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.
If I get what you are asking, telephone lines use 48 V because is in the limit considered safe for handling (low voltage) and negative because that way reduces electrolytic erosion of copper wires often wet when underground or rains.
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