Need advice for adding aux-in/line-in to Philips AE2160/00-A AM/MW/LW portable radio

Hey there, this is my first post! :)

I'm from Germany, so please excuse my grammar! :D

The reason why I'm opening up this new topic is, I didn't find any instructable or guide on how to add an aux-in/line-in to my simple mono AM/MW/LW radio Philips AE2160/00-A.
There's not much to find out about the technical specifications besides the standard product information:

Tuner
• Analogue tuning
• Wave ranges FM 87.5 - 108 MHz
MW 525 - 1606.5 kHz
/04 LW 150 -255 kHz
/00c FM/MW
/04 FM/MW/LW
/05 FM/MW/LW
• Ferroceptor for MW (and LW)
• Telescopic aerial for FM (and SW)

Amplifier
• Max. output power 300 mW RMS
• Tone control Music /News
Sound system
• Loud speaker 100 mm
• Metal grill

Power supply
• External supply
/00c, /04 230V
/05 240V AC
• Batteries 2 x 1.5V , type R20/D
cell/UM1

Connections
• Headphone socket 3.5mm

General
• Material Polystyrene, metal grill
• Weight (g) 520
• Dimensions (mm) 210 W x 150H

Here's a link to a photo of the device:
http://images.philips.com/is/image/PhilipsConsumer/AE2160_00-_FP-global-001?wid=2000&hei=2000&$jpglarge$

I didn't even find schematics/circuit diagrams for this or a similar device. There are lots of tutorials on how to add such an input to a car radio or a boombox/stereo cassette player a.s.o., but not for a simple AM/MW/LW radio.

My questions are:
1.) Are there any similar hack projects here in the step-by-step or forum section?
2.) How do I find the right connector or place to solder a 2-way-switch between the sections (tuner, amp, speaker)?
After the hacking job, it should be possible to switch between normal radio listening mode and aux-in/line-in mode from an external mp3 player, notebook, a.s.o..
3.) Is there anything else to know for this project?


Yesterday I've opened up the case for the first time and looked over the circuit board and the connections.
I had no cam to take pictures, but I try to take some mobile phone cam pictures of the circuitry and parts at the next opportunity!

Cheers,
arok1

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arok1 (author) 4 years ago
It's done!
After a long time of research, breaks and study of the radio board, switch and stereo-to-mono circuits, I've finished the mod!
Unfortunately, I haven't taken any photos, but here's how I've done it:
1) Use a dpdt switch (6 pins), but you can also use a spdt (3 pins) and a 3.5 mm stereo phone jack.
2) Drill 2 holes in (the front side of) the radio case, one for the switch and the other for the phone jack.
3) Sever the lead before pin 10 of IC 2132 (DET OUT, it's the demodulator out) with an engraving or milling bit of a kind of rotary multitool (Dremel or Proxxon-like).
4) Solder one 4,7k Ohm resistor (just an example, you can use other values, but the signal will get more quiet) on each channel pin (tip and ring) of the stereo phone jack, solder the ends together and solder one cable (this is your joint mono signal now) from the joint to the last pin on the switch.
5) Solder the ground of the stereo phone jack directly to pin 8 on the IC 2132, which is GND.
6) Solder pin 10 of the IC 2132 to the first pin on the switch.
7) Solder the other part of the lead close to pin 10 (e g. the available soldered "leg" of the resistor close to pin 10) to the middle pin on the switch.
8) Take an mp3 player or your mobile phone/smartphone, connect it with the new stereo phone jack on the radio, run the radio on vol. up to max and play some music on the mp3 player/mobile/smartphone. Toggle the switch to test, if it switches between radio play and external music play.
9) Is it working? If not, check the switch and stereo phone jack connections.
If it's working, congratulations, well done!
10) Mount the switch and the stereo phone jack onto the radio case, tape the new cables onto the inner side of the case if you like.
11) Reassemble the radio, fix and close it all with the existing screws.

That's it, that's all there is... .
arok1 (author) 4 years ago
I found out which are right connections. They're on the IC (TA)2132(P)!
I Put ground+"cold" together on the GND Pin (8) and tested the "hot" cable on the other pins until the FM signal, for example, was interrupted by my notebook's music from the line-out on pin 10 (DET OUT) or 11 (AFC) (I'm not sure, but I found out again next time)!
I'm ordering the parts in a few days and then it's time for an instructable! :)
Jayefuu4 years ago
In answer to part 2), you can buy 3.5mm jacks that contain a switch. This could be used to change between normal operation and aux-in operation when a plug is inserted.

This sounds like an interesting project, keep us updated!
arok1 (author)  Jayefuu4 years ago
Thank you for your quick comment and this advice!
Sounds really useful, but, is it really so easy like I'm inserting a 3.5 mm plug with an external audio device attached and it switched to aux-mode automatically? And does it switch to normal mode back automatically?
Jayefuu arok14 years ago
My comment's only part of the solution. You'll need to find out what the different parts of the internal circuitry of your radio do and find where the correct place to insert the pre-amplified aux-in audio. This will make a great Instructable, it'd be an interesting read if it contains advice for others to do similar on different devices. IE what the standard blocks are in different devices, how to go about finding datasheets for the circuits, how to modify them etc.

Also, this might help:
http://www.flyingtophat.co.uk/blog/17/adding-an-auxiliary-input-to-my-portable-radio
arok1 (author)  Jayefuu4 years ago
I'm sure, that the main part of this project has a lot to do with the IC of the radio, like it is described in the link you've posted. I'll definitely look after the name of the IC and then search for the datasheet on the web! :)
arok1 (author)  arok14 years ago
I found two ICs, one labeled "LS2822M and the other one labeled "TA2132P".
I didn't exactly find these, but close types, which may be similar.
The first one with the numbers 2822M could be the TDA2822M (manufacturers: ST Microelectronics, SGS Thomson Microelectronics), which is a dual low-voltage power amp.
The other one I've found today is a TA2132BP (manufactured by Toshiba) and it's an AM/FM Radio IC with 16 pins.
The things I have to test are, on which pins to put the stereo cable contacts and where is the best loudness peak, where it the audio signal doesn't distort.
arok1 (author)  arok14 years ago
A few days ago I was analyzing and testing the pins on LS2822M. While testing the GND (ground/"cold") and Input 1(+, "hot") pin on the IC with the equivalent contacts of a stereo line cable which was attached to a smartphone playing songs at the other end, THE SPEAKER PLAYED THE SONGS! :) Unforunately, the signal level was way too loud and there was a bit of distortion, even at a small turn on the radio's volume pot! Anyway, after this happening I was very happy, because the radios normal signals where interrupted by the line-in signal, as I hoped for.

I suggest that the aux-in has to be inserted somewhere before the inputs of the LS2822M!
At the moment I'm searching for the right connection somewhere on the other IC TA2132P or somewhere in between the two ICs...