Friend of mine has a 1995 Geo Prizm with an amp in the trunk. Amp connected to the stock stereo, speakers are connected to the amp. Recently the tape deck in the stereo broke, so he can't use the cassette adapter to play stuff off the laptop. To get around that, he plugs his laptop's audio-out straight into the RCA inputs on the amp.
That works fine as long as his laptop isn't plugged into the power inverter. If he plugs it into that, he gets a giant buzz in the speakers. This didn't happen when his laptop was going through the cassette deck though.
Summary of problem:
Power inverter <-- laptop --> cassette deck = fine
Battery power <-- laptop --> amp = fine
Power inverter <-- laptop --> amp = buzz
He thinks that it means his cigarette lighter isn't grounded, wants to know if this is correct and how he'd go about fixing it. His laptop's battery is kind of shot so he'd like to be able to power it from the inverter. Doesn't have time to take it to a shop at the moment because he's on vacation. Any ideas?
That works fine as long as his laptop isn't plugged into the power inverter. If he plugs it into that, he gets a giant buzz in the speakers. This didn't happen when his laptop was going through the cassette deck though.
Summary of problem:
Power inverter <-- laptop --> cassette deck = fine
Battery power <-- laptop --> amp = fine
Power inverter <-- laptop --> amp = buzz
He thinks that it means his cigarette lighter isn't grounded, wants to know if this is correct and how he'd go about fixing it. His laptop's battery is kind of shot so he'd like to be able to power it from the inverter. Doesn't have time to take it to a shop at the moment because he's on vacation. Any ideas?
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