This receiver uses old transistors that are equivalent to BC548 and BC558. The photo diode is of any type. The receiver can be used on a highly sensitive audio link.
We found this circuit in Japanese documentation from the 1960s. Transistors are types of the time...
Many collectors of records, tapes and even audiophiles often keep recordings on tapes that...
This lockable two-position servo control system was found in documentation from the 1990s. The...