Wiring stereo jack directly to IC?

E

Eli Luong

Guest
I have an old stereo system that I'd like to keep using and I'd like
to try to add a line-in jack for plugging in an MP3 player or
connecting audio from a computer. I found the service repair manual,
and it looks like the cassette, tuner, and CD all go to this one IC -
LC75392 (http://datasheetcatalog.com/datasheets_pdf/L/C/7/5/
LC75392.shtml). Can I just solder leads from a stereo jack to the
appropriate pins onto the IC, and the ground to the ground?

- Eli
 
On Sat, 9 Jan 2010 17:00:31 -0800 (PST), Eli Luong
<eliluong@gmail.com> wrote:

I have an old stereo system that I'd like to keep using and I'd like
to try to add a line-in jack for plugging in an MP3 player or
connecting audio from a computer. I found the service repair manual,
and it looks like the cassette, tuner, and CD all go to this one IC -
LC75392 (http://datasheetcatalog.com/datasheets_pdf/L/C/7/5/LC75392.shtml).
Can I just solder leads from a stereo jack to the
appropriate pins onto the IC, and the ground to the ground?
Click to expand...
I don't know the elctronics, but I'd solder to the copper trace fairly
far from the IC to avoid overheating the IC. The original soldering
was done by a machine, or a guy who did it all day and got very good
at it.

(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time. They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into. They'd been working on this
for months or more, plus the three months I was there. I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?

Thanks.

>- Eli
 
On 1/9/2010 5:38 PM mm spake thus:

(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time. They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into. They'd been working on this
for months or more, plus the three months I was there. I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?
Click to expand...
Dunno when it was perfected, but I believe you're referring to what's
called "wave soldering".


--
You were wrong, and I'm man enough to admit it.

- a Usenet "apology"
 
mm wrote:
On Sat, 9 Jan 2010 17:00:31 -0800 (PST), Eli Luong
eliluong@gmail.com> wrote:

I have an old stereo system that I'd like to keep using and I'd like
to try to add a line-in jack for plugging in an MP3 player or
connecting audio from a computer. I found the service repair manual,
and it looks like the cassette, tuner, and CD all go to this one IC -
LC75392 (http://datasheetcatalog.com/datasheets_pdf/L/C/7/5/LC75392.shtml).
Can I just solder leads from a stereo jack to the
appropriate pins onto the IC, and the ground to the ground?

I don't know the elctronics, but I'd solder to the copper trace fairly
far from the IC to avoid overheating the IC. The original soldering
was done by a machine, or a guy who did it all day and got very good
at it.

(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time. They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into. They'd been working on this
for months or more, plus the three months I was there. I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?

Thanks.

- Eli

Wave-soldering. Been used for quite a few years now.
Click to expand...
 
On Sat, 9 Jan 2010 21:59:22 -0800 (PST), stratus46@yahoo.com wrote:

On Jan 9, 5:38 pm, mm <NOPSAMmm2...@bigfoot.com> wrote:
On Sat, 9 Jan 2010 17:00:31 -0800 (PST), Eli Luong

elilu...@gmail.com> wrote:
I have an old stereo system that I'd like to keep using and I'd like
to try to add a line-in jack for plugging in an MP3 player or
connecting audio from a computer. I found the service repair manual,
and it looks like the cassette, tuner, and CD all go to this one IC -
LC75392 (http://datasheetcatalog.com/datasheets_pdf/L/C/7/5/LC75392.shtml).
Can I just solder leads from a stereo jack to the
appropriate pins onto the IC, and the ground to the ground?

I don't know the elctronics, but I'd solder to the copper trace
fairly
far from the IC to avoid overheating the IC.  The original
soldering
was done by a machine, or a guy who did it all day and got very
good
at it.

(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time.  They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into.  They'd been working on this
for months or more, plus the three months I was there.  I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?

Thanks.


