One-Tube Opto Comp

[sahib]

This will not work on my side of the great pond.

Two back to back transformers will do. Like the one Jacob did for his G9. I had designed a PCB for it (over 10 years ago). I still have some left. It was designed for a particular PCB mount transformer that I have but an off-the shelf with 2 x115 : 2 x 18 can also be used. Both the LV and HV outputs are fused.



However, this thread reminded me an article in an old Audio magazine that I had. I scanned it today. Hope it stimulates something.

 

[OneRoomStudio]

Two back to back transformers will do. Like the one Jacob did for his G9. I had designed a PCB for it (over 10 years ago). I still have some left. It was designed for a particular PCB mount transformer that I have but an off-the shelf with 2 x115 : 2 x 18 can also be used. Both the LV and HV outputs are fused.

View attachment 116333

However, this thread reminded me an article in an old Audio magazine that I had. I scanned it today. Hope it stimulates something.

Very cool! I knew this wasn’t a novel idea, but funny to see something so similar from so long ago. Did the “Raysistor” predate the Vactrol?

 

[ruffrecords]

Very cool! I knew this wasn’t a novel idea, but funny to see something so similar from so long ago. Did the “Raysistor” predate the Vactrol?

I found a datasheet for the Raysistor:

https://www.effectrode.com/wp-content/uploads/2019/07/Raytheon_TheRaysistor.pdf

Cheers

Ian

 

[sahib]

Very cool! I knew this wasn’t a novel idea, but funny to see something so similar from so long ago. Did the “Raysistor” predate the Vactrol?

I don't really know the history of it but I think it is round about the same time. Two different brands applying the same principal.

 

[OneRoomStudio]

Ok, made a few more tweaks. Is this the correct way to use the CCD? How do I determine the bias voltage on the grid or the voltage on the cathode? I have a feeling that the 50V limit on that diode is not going to be enough. Does anyone have any good resources where I can learn more about using a CCD as a current source in this kind of circuit?