Found in ancient American documentation this circuit uses semiconductors from the thyristor family such as SCRs, Triacs and unijunctions. The circuit can control loads up to 550 W with the indicated triacs.
This 1980s circuit uses components of the era that can be replaced by modern equivalents. For the FET we can...
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This is a traditional version of electroscope with FET. We found it at Popular Electronics. The...