- Eli


It's actually pretty hard to ruin an IC with a soldering iron - unless
it's a Bernz-O-Matic.
Click to expand...
I'm a marine. The difficult we do immediately. The impossible takes
a little longer.

>G˛
 
On Jan 9, 5:00 pm, Eli Luong <elilu...@gmail.com> wrote:
I have an old stereo system that I'd like to keep using and I'd like
to try to add a line-in jack for plugging in an MP3 player or
connecting audio from a computer. I found the service repair manual,
and it looks like the cassette, tuner, and CD all go to this one IC -
LC75392 (http://datasheetcatalog.com/datasheets_pdf/L/C/7/5/
LC75392.shtml). Can I just solder leads from a stereo jack to the
appropriate pins onto the IC, and the ground to the ground?

- Eli
Click to expand...
OK, that's fine but how do you control the chip to select the new
input? Or are you giving up one of the existing inputs?

G˛
 
On Jan 9, 5:38 pm, mm <NOPSAMmm2...@bigfoot.com> wrote:
On Sat, 9 Jan 2010 17:00:31 -0800 (PST), Eli Luong

elilu...@gmail.com> wrote:
I have an old stereo system that I'd like to keep using and I'd like
to try to add a line-in jack for plugging in an MP3 player or
connecting audio from a computer. I found the service repair manual,
and it looks like the cassette, tuner, and CD all go to this one IC -
LC75392 (http://datasheetcatalog.com/datasheets_pdf/L/C/7/5/LC75392.shtml).
Can I just solder leads from a stereo jack to the
appropriate pins onto the IC, and the ground to the ground?

I don't know the elctronics, but I'd solder to the copper trace
fairly
far from the IC to avoid overheating the IC.  The original
soldering
was done by a machine, or a guy who did it all day and got very
good
at it.

(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time.  They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into.  They'd been working on this
for months or more, plus the three months I was there.  I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?

Thanks.


- Eli
Click to expand...

It's actually pretty hard to ruin an IC with a soldering iron - unless
it's a Bernz-O-Matic.

G˛
 
On Jan 9, 9:57 pm, stratu...@yahoo.com wrote:
On Jan 9, 5:00 pm, Eli Luong <elilu...@gmail.com> wrote:

I have an old stereo system that I'd like to keep using and I'd like
to try to add a line-in jack for plugging in an MP3 player or
connecting audio from a computer. I found the service repair manual,
and it looks like the cassette, tuner, and CD all go to this one IC -
LC75392 (http://datasheetcatalog.com/datasheets_pdf/L/C/7/5/
LC75392.shtml). Can I just solder leads from a stereo jack to the
appropriate pins onto the IC, and the ground to the ground?

- Eli

OK, that's fine but how do you control the chip to select the new
input? Or are you giving up one of the existing inputs?

G˛
Click to expand...
I was thinking why can't I just piggyback on one of the inputs. eg if
I connect it to the cassette tape input, then I won't use the tape and
the aux input at the same time?
 
On Jan 9, 9:57 pm, stratu...@yahoo.com wrote:
On Jan 9, 5:00 pm, Eli Luong <elilu...@gmail.com> wrote:

I have an old stereo system that I'd like to keep using and I'd like
to try to add a line-in jack for plugging in an MP3 player or
connecting audio from a computer. I found the service repair manual,
and it looks like the cassette, tuner, and CD all go to this one IC -
LC75392 (http://datasheetcatalog.com/datasheets_pdf/L/C/7/5/
LC75392.shtml). Can I just solder leads from a stereo jack to the
appropriate pins onto the IC, and the ground to the ground?

- Eli

OK, that's fine but how do you control the chip to select the new
input? Or are you giving up one of the existing inputs?

G˛
Click to expand...
I found that each cassette player connects to a 3-pin or 6-pin
(recording side) plug, similar to a 3-pin CPU fan socket. So I'm going
to take the 3-pin and see if I can wire it to a 1/8" stereo jack.
 
