ren_zokuken01 Posted May 2, 2013 Report Share Posted May 2, 2013 since i still don't have my PC back (thought i am very, very very, very anxiously looking forward to getting it back ASAP), i play my MP3 music from my cheap cellphone.i also happen to have this alarm radio that's got a big speaker. it's got no audio input jack, though. now basically, i want to add a 3.5mm audio input to it. seems easy enough, but my question is, say if i have the radio on, so the pre-amp is taking the audio signals from the radio component. how do i make the pre-amp take the signal from the said 3.5mm jack when i INSTANTLY plug in my phone?i'm getting my jack from here:http://www.digikey.com/product-search/en/connectors-interconnects/barrel-audio-connectors/1443095?k=3.5mm%20jackif i have stereo, do i choose a jack with an internal switch of DPST? coz i remember my high school electronics teacher showing me some sort of jack with a contact leaf that lifts when he plugs in a 3.5mm connector; back when he built an amplifier once. Quote Link to comment Share on other sites More sharing options...
Muhammad Abu Bakar Posted May 4, 2013 Report Share Posted May 4, 2013 You have a clever idea. I don't think it would be a pretty work. You need to trace the circuit where audio amplifier takes input. Then tap these wires out. No gaurantee that it will not damage the rf output. Quote Link to comment Share on other sites More sharing options...
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