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Michaël Duerinckx

 

Posts Tagged ‘Audio’

Adding stereo VU meters to a turntable

My fiancĂ©e got me a great gift for my last birthday: a turntable. Being a classic trance lover, I’ve since been collecting a bunch of records. The thing has really been a source of joy thus far.

About a month ago I started itching to do a little electronics project again as it had been a while. Long story short, I figured it’d be neat to open up this relatively simple device and add a nice aesthetic feature to it: VU meters.

Since this is a rather involved hack, (as opposed to my line-in addition to a boombox), it gave me a good reason to finally check out Southampton’s maker/hackerspace, SoMakeIt.

Turntable with lit LEDs along the diameter of the record it's playing

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Hacking a line-in socket into an 80s radio and cassette player

A few years ago, my grandmother gave me one of the old radios she had lying around the house. My late grandfather’s hobby was participating in radio quizzes, which led him to win a lot of radios; I assume this was one of them. The radio was manufactured in the early 80s, so the guts are relatively easy to tinker with; everything is on single-layer PCBs.

Frontal photo of the radio before any alterations were made, showing buttons on top, speakers on either side of a cassette deck, slider buttons, a radio tuning dial across the top, and sound volume indicator lights
The radio, as it looked before opening it up

I realised that the audio quality of this old boy was really decent, so it would be a waste to just let it sit in a cupboard. I don’t generally listen to the radio that much, and I don’t exactly have a big collection of music on cassettes either (and if I did, I’d digitize it anyway). To really get some use out of it, the most logical thing would be to have a line-in, letting me hook up a phone or whichever external audio source.

So, I set to work, opening the machine up.

Photo of the radio laying down on its back, the front part of the case taken off. Revealed is the mechanism of the cassette player, various sliders, PCBs with various components on the left and right, and the transformer on the far left.
The front part of the case taken off, which removes the speakers

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