VTL5C3 optocoupler

Optocoupler (also called a vactrol) used in many tremolo and compressor circuits such as the Tremulus Lune and Flatline Compressor for more consistent performance than discrete LED & LDR pairs. Response time, on resistance and off resistance are fairly average, making it the most versatile among the VTL5C series. This is the Xvive reissue of the part formerly manufactured by Perkins-Elmer, Excelitas and Vactec under the same name.

Note: These are marked with a yellow dot, but are not otherwise labeled in a way that differentiates them from others of the VTL series such as the VTL5C6.