Low cost copy of the well known Taiwan Blue series switches.
The SA571 is a versatile dual gain control circuit in which
either channel may be used as a dynamic range compressor or
Marshall 1/4 inch jack PC mount stereo, switched, 4 terminals
Original Fender Blues Junior Potentiometer 250K Lin
Original Fender Blues Junior Potentiometer. 25K Linear.
Xvive Optocoupler VTL 5C3
The MAX7426/MAX7427 5th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7426) or +3V (MAX7427) supply. The devices draw only 0.8mA of supply current and allow corner frequencies from 1Hz to 12kHz, making them ideal for low-power post-DAC filtering and anti-aliasing applications. They can be put into a low-power mode, reducing supply current to 0.2µA.
NE 570 – Complete Compressor and Expandor in One IC, DIP16