8 W amplifier with germanium transistors was found in a Japanese documentation from 1967. The circuit is of the commercial type and is powered by two 12 V batteries or by a symmetrical source.
This high voltage source for gas LASER was found in documentation from the 1990s. The circuit is...
Equivalent comparators can be used on this AND gate. We found it in a Popular Electronics from the 90s. Power...
A NOR gate can be improvised using one NAND gate of a 4011 as shown here. The diodes are...