In article <afbik51666ll913td721atop30jggrcb9s@4ax.com>,
mm <NOPSAMmm2005@bigfoot.com> wrote:

(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time. They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into. They'd been working on this
for months or more, plus the three months I was there. I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?
Click to expand...
This is how Kriesler Australia soldered components to PCBs for their
transister radios around 1960 - 64.

The PCBs were on a sort of travelling frame which first took the board
over a rosin spray then into the solder bath - the height was such that
only the lower (etched) side of the board dipped into the molten solder.

After the solder bath the board went to a production line where first it
was checked for dry joints, then aligned and tested for function.

It was a proven process with thousand of sets made this way

If only the Navy had thought to ask any of the radio set mfgs they could
have saved themselves a lot of work, as I presume it wasn't only
Kriesler that used this method.

David
 
On Sun, 10 Jan 2010 22:39:01 GMT, David
<postings@REMOVE-TO-REPLYconfidential-counselling.com> wrote:

In article <afbik51666ll913td721atop30jggrcb9s@4ax.com>,
mm <NOPSAMmm2005@bigfoot.com> wrote:


(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time. They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into. They'd been working on this
for months or more, plus the three months I was there. I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?

This is how Kriesler Australia soldered components to PCBs for their
transister radios around 1960 - 64.

The PCBs were on a sort of travelling frame which first took the board
over a rosin spray then into the solder bath - the height was such that
only the lower (etched) side of the board dipped into the molten solder.
Click to expand...
Yes, exactly.

After the solder bath the board went to a production line where first it
was checked for dry joints, then aligned and tested for function.

It was a proven process with thousand of sets made this way

If only the Navy had thought to ask any of the radio set mfgs they could
have saved themselves a lot of work, as I presume it wasn't only
Kriesler that used this method.
Click to expand...
I know it's popular to bash anything related to the government, but I
don't believe the Navy was't aware of what private industry had done.

I suspect they were looking for higher reliability or something.

If your transistor radio breaks, you do without it for a day until you
can get another one.

If your Walleye** missile breaks, you've wasted an entire expensive
missile, and allowed the enemy to escape and do whatever harm they had
planned to do. Plus a portion of everything it took to get the
plane to the battle-area.

**The were also working on the Wall-eye (sp?) air-to-land missile in
1965, with a camera on gimbals in the nose of the missile, with which
the pilot could aim the missile and it, with his help I think, could
keep the camera aimed at the target, and the missile brain would make
sure the missile was also heading for the target. When fully
operational, itt was supposed to be able to enter a doorway. In Viet
Nam I guess. I don't know if it ever worked then, but it was part of
the development of the missiles we saw in the first Gulf War in 1990.
I wish I knew the details of those 25 years.

Well, here's a little bit about it:
http://en.wikipedia.org/wiki/Walleye_missile
And it looks like the Walleye II is still operational;
http://en.wikipedia.org/wiki/File:A-6E_Intruder_releasing_a_Walleye_II.jpg

>David
 
On Sun, 10 Jan 2010 22:39:01 GMT, David
<postings@REMOVE-TO-REPLYconfidential-counselling.com> wrote:

In article <afbik51666ll913td721atop30jggrcb9s@4ax.com>,
mm <NOPSAMmm2005@bigfoot.com> wrote:


(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time. They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into. They'd been working on this
for months or more, plus the three months I was there. I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?

This is how Kriesler Australia soldered components to PCBs for their
transister radios around 1960 - 64.
Click to expand...
Oh, thanks for telling me about this, and everything that follows
(except the last sentence. :) ).

The PCBs were on a sort of travelling frame which first took the board
over a rosin spray then into the solder bath - the height was such that
only the lower (etched) side of the board dipped into the molten solder.

After the solder bath the board went to a production line where first it
was checked for dry joints, then aligned and tested for function.

