Laptop Hum?

Ever got that annoying hum when connecting your laptop to an amplifier or other sound system? It’s very common and has a lot to do with the laptop power supply (you’ll notice the problem disappears when you unplug the laptop power supply and run on battery instead). The other solution is a laptop isolator (sometimes called a ground loop isolator)which you can buy on eBay or….you can make your own with 2 fax modem transformers which should be specified as 1:1 600 Ohm (will cost around £5 if you hnt around on eBay) and a few RCA input/output connectors. This is my home made version which works a treat.

isolator photo

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