This circuit uses an amplifier from National Semiconductor, uncommon nowadays. The numbers in parentheses are for the second channel. The circuit is suitable for old tape recorders.
This configuration, found in many other circuits in this section, was obtained in a 1970s American...
This circuit for incandescent lamps was found in an American documentation from the 80s. The...
Found in old English documentation this circuit can be made with a BF245 or equivalent. Coils are...