you'll probably like the next product which Rochey and I are working on...
solderspongebob said:Hi there! You'll probably want this page: http://recording.org/users/kev/T4B.htm
Also if you do a search on here you'll eventually find an entire thread dedicated to making T4b's, but the conclusion of which was that you have to buy a quantity of silonex optos and test them all to get ones with the right characteristics to behave in a usuable way.
(However, if you find a new way of doing it please let us know - I have a D-LA2A getting slowly built and will eventually need T4b's also!)
Best of luck.
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