Wiring stereo jack directly to IC?
in [Repair]
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From: Eli Luong on 9 Jan 2010 20:00 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
From: mm on 9 Jan 2010 20:38 On Sat, 9 Jan 2010 17:00:31 -0800 (PST), Eli Luong <eliluong(a)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
From: David Nebenzahl on 9 Jan 2010 20:50 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? 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"
From: Sjouke Burry on 9 Jan 2010 21:39 mm wrote: > On Sat, 9 Jan 2010 17:00:31 -0800 (PST), Eli Luong > <eliluong(a)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.
From: stratus46 on 10 Jan 2010 00:57 On Jan 9, 5:00 pm, Eli Luong <elilu...(a)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? G²
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