Connect with us

Op-Amp Substitution

Discussion in 'Electronic Repair' started by [email protected], Feb 23, 2013.

Scroll to continue with content
  1. Guest

    Odd Question. I am repairing a Sony mixer for a friend and it has a bad JRC 5023 op amp. It is dead-shorted - so I know it is bad. The rest of the board, diodes and transistors check OK.

    As it happens, from a previous repair, I happen to have some jfet LF356 op amps in stock.

    The operating voltages are within range. But the 5023 is a video/audio amp, the 356 seems to be 'more so'.
    Given that there is some urgency on this and the mixer is quite obsolete (1980s vintage), waiting to get the parts from Mouser (Not in stock) or Newark, Digikey and so forth is easy enough but for the time constraint.

    NOTE: I can troubleshoot discrete components and such easily enough. I boggle a bit at ICs, so thanks in advance for any suggestions.

    Peter Wieck
    Melrose Park, PA
     
  2. Phil Allison

    Phil Allison Guest

    ** No hits on that number, but Intersil make a version - the HA5023

    http://www.intersil.com/content/dam/Intersil/documents/fn33/fn3393.pdf

    Mighty unusual to find one in a audio desk.

    ** Probably work OK, but the common NE5532 is a lot closer.

    I would put an 8 pin DIL socket in the PCB for safety.


    ..... Phil
     
  3. Phil Allison

    Phil Allison Guest

    ** What sort of "mixer" ??

    Audio or video ???




    ..... Phil
     
  4. Guest

    Audio.
     
  5. Guest

  6. Phil Allison

    Phil Allison Guest


    ** I strongly believe the op-amp IS in fact JRC5532.

    JRC used to make them under licence from Signetics.

    The numbers on the pack may be poorly printed or worn after 30 years.

    Using an op-amp with the part number you supplied in an audio desk is non
    credible.



    ..... Phil
     
  7. Guest

    I didn't know SONY made kitchen appliances<g>.
     
  8. Guest

    Phil:

    5023 is the correct part number. It is listed as such on the schematic, and there are several of them in the unit. Non-credible or otherwise, that is the one. The original question remains - is the Jfet substitition feasible?

    Peter Wieck
    Melrose Park, PA
     
  9. whit3rd

    whit3rd Guest

    Well, if it's really a single-unit op amp (eight pins, with output on pin #6), there's lots
    of substitutions, including LM356, that might work.

    JRC (Japan Radio Corp) usually uses NJMnnnn part numbers, and their
    low-noise audio single op amp that's most likely is NJM5534 (which has already
    been suggested). If there's a JRC5023 marking, it's possibly a house-numbered
    part (in mass production, it's common to deliver chips with markings specific
    to a customer).
     
  10. Guest

    All of which makes perfect sense - except that there is a 5023 part number made by various makers that is listed as a direct substitution.

    In any case, I will purchase a couple of sockets and drop in the jfet unitsthat I have and report back. For the record, during my research into this a little bit, the JRC5023 was pretty much reviled by those who favor this mixer - and although the same 4-digit part number was often suggested, it was always by a different maker.

    Thank you all for your replies - I was not trying to raise any controversy,just ask a simple question. So far, I have gotten a 'might' and a 'possible'. Good enough to see if it will suit the need for the moment. Meanwhile, I will order the correct parts should the 356 fail in practice.

    Peter Wieck
    Melrose Park, PA
     
  11. Phil Allison

    Phil Allison Guest

    ** FFS purchase a couple of NE5532s as well.

    These are low noise, low impedance devices and the LF356 is not.


    For the record, during my research into this a little bit, the JRC5023 was
    pretty much reviled by those who favor this mixer - and although the same
    4-digit part number was often suggested, it was always by a different maker.


    ** Horse poo.
    ** That was no simple question - piss head.

    The 5023 op-amp is an RF type that has no place being used in an audio
    mixer.


    ** Really?

    How surprising !!!

    You supplied us NO info on what purpose the op-amp was being used for or
    even what Sony desk it was.

    I see age has not made you any wiser, Peter.

    You are still the same shit head you always were.


    .... Phil
     
  12. Guest

    What is the model number of the mixer? I should be able to get the actual Sony part number and provide a sub.

    Dan
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-