This RIAA equalizer preamp was found in a 1990s schematic. The transistors are an old version of the BC549 that can be used as a replacement. Signal input and output cable must be shielded.
This transistor tester with different gain ranges was found in documentation from the 1980s. The...
This Japanese radio from the 60's has an output power of 200mW and is powered by a voltage of 9 V....
This circuit uses an unusual component today which is the integrated circuit. We found this...