Here s the goal ..
Using a modern mp3 player on a vintage radio without paying 100 $ .
We can for 5 $ , in fact 2 $ if you get a free box for this , a soldering iron and a few wires . Notice the commercial
adaptor also need soldering , if they are not FM transmitters . What if you just have mono AM ? :P
If you have to fix something , you d better know how it works ...
So a few basics : It s really basic knowledge , easy to understand for people not familar with electronics , so be indulgents if I explain it quite easily ...
Any car radio , home amplifier or whatever basicelly works the same way . You need a source , to provide a low signal from CD player , radio, 8 track tape or whatever .
Then , you need a power stage , to move the loudspeakers . It s the amplifier .
Mostly all radios have an ampli inside . Not always really powerfull , but there s an amplifier . Usually between 4 or 11 watt in an old stock radio .
Between the source and the amplifier , there s a way to choose how much output ( sound ) you want from the radio . It s the volume button .
This is were we can play ....
A volume button works quite like a rheostat , the same we have to have more or less light in the dash .
The source comes from the top , and bellow is the ground . The middle cursor move between both and is connected to the amplifier .
The shape is just round :P
So if you turn left , you move the cursor to the ground , less sound , if you turn right , you go to full source and have more sound .
Just as easy ....
So ... What now ? Instead of sending to the amplifier the sound comng from the radio, we can send the sound from
The ugly way would be to cut the wires coming from the source , and solder wires connected to a mp3 player .
For just 2 $ more , we ll give the beast 2 lifes .
Remember the FM receiver you had . Usually the sound comes from the loudspeakers , but when we plug ears , the speakers
stop and there s sound only in the ears .
It s just a mecanical connector . That s what we have to use .
Go to any electronics store parts , and ask for a stereo jack connector ( 1/8 I think ), with a mecanical switch , to choose from head / speakers .
Cut wire on the volume button , inside the radio ,
Test it with your favorite Beckman , Fluke , ohmetre , solder it so that without anything plugged inside the sound comes from the radio , and when you plug a mp3 player , the sound comes from it . It s stupid and easy but it s enough .
In french , but quite easy to understand :
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I have wondered if there was an easy way to do this for years. I think I still have my old 1961 Buick AM Radio in the Garage... from my first Car:) A 1961 Buick Invicta, with a Big Block "445 Wild Cat" Motor. It would do 110 mph all the way to Town!;) Kind of wish I still had her;) But, I got hit crossing the Highway one day. And couldn't find a driver side door, even back in 1973 or 4! For some reason, I saved the Radio though. If I remember right, it sounded better than the on in the 1964 Chevelle, that I got to replace the Buick. Must be why I saved it... Anyway, in the 90's, I had a 1954 Chevy Blair. And I wanted to Add an Aux Audio Input to the Factory Radio (which actually didn't work). But even then, info like this was hard to find. I sold my Blair about 5 years ago and never got the Radio Working:( I'm glad to find this info now, though. Ya, just never know, when you might need to know;)...