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 old circuit excites lamps but can be modified to excite high-power LEDs or other loads...
We found this circuit in old documentation. Modern equivalent operational amplifiers can be used....
The purpose of this circuit is to regulate the output voltage of a source at 11.4 V or other...