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Title: Variable AC Fuse Circuit Post by: WA2SQQ on August 26, 2019, 09:29:07 PM I'm wondering if anyone has a circuit for a variable AC fuse circuit? I'd like to have a circuit that would be variable from .5A to at least 5A. Would come in handy when working on some old equipment.
Title: Re: Variable AC Fuse Circuit Post by: Opcom on August 27, 2019, 08:22:51 PM For fine adjustment might be like a job for a 'triggerable' DC fuse, or foldback, or current limiter, maybe including a 'held-on' relay that drops out. Many options. There should be lots of circuits around for that. I think the simpler ones are for DC. But they could be used with a bridge rectifier for AC current. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Maybe a small cap across the +/- of the bridge to stop noise triggering it. Not my idea, been around for decades. There's a good idea in this video https://www.youtube.com/watch?v=FlRQTPFRUV8 |