Adding a AUX Jack to this 80's Delco AM/FM STEREO

[Fisher77]

Been searching around on the net to find directions to install a aux jack on this Delco 16009960 stereo. Have not found anything to help me out. Thought I would ask here to see if someone can enlighten me on how to accomplish this task. Thanks for any help.

[budm]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

Did you find the service manual for it? Otherwise you can try disconnecting the wire to the top end of the Volume control and feed the signal to top end of the pot it to see if it will have enough gain to accept low level audio signal or not.
Or trace out to see where top end of the pots go to.

[Fisher77]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

I have looked for a manual, but have not found one yet.


I found this picture of a wiring diagram on another forum for this exact model radio. The directions the person had said to remove the blue wire from the circuit board, attach to it the wire with a.01 cap, and then connect the other wire to the circuit board. I see a blue wire on the circuit board, but it is attached the the board on both ends of the wire. Which end should I disconnect, or does it matter?

And where should I connect the ground?

Thanks

[budm]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

I do not think that is correct, that is mono connection and the 0.01 uF will be too small of the value to get good low frequency, this is solid state and has low impedance compared to tube amplifier so the audio coupling cap will be much higher capacitance.
It is also not clear which blue wire the OP is talking about.
The Gnd can be the Grounded end of the Volume pots.

[Fisher77]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

Thanks budm, I will try hooking it at the location you suggested. I still have not found a service manual for it. I will keep digging.

[Fisher77]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

Budm here are some pics of the of both sides of the board with the pots on it. I believe its called the amp board(correct me if I am wrong on that). Don't know if they will help any or not.

[budm]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

https://www.badcaps.net/forum/attach...3&d=1474378179
That looks to be the AMAPLIFER board with the power amplifiers attached to the heatsink.
There are are 4 pots, so what are the left knobs for Volume, tone control, Balance? The right knob for the tuning only?

[Fisher77]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

https://www.badcaps.net/forum/attach...3&d=1474378179
That looks to be the AMAPLIFER board with the power amplifiers attached to the heatsink.
There are are 4 pots, so what are the left knobs for Volume, tone control, Balance? The right knob for the tuning only?

What you listed is all correct for the left knob, right knob is for tuning, and changing from right, and left speakers.

[budm]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

Then we need to find out which one is the Volume pots.

[budm]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

https://www.badcaps.net/forum/attach...0&d=1474378102
Can you move the wires out off the way so I can see the traces?
Also the pictures of the top side of the board.
I can see some labels on the board so that may help us figuring out the circuit.

[Fisher77]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

Here it is with the wires out of the way.

[budm]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

That is good pictures, now I need the component side.
So far it looks like the location to use for the Left and right channel inputs will be the two pads on the top right PADS with 'L' and 'R' labels.

[Fisher77]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

Thanks. I am impressed myself with the pics since it is a cell phone camera. Never thought the pics would be that good. Its a outdated Samsung galaxy S4 active. Older than the hills. I tested the posts with my multimeter, #1, and #2 in the stack are for tone and balance. The #3, and #4 are for volume.

Here is the component side.

[budm]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

1) Remove the RED (or may be orange, the color is not clear) wire from the 'L' pad and then solder the wire to pin 4 of the jack.
2) Remove the GREEN wire from the 'R' pad and then solder the wire to pin 3 of the jack.
3) Solder 10uf/25V cap with + leg to pin 5 of the lack, the - leg to the 'L' pad.
4) Solder 10uf/25V cap with + leg to pin 2 of the lack, the - leg to the 'r' pad.
5) Solder the GND wire to pin 1 of the jack and the end to the GND pad on the board marked with solid red circle as shown in the pictures.

[Fisher77]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

Will do. I will get back when I get it all done. Thanks budm.

[Fisher77]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

Budm you are the man! That did the trick. I really appreciate your help!!

I have another question about this radio. I noticed the the 2 rear speaker outputs are louder than the 2 front speaker outputs. I assume that the 2 rear ones are louder because they are amplified. Question is, should the 2 front speaker outputs be amplified as well?

[Th3_uN1Qu3]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

All the outputs are amplified. See if there is a "FADER" control on your radio.

[budm]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

All the outputs are amplified. See if there is a "FADER" control on your radio.

+1, there is Fader control, it should be on the same side where the Tuning knob is. It uses big wire wound type pot.

I still wonder who came up with this diagram.
https://www.badcaps.net/forum/attach...1&d=1474299090

[Fisher77]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

All the outputs are amplified. See if there is a "FADER" control on your radio.

That was it. Now why didnt I thing of that before asking, geeez

[budm]

Re: Adding a AUX Jack to this 80's Delco AM/FM STEREO

Glad to hear you got it working, that is due to your good clear pictures.