- Dayton, Ohio, United States
- US $39.99
- Jan 29th
(20) NOS Vactec Vactrol Incandescent Bulb to CdS Cell LDR Optoisolator/Optocouplers. I bought these years ago with the idea of using them in guitar effects, compressors, etc. They are well suited to this purpose as they use an incandecent bulb (a grain of wheat bulb) as the light element, giving similar rise times as the old 1960s-70s equipment that originally used them.