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 circuit is from an American cookbook from 1977. The circuit generates a voltage of...
In the figure we have the simple way to implement the NO-OR or NOR function with common diodes and a...
We found this configuration in an integrated circuits manual. The transistor, which can be of any...