This is one of the first radios with an integrated circuit. The circuit is from a Radio Electronics from November 1969. The circuit is powered by a 9 V battery.
This RIAA equalizer preamp was found in a 1990s schematic. The transistors are an old version of...
This 555 circuit was found in the October 1992 issue of Radio Electronics magazine. A power stage...
We found the circuit for this commercial radio in Japanese documentation from the 1960s. The...