The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Electrical > Truck Audio

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 07-12-2014, 12:12 PM   #51
69-72
Registered User
 
69-72's Avatar
 
Join Date: May 2008
Location: 204
Posts: 903
Re: AUX input jack for 67-72 AM radio

Quote:
Originally Posted by BBrendal View Post
Sweet!
Quote:
Originally Posted by chuck69ss View Post
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
__________________
1969 Chevy Custom Camper 3/4 ton Rust free survivor

1972 Chevy Blazer CST 4x4 Almost Rust free survivor

1972 GMC Jimmy 2wd Undergoing surgery

Last edited by 69-72; 07-12-2014 at 12:25 PM.
69-72 is offline   Reply With Quote
Old 12-08-2015, 04:30 PM   #52
mikey2409
Registered User
 
Join Date: Dec 2012
Location: Bell Gardens Ca
Posts: 151
Re: AUX input jack for 67-72 AM radio

Ok so I'm about to go to cell phone shack I mean radio shack to see if they believe in diodes resistors and all that fun electrical stuff still but before I leave I've read that the aux jack with 3 inputs works best and not the 5 and does it matter if it's stereo or mono and if I'm correct all I need is the 3 inputs cause all I'm doing adding a power signal and ground to the aux jack of so whiche wires should I be adding to or taking from since I'm more than likely going to running the out of the radio into the ash tray for a confined look
mikey2409 is offline   Reply With Quote
Old 12-08-2015, 07:18 PM   #53
frankslagoon
Registered User
 
Join Date: Jan 2014
Location: Wasilla Alaska
Posts: 537
Re: AUX input jack for 67-72 AM radio

I did my 70 just like Blkcorvair said and it works great.
frankslagoon is offline   Reply With Quote
Old 12-22-2015, 04:01 AM   #54
PAWS 72
Registered User
 
PAWS 72's Avatar
 
Join Date: Nov 2011
Location: Sheffield, ALA
Posts: 2,471
Re: AUX input jack for 67-72 AM radio

Quote:
Originally Posted by mikey2409 View Post
Ok so I'm about to go to cell phone shack I mean radio shack to see if they believe in diodes resistors and all that fun electrical stuff still but before I leave I've read that the aux jack with 3 inputs works best and not the 5 and does it matter if it's stereo or mono and if I'm correct all I need is the 3 inputs cause all I'm doing adding a power signal and ground to the aux jack of so whiche wires should I be adding to or taking from since I'm more than likely going to running the out of the radio into the ash tray for a confined look
Get the 5 wire and follow the directions and everything will work.3 is not cheaper than the 5 pin. As far as I know the mod I done is still working. I divorced 2 years ago and the son got the truck . It was his mom's dad truck.
PAWS 72 is offline   Reply With Quote
Old 02-06-2016, 09:53 PM   #55
ext5060
Registered User
 
Join Date: Oct 2011
Location: Damon, Tx
Posts: 8
Re: AUX input jack for 67-72 AM radio

Holy smokes.. That was a great info thread. Wish I had the nerve to try that!
ext5060 is offline   Reply With Quote
Old 02-06-2016, 09:55 PM   #56
69-72
Registered User
 
69-72's Avatar
 
Join Date: May 2008
Location: 204
Posts: 903
Re: AUX input jack for 67-72 AM radio

I had my am/fm converted to an aux input recently so it is possible.
__________________
1969 Chevy Custom Camper 3/4 ton Rust free survivor

1972 Chevy Blazer CST 4x4 Almost Rust free survivor

1972 GMC Jimmy 2wd Undergoing surgery
69-72 is offline   Reply With Quote
Old 02-08-2016, 10:11 AM   #57
serge
Registered User
 
serge's Avatar
 
Join Date: Oct 2012
Location: Geneva, Ohio
Posts: 201
Re: AUX input jack for 67-72 AM radio

Blkcorvair,
This is perfect. Hope to install this week. Will post results.
Thanks
__________________
General Contrucktor
serge is offline   Reply With Quote
Old 02-09-2016, 04:52 PM   #58
serge
Registered User
 
serge's Avatar
 
Join Date: Oct 2012
Location: Geneva, Ohio
Posts: 201
Re: AUX input jack for 67-72 AM radio

blkcorvair,
Followed your directions and it works great.
Last year I installed stock AM radio (with a speaker from Turnswitch) but used it very little due to poor reception. Now with this AUX jack set-up I get to enjoy the great sound the speaker puts out and maintain stock look.
Thanks for the post.
Serge
P.S. The only thing that is a little discouraging is the loose connection when patch cord is plugged in jack. Got them from radio shack.
__________________
General Contrucktor
serge is offline   Reply With Quote
Old 08-22-2016, 08:49 AM   #59
serge
Registered User
 
serge's Avatar
 
Join Date: Oct 2012
Location: Geneva, Ohio
Posts: 201
Re: AUX input jack for 67-72 AM radio

