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 low distortion circuit was found in a 1964 Electronic Design. The transistor admits...
This ingenious circuit was found in a 1990s Popular Electronics. The oscillator is a 555 and the...
This short circuit protection circuit accelerates the blown fuse in case of an output overcurrent. The...