AUX input jack for 67-72 AM radio

[chuck69ss]

Couple of thoughts:
1. A cap soldered to the case sounds like a tone control, rather than volume. These are stacked pots, right?
2. The easiest way to figure this out is with an oscilloscope. I have also used a set of headphones with one side tied to gnd and uses the signal lead to poke around and follow the signal path. You want to find the input side of the volume control.
3. I wish that had an AM/FM to figure this out. :-)

Maybe someone else has figured this out.

[69-72]

Originally Posted by chuck69ss

Couple of thoughts:
1. A cap soldered to the case sounds like a tone control, rather than volume. These are stacked pots, right?
2. The easiest way to figure this out is with an oscilloscope. I have also used a set of headphones with one side tied to gnd and uses the signal lead to poke around and follow the signal path. You want to find the input side of the volume control.
3. I wish that had an AM/FM to figure this out. :-)

Maybe someone else has figured this out.

Thanks for the insight. Not quite sure what the significance stacked pots have but it does look like there is two of them kind of. I will try the headphone idea and report back.

[Greenlee]

I just bought a neat device that adds Bluetooth to an aux input. It works great with no loss in sound quality. I leave mine plugged in all the time and never have to touch it. I bought this because I listen to music through my iphone. The phone has a water proof case and it was a pain to plug into the aux jack.

Seems like you guys adding the plug to the stock radio could add one to the back of the radio somewhere. Then you could hide the Bluetooth adapter and your system would be completely wireless. People would be wondering what AM radio station you are listening to with all the cool music and no commercials.

Here's a link to the one I bought.

Amazon.com: Rockford Fosgate Universal Bluetooth...

[69-72]

My plan is to add Bluetooth. I bought one of these http://www.ebay.com/itm/141283435836?redirect=mobile and one of these to power it http://www.ebay.com/itm/UN3F-Car-Cha...item43bdb9b07c

I will be able to tuck all this up under the dash to have an invisible Bluetooth system.

I already did the aux mod to an am radio and have the cord coming about of the dash is a bit of a pain so the Bluetooth should clean things up nicely.

[69-72]

Originally Posted by BBrendal

Sweet!

Originally Posted by chuck69ss

Couple of thoughts:
1. A cap soldered to the case sounds like a tone control, rather than volume. These are stacked pots, right?
2. The easiest way to figure this out is with an oscilloscope. I have also used a set of headphones with one side tied to gnd and uses the signal lead to poke around and follow the signal path. You want to find the input side of the volume control.
3. I wish that had an AM/FM to figure this out. :-)

Maybe someone else has figured this out.

So I did the headphone thing. I found sound when I probed the blue wires on the circuit board, only problem is afterwards when I hook up my aux source to them it does go through but is very faint. There are also two different points on the board that the blues go to, one of them has two blues going to it, only one of them the source is heard over, the other point also plays the source when it is applied.



Edit: I discovered that when the source is hooked up to the blue wires it is not being amplified, volume stays at same level when power is removed from radio