6 month update.
This set-up is still working great. I use it with my MP3 player all the time.
By far the best 5 dollars I have spent on this truck.
Thanks again Blkcorvair.
__________________
General Contrucktor
serge is offline   Reply With Quote
Old 03-26-2017, 08:06 PM   #60
rockyrivermark
Registered User
 
Join Date: Apr 2011
Location: Fairview Park, Ohio
Posts: 1,027
Just did this to mine old am today
So cool!
Thanks.
Posted via Mobile Device
rockyrivermark is offline   Reply With Quote
Old 03-29-2017, 03:44 PM   #61
lsversaw
Registered User
 
lsversaw's Avatar
 
Join Date: Aug 2013
Location: McPherson, KS
Posts: 86
Re: AUX input jack for 67-72 AM radio

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.
__________________
Scott
1972 C20 long-wide. 350/350, Cheyenne Super, wood bed, PS, PB, dual batteries, dual tanks, leaf springs, gauges. No significant rust. No significant paint.
1971 C10 short step. Originally a 250/3ott with no options, now a 350/4L80. I purchased it already restored; only needs about 300 little details fixed.
lsversaw is offline   Reply With Quote
Old 03-31-2017, 07:22 PM   #62
rockyrivermark
Registered User
 
Join Date: Apr 2011
Location: Fairview Park, Ohio
Posts: 1,027
Quote:
Originally Posted by lsversaw View Post
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 is offline   Reply With Quote
Old 03-31-2017, 07:23 PM   #63
rockyrivermark
Registered User
 
Join Date: Apr 2011
Location: Fairview Park, Ohio
Posts: 1,027
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
rockyrivermark is offline   Reply With Quote
Old 04-01-2017, 09:14 PM   #64
notchbackgta
Registered User
 
Join Date: Dec 2011
Location: Earth, NJ
Posts: 479
Re: AUX input jack for 67-72 AM radio

1/4 watt should be fine for this, but you could do a 1/2
notchbackgta is offline   Reply With Quote
Old 03-11-2018, 08:21 PM   #65
69Tom
Senior Member
 
69Tom's Avatar
 
Join Date: Jul 2015
Location: Phoenix, AZ
Posts: 1,331
Re: AUX input jack for 67-72 AM radio

Seeing as photobucket sucks does anyone have any diagrams or photos of this being done? Thanks.
69Tom is offline   Reply With Quote
Old 03-30-2019, 02:26 PM   #66
PAWS 72
Registered User
 
PAWS 72's Avatar
 
Join Date: Nov 2011
Location: Sheffield, ALA
Posts: 2,471
Re: AUX input jack for 67-72 AM radio

Quote:
Originally Posted by 69Tom View Post
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 is offline   Reply With Quote
Old 03-17-2020, 01:17 AM   #67
PAWS 72
Registered User
 
PAWS 72's Avatar
 
Join Date: Nov 2011
Location: Sheffield, ALA
Posts: 2,471
Re: AUX input jack for 67-72 AM radio

For a few that wonders. Just resurrecting from the dead. Nearly a year later.
PAWS 72 is offline   Reply With Quote
Old 05-30-2020, 12:30 PM   #68
FL71C10
Registered User
 
Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,503
Re: AUX input jack for 67-72 AM radio

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
__________________
71 Chevy C10 Shortbed Stepside. LT1 with
4l60E. Just got back from painter, in assembly now.
FL71C10 is offline   Reply With Quote
Old 06-11-2020, 11:27 PM   #69
FL71C10
Registered User
 
Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,503
Re: AUX input jack for 67-72 AM radio

No comments or suggestions?
__________________
71 Chevy C10 Shortbed Stepside. LT1 with
4l60E. Just got back from painter, in assembly now.
FL71C10 is offline   Reply With Quote
Old 03-16-2021, 10:09 AM   #70
Kidd-7
Registered User
 
Kidd-7's Avatar
 
Join Date: Aug 2010
Location: RTP, NC
Posts: 518
Re: AUX input jack for 67-72 AM radio

I do agree being a low power circuit it will be more susceptible to noise induced from corrosion. The resistance created by any corrosion would not have to be very high to have a significant impact on the audio, again because of the audio signal being low. I can not speak to this in practice though.
__________________

71 C-10 - 307 - 3 on tree
01 Ford Explorer 5.0 v8
96 Mercury Cougar v8
79 Trans Am 403 Olds
Kidd-7 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 05:15 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com