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opto channel switching

4/10/2000 6:11 PM
steveR	opto channel switching Can anyone give me a quick rundown about how to use an optoisolator for channel switching? I've got a salvaged SF Bandamaster chassis that I want to rebuild as a two channel switcher. I'm going to use the trem tube as a another gain stage / cathode follower and thought that I could use the opto for channel switching. I've got a 6vdc mechanical relay, but have a sense that switching with the opto would pose fewer problems for switching noise. Is this true? Opto basics: What kind of voltage does the bulb require? Is this just 6.3v? Does the resistance go up and look like an open circuit or go down and look like a short when power is applied? My thought was to run both channels in parallel allowing the high gain channel to swamp out the clean channel when in the high gain setteing, and then shunt the lead channel to ground for clean. Any good articles or schems to reccommend? Thanks. steveR

4/10/2000 6:11 PM

steveR

opto channel switching

Can anyone give me a quick rundown about how to use an optoisolator for channel switching? I've got a salvaged SF Bandamaster chassis that I want to rebuild as a two channel switcher. I'm going to use the trem tube as a another gain stage / cathode follower and thought that I could use the opto for channel switching. I've got a 6vdc mechanical relay, but have a sense that switching with the opto would pose fewer problems for switching noise. Is this true?

Opto basics: What kind of voltage does the bulb require? Is this just 6.3v? Does the resistance go up and look like an open circuit or go down and look like a short when power is applied?

My thought was to run both channels in parallel allowing the high gain channel to swamp out the clean channel when in the high gain setteing, and then shunt the lead channel to ground for clean.

Any good articles or schems to reccommend?

Thanks.

steveR

Replies:

Ryan Basiclly this is what the SLO does ... -- 4/10/2000 10:33 PM