Haha, ya, I guess the mirror does look pretty nostalgic. Awesome!
You made the radio-job look very easy! Care to explain how to hooked up your Ipod?
I'm thinking of trying this with an old Philips AM Stereo radio in my old Mercedes!
I'd appreciate the help.
You're doing an amazing job on this car. This is a seriously interesting rebuild! Keep it up, your enthusiasm has inspired me!
Thank you so much for the comment!
In that setup it was pretty easy. Coming out of a headphones wire, there are four wires, two per channel. I twisted the two black wires (the ground from each channel) together and soldered them into the common ground on the stereo (the case pretty much). I then took the two remaining wires and twisted them together (effectively taking them from stereo to mono) then I soldered them into the input of the volume potentiometer. On my potentiometer it ended up being the terminal closest to the center of the radio. And that was it!
However, I changed it up a bit. I was reading quite a bit about going from stereo to mono and apparently twisting the two wires together without any form of protection has the potential to harm the iPod. So I decided to wire in 1k ohms worth of resistance on each channel before twisting them together. This provides some safety for the iPod and has no real negative effect on sound quality.
Unfortunately, I'm lazy and the closest electronics shop that would sell resistors is about a 40 minute subway ride away. So, instead I drove down to the local HardOff (a second hand shop pretty close to here that has tons of old electronics) and picked up an old VHS camcorder (that weighed about a ton) for less than 3 dollars. I cracked it open and pilfered four 500 ohm resistors from it.
Here are two 500 ohm resistors in series and soldered to wire from one of the channels.
Both right and left channels with the resistors soldered on.
I then soldered two wires to the end of each resistor series and then twisted those two wires together and soldered them into the same input on the potentiometer.
If you look closely the potentiometer is just under the light. The potentiometer has six terminals actually (a volume potentiometer and a tone potentiometer). The terminal I soldered to would be the bottom left terminal in this picture.
This got me my audio back nice and safe. Then I wanted a way to charge the iPod while it's connected. It turns out that the iPod just uses standard USB voltage to charge with, so I went to the local Kojima and bought a cell phone cigarette lighter to USB charger and a wall charger for an iPod.
I cracked open the 12V to USB adapter and tried to figure out what I was up against.
I pulled out my multi meter, hooked up 12V to the cigarette lighter portion and found the pin on the USB terminal that gets the 5V. I then de-soldered the spring and weird side pins (which pull the positive and negative voltage from the cigarette lighter). The weird side pins also work as a jumper to connect a common ground on the right side of the board with the left side of the board. So I soldered a jumper wire in its place. I then flipped the board over and soldered on the 12V battery inputs to the same places the spring and side clip was soldered to. Then I found that the pin that gets the 5V shares a common line with a resistor and capacitor (that being where it gets it's 5V from). So I cut open the wall charger line and pulled the two wires out from the inside of that and soldered the positive into the resistor on the 5V side and the negative into the common ground on the opposite side of where I soldered the battery negative input (the jumper wire on the top side connects these two grounds)..
So that's all there was to it!
Here she is sitting on my desk rockin' out!
A close up. Interestingly enough if the charge cord isn't plugged into the iPod I get an insane amount of interference. It stops as soon as it's plugged in though, so not sure what's causing it.
And just for fun I took a short video! You can hear the kind of scratchy sound that the radio puts out, but I think it sounds pretty good for being more than 40 years old!
Thanks for the comments all!