Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
The mic will pick up audible noise from the relay clicks, and also electrical noise from arcing at the relay switch contacts, unless great care is taken to provide acoustic screening and electrical screening/suppression.
A directional mic might help. Also it could perhaps be mounted on a plastic/rubber foam pad and have a tubular sound-absorbing shroud. That shroud could itself have a grounded metal foil shroud to provide electrical screening. Unless it gets hot the relay could also be enclosed in sound-absorber and screening foil. A snubber should be connected across the relay contacts and all wiring to the relay should be as short as possible.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.