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using a TDA 8170 instead of a TDA 8177F?

Discussion in 'Electronic Repair' started by b, Nov 13, 2008.

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  1. b

    b Guest

    these two vertical output ics seem almost identical, i think the 8170
    needs a ref voltage on pin 1. can they be interchanged? if so, what
    mods if any will be required.
    cheers. B
     
  2. b

    b Guest

    Hi Dave
    thanks a lot for the info. I actually picked up a couple of TDA8177
    from my local supplier for about 2€ each. Have yet to test the set
    extensively but I did replace the IC and cap you said, and two 1000uF
    16v caps providing a +10v and -10v to the ic (used 35v 105º types).

    coincidentally I now have another set to fix, with a similar fault,
    only it uses a TDA8178S - do you think the TDA8172 would work there?
    the TDA 8178S is more expensive, at least in my local store. Ben
     
  3. b

    b Guest

    thanks again Dave. I have got the datasheets now. and will follow it
    up.
    I just checked the set in which I changed the TDA 8177F, the pumpup
    cap would appear to be 33uF. I suspect a slightly higher value may
    have been wise for reliability, who knows. reminds me of the vestel
    11AK30 chassis line drive decoupler which is 10uF and many techs I
    have spoken to replace it with a 47uF, since things run cooler that
    way.
    -B
     
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