Comment on Audio enthusiast seeking safety advice
vk6flab@lemmy.radio 18 hours agoFellow computer geek here … also a radio amateur.
No idea what the availability of circuit diagrams is for your gear. In amateur radio equipment the user manual regularly has them, sometimes as big foldout sheets. I’d be surprised if they didn’t exist.
a_non_monotonic_function@lemmy.world 18 hours ago
Thanks for the information. The two units are by Fisher an FM-2421 and CC-3000.
I’m not seeing full circuit diagrams, but they do have some information on what to wire up.
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leftascenter@jlai.lu 17 hours ago
Antenna ground needs to be used for signal to be read properly.
Turntable audio grounding (different from electrical power grounding) may help prevent hums when the common 0V grounding passes by the power ground.
a_non_monotonic_function@lemmy.world 17 hours ago
That is what it looked like, but that surprised me. My turntable is more modern and doesn’t require a ground. As for the antenna, yes, that makes sense!
But am I misreading something… neither of those seems like an actual dangerous situation? Oddly enough the components that I would normally guess were more dangerous (specifically the pre-amp and amp) don’t seem to have a ground circuit exposed despite the two-prong set-up.
leftascenter@jlai.lu 17 hours ago
They don’t have a power ground to prevent hums. There might be a marginal risk if something comes loose in the amp, but your modern electrical cabinet would have a differential switch to save you in that case. I remember my audio engineer degrounding one of my audio components when in had the issue.
My guess for the audio ground is that older turntables had poorer electrical isolation and power lines were more noisy. For more technical explanations we need an old school audio engineer.