It was a proven process with thousand of sets made this way

If only the Navy had thought to ask any of the radio set mfgs they could
have saved themselves a lot of work, as I presume it wasn't only
Kriesler that used this method.

David
Click to expand...
 
On Jan 10, 2:39 pm, David <posti...@REMOVE-TO-REPLYconfidential-
counselling.com> wrote:
In article <afbik51666ll913td721atop30jggrc...@4ax.com>,

 mm <NOPSAMmm2...@bigfoot.com> wrote:

(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time.  They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into.  They'd been working on this
for months or more, plus the three months I was there.  I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?

This is how Kriesler Australia soldered components to PCBs for their
transister radios around 1960 - 64.

The PCBs were on a sort of travelling frame which first took the board
over a rosin spray then into the solder bath - the height was such that
only the lower (etched) side of the board dipped into the molten solder.

After the solder bath the board went to a production line where first it
was checked for dry joints, then aligned and tested for function.

It was a proven process with thousand of sets made this way

If only the Navy had thought to ask any of the radio set mfgs they could
have saved themselves a lot of work, as I presume it wasn't only
Kriesler that used this method.

David
Click to expand...
Thanks for the history lesson. I worked on wave solder, "and smt"
machines for years. Never really knew the history. The wave systems
stilll run pretty much exactly the same way, less some preheats, and
nitrogen gas here and there. I always thought it was neat that if you
dropped your wrench in the solder bath, it would float on top. Loved
those things.
------------------
 
David wrote:
In article <afbik51666ll913td721atop30jggrcb9s@4ax.com>,
mm <NOPSAMmm2005@bigfoot.com> wrote:


(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time. They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into. They'd been working on this
for months or more, plus the three months I was there. I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?

This is how Kriesler Australia soldered components to PCBs for their
transister radios around 1960 - 64.

The PCBs were on a sort of travelling frame which first took the board
over a rosin spray then into the solder bath - the height was such that
only the lower (etched) side of the board dipped into the molten solder.

After the solder bath the board went to a production line where first it
was checked for dry joints, then aligned and tested for function.

It was a proven process with thousand of sets made this way

If only the Navy had thought to ask any of the radio set mfgs they could
have saved themselves a lot of work, as I presume it wasn't only
Kriesler that used this method.
Click to expand...

Were any of those 'radio set mfgs' certified for 'mil spec'
soldering? It's one thing to splash solder on a cheap paper based,
consumer grade PC board and quite another to have it pass inspection for
military applications.


--
Greed is the root of all eBay.
 
Sansui Samari wrote:
Thanks for the history lesson. I worked on wave solder, "and smt"
machines for years. Never really knew the history. The wave systems
stilll run pretty much exactly the same way, less some preheats, and
nitrogen gas here and there. I always thought it was neat that if you
dropped your wrench in the solder bath, it would float on top. Loved
those things.
Click to expand...

The last reflow oven I used was a Heller, about eight years ago. We
were building 17 layer VME instrumentation boards and some smaller six
to eight layer boards.


--
Greed is the root of all eBay.
 
In article <jdKdnQrYYecIFtbWnZ2dnUVZ_txi4p2d@earthlink.com>,
"Michael A. Terrell" <mike.terrell@earthlink.net> wrote:

David wrote:

In article <afbik51666ll913td721atop30jggrcb9s@4ax.com>,
mm <NOPSAMmm2005@bigfoot.com> wrote:


(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time. They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into. They'd been working on this
for months or more, plus the three months I was there. I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?

This is how Kriesler Australia soldered components to PCBs for their
transister radios around 1960 - 64.

The PCBs were on a sort of travelling frame which first took the board
over a rosin spray then into the solder bath - the height was such that
only the lower (etched) side of the board dipped into the molten solder.

After the solder bath the board went to a production line where first it
was checked for dry joints, then aligned and tested for function.

