AUX input jack for 67-72 AM radio

[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

[slikside]

subscribed.

[Shevez Latreille]

Will it work with a broken radio ?

[GuyO]

Originally Posted by Shevez Latreille

Will it work with a broken radio ?

Yes, in fact that is why I did it - to keep the original look. My radio would light up but couldn't get a signal. Now I listen to the radio through Iheartradio on my phone through the aux jack.

[frankslagoon]

I did my 70 just like Blkcorvair said and it works great.

[lsversaw]

This is absolutely the cheapest/best way to connect any music player or phone to your audio system. The only shortcoming, if there is one, is that you'll hear mono, not stereo.

If your radio isn't working, you can just connect an aftermarket amplifier between your phone and original speaker. You can get a name-brand, highly-rated amp for under $100.

If you go the route of an aftermarket amp, you can also wire your original-radio on/off/volume control to manage on/off and volume through the amp.

I can add all sorts of features to original radios -- aux input, Bluetooth, USB, FM stereo, more power, pre-amp outputs -- but I realize that it's expensive compared to DIY options like the one descibed here, and not the best option for everyone.

[rockyrivermark]

Originally Posted by lsversaw

This is absolutely the cheapest/best way to connect any music player or phone to your audio system. The only shortcoming, if there is one, is that you'll hear mono, not stereo.

If your radio isn't working, you can just connect an aftermarket amplifier between your phone and original speaker. You can get a name-brand, highly-rated amp for under $100.

If you go the route of an aftermarket amp, you can also wire your original-radio on/off/volume control to manage on/off and volume through the amp.

I can add all sorts of features to original radios -- aux input, Bluetooth, USB, FM stereo, more power, pre-amp outputs -- but I realize that it's expensive compared to DIY options like the one descibed here, and not the best option for everyone.

Posted via Mobile Device

[rockyrivermark]

if I get the 2k resistor what wattage should be used?
They vary and I didn't see it mentioned
Thanks.
Posted via Mobile Device

[notchbackgta]

1/4 watt should be fine for this, but you could do a 1/2

[69Tom]

Seeing as photobucket sucks does anyone have any diagrams or photos of this being done? Thanks.

[PAWS 72]

Originally Posted by 69Tom

Seeing as photobucket sucks does anyone have any diagrams or photos of this being done? Thanks.

Go to the very first post. All the photos are still there as of now.

[PAWS 72]

For a few that wonders. Just resurrecting from the dead. Nearly a year later.

[FL71C10]

Has anyone had any problem with the "noisy" sound after a while from corrosion of contacts with this mod? I asked my engineer friend if he could help me with this, but he is concerned that is the contacts corrode the sound would get noisy. He said something about it being a very low powered circuit,and that any corrosion might negatively affect the sound quality.

Any thought?

Thanks.
John

[FL71C10]

No comments or suggestions?