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Radio to mp3 player conversion.

Discussion in 'Audio' started by Pexy, Jun 4, 2018.

  1. Pexy

    Pexy

    139
    3
    Feb 21, 2016
    Greetings!
    I found a old Philips radio in the basement and would like to turn it into a mp3 player.
    My problem is that I don't know where to tap the input.
    The chip used in the radio is LA4160. there's a schematic in the datasheet and i tried in a few points but with zero success.
    Please help.
    Thanks.
     
  2. kellys_eye

    kellys_eye

    4,281
    1,144
    Jun 25, 2010
    At the volume control is the usual place.

    Apply your input directly across it - might need a capacitor to block DC, depends on the schematic. Can you post it?
     
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    9,277
    1,878
    Nov 17, 2011
    The datasheet shows the input of the LA4160 to be pin 9. Input your audio signal via a series resistor or attenuator on that pin.
     
  4. kellys_eye

    kellys_eye

    4,281
    1,144
    Jun 25, 2010
    Pin 9 is through the pre-amp. The MP3 device is likely to not require pre-amplification and the main amplifier input is via pin 4. Plus it's easier to find the volume control!
     
  5. Pexy

    Pexy

    139
    3
    Feb 21, 2016
    I will try it thanks.
     
  6. Pexy

    Pexy

    139
    3
    Feb 21, 2016
    I tried the point that was conected to the pin 9(10) and it didn't work. I will try it directly at pin 9 with resistor as you said.
     
  7. Pexy

    Pexy

    139
    3
    Feb 21, 2016
    thanks I will try it at volume control and pin 4 as well thanks.
     
  8. Harald Kapp

    Harald Kapp Moderator Moderator

    9,277
    1,878
    Nov 17, 2011
    Good point.
     
  9. ramussons

    ramussons

    340
    61
    Jun 10, 2014
    Hmmmm..... Is the radio working at all? At least some noise in the speaker....:confused:
     
  10. Pexy

    Pexy

    139
    3
    Feb 21, 2016
    Yes it is. Radio side of things at least. Cassette mechanical part not but audio part works.
     
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