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 simple receiver was found in a book on transistors from 1954. The coil determines the...
This simple receiver for listening on a crystal phone tunes the range of medium waves. The circuit...
The circuit in the figure is based on an LM101A; diodes can be replaced with equivalents. The...