Shin-ei Mute Box [schematic]
Posted: 16 Jan 2018, 23:20
Saw this on a local listing and thought it might be of interest here.
Hmmm... maybe the led illuminates a double LDR which is symbolized by 4 dots inside a circle (in the left lower corner - in parallel to R19, R20) ?Nocentelli wrote:Schematic appears to omit the actual filter section I can't see how the envelope controls the filter sweep
I think you're right. I found a discussion about these 4 dots here, and it appears to be a dual photoconductive cell.tube-exorcist wrote:Hmmm... maybe the led illuminates a double LDR which is symbolized by 4 dots inside a circle (in the left lower corner - in parallel to R19, R20) ?Nocentelli wrote:Schematic appears to omit the actual filter section I can't see how the envelope controls the filter sweep