It was a proven process with thousand of sets made this way

If only the Navy had thought to ask any of the radio set mfgs they could
have saved themselves a lot of work, as I presume it wasn't only
Kriesler that used this method.


Were any of those 'radio set mfgs' certified for 'mil spec'
soldering? It's one thing to splash solder on a cheap paper based,
consumer grade PC board and quite another to have it pass inspection for
military applications.
Click to expand...
No as far as I know they were only for commercial distribution - eg for
people who wanted a quality transistor radio.

But it wasn't about 'splashing..' it was dipping and then the board was
run by inspectors who then hand soldered any joints that even looked
suspect.

My job at the time was final testing and faulty part replacement of the
completed boards before they were mounted into their case. Though for a
few days I was one of the dry joint inspectors.

As far as I can remember there were very few faults due to dry joints by
the time the sets came to me.

But I know nothing about military specs etc so... But on a TV show last
night they mentioned that the rockets with the space program would have
up to 60,000 faults in a rocket I guess their specs were either not up
to military standard or the military needs to do some quality control ed.

David

David
 
David wrote:
In article <jdKdnQrYYecIFtbWnZ2dnUVZ_txi4p2d@earthlink.com>,
"Michael A. Terrell" <mike.terrell@earthlink.net> wrote:

David wrote:

In article <afbik51666ll913td721atop30jggrcb9s@4ax.com>,
mm <NOPSAMmm2005@bigfoot.com> wrote:


(When I was a summer employee of the US Naval Avionics facility in
Indianapolis in 1965, they were working on a way to solder all the
connections on a circuit board at one time. They had a couple
"machines" each with river of solder a foot wide that they would
barely dip the whole circuit board into. They'd been working on this
for months or more, plus the three months I was there. I walked by
every day but didn't work in that department. I think my boss said it
was hard to keep the surface of river flat.

Who did figure out how to do this, and do any of you know when it
happened?

Do any of you know what the process is called?

This is how Kriesler Australia soldered components to PCBs for their
transister radios around 1960 - 64.

The PCBs were on a sort of travelling frame which first took the board
over a rosin spray then into the solder bath - the height was such that
only the lower (etched) side of the board dipped into the molten solder.

After the solder bath the board went to a production line where first it
was checked for dry joints, then aligned and tested for function.

It was a proven process with thousand of sets made this way

If only the Navy had thought to ask any of the radio set mfgs they could
have saved themselves a lot of work, as I presume it wasn't only
Kriesler that used this method.


Were any of those 'radio set mfgs' certified for 'mil spec'
soldering? It's one thing to splash solder on a cheap paper based,
consumer grade PC board and quite another to have it pass inspection for
military applications.

No as far as I know they were only for commercial distribution - eg for
people who wanted a quality transistor radio.

But it wasn't about 'splashing..' it was dipping and then the board was
run by inspectors who then hand soldered any joints that even looked
suspect.
Click to expand...


That is float soldering, not wave soldering. A much older method, and
prone to quality problems. regency built two way radios that way at one
time, and they rarely survived the warranty period withoutout time on
the bench to clean up and resolder large areas of the board.


My job at the time was final testing and faulty part replacement of the
completed boards before they were mounted into their case. Though for a
few days I was one of the dry joint inspectors.

As far as I can remember there were very few faults due to dry joints by
the time the sets came to me.

But I know nothing about military specs etc so... But on a TV show last
night they mentioned that the rockets with the space program would have
up to 60,000 faults in a rocket I guess their specs were either not up
to military standard or the military needs to do some quality control ed.
Click to expand...

That's why they don't use lead free solder. Yhe US military and NASA
have their own standards that take weeks to learn at an approved
school. There is no way any US missle is going to leave the factory
with those kinds of problems. I have built electronics for NASA and the
ESA. You don't ship cold solder joints in $20,000 to $80,000 radios. I
have no clue about those built down under. :)


--
Greed is the root of all eBay.
 
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