Noise suppressor for intercom

The intercom had a noticeably irritating alternator whine after installing and testing, pitch increased with RPM. There’s an official noise suppressor from Rugged but is $40 before shipping, import duty and tax. Cheap amazon parts to the rescue, got one for £6 to test out (This one).

Took it to bits to ensure that it wasn’t an empty box (more of a risk on eBay, but also on amazon). There’s parts in there:

Wired this into the power wire on the intercom supply and grounded it to the chassis.

Works great, noise gone!

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