Nov 152017

Maybe many of you will recognize this IC and throw up hands in horror:

This is the ‘infamous’ ‘HB-41’ used on several arcade PCBs (from Seibu/TAD Corporation but not only) :

  • Raiden
  • Blood Bros
  • Legionnaire
  • Sky Smasher
  • Toki
  • Dynamite Duke
  • Olympic Soccer ’92
  • Cabal
  • Heated Barrel
  • Operation Wolf

This analog component (20 pin SIL package) is used in sound circuit to mix background music and sound FXs as well as it acts as filter of both.From my experience (maybe also others can confirm it) it’s a prone to failure part.Let’s take a look at what is inside it:

As you can see from above scan the custom is built around two ICs :ย  a dual operational amplifier and a quad operational amplifier.All the rest are resistors (also printed film ones, the black squares), ceramic and tantalum capacitors.In order to reproduce it, after removed the epoxy, I pulled all the parts and metered them then I drawn schematicsย  which then I routedย  ending up in a 5.3 x 1.8cm PCB:

More or less same dimensions of original part:

Here is how it looks assembled:

I used an LM358 and LM324 for my testing which maybe are not the best solution since the original OP-AMPs have both high gain bandwith (10MHz) but the replacement works well on all PCBs I tested so far.Here is testing on a Cabal, Blood Bros and Toki PCBs:

See you all to next reproduction project!

 Posted by at 10:28 am

  12 Responses to “Seibu ‘HB-41’ reproduction”

  1. Awesome job as always caius, you are doing so MANY good things for this community!
    Can’t thank you enough for all the help you have given me!


    • Happy to serve the community (although for now I can’t release files of all my projects) and help you ๐Ÿ™‚
      But it does not end there! ๐Ÿ™‚

  2. Very good work, as always !
    Are you interested by a Kaneko mc-1091 ? (broken in 2 parts, already “decaped”)

    • Thanks.Yes, I know the Kaneko ‘MC-1091’ (present also on Heavy Unit but with differerent dimensions and marking) and I have some scrap boards with it.It’s on my TO-DO list but I think reproducting it is quite a challenge due ZIP46 package and parts on both sides.Anyway I can see four ICs, do you confirm me they are BUS drivers (74LS367-368)?Did you draw schematics of it?

  3. Great job Caius!
    I’m myself too lazy to make a nice replacement board for the Capcom Sound module 85H001…

  4. Hi,
    The 4 ICs on the Kaneko MC-1091 are 74LS253. Unfortunatly I don’t have knowledges to draw schematics even if I’ve learned more and more things by reading repair logs posted on Jammarcade.
    Maybe I can send to you the broken MC-1091 ? (for free of course ๐Ÿ™‚ )

  5. Hello,

    Iโ€™m definitely interested to obtain one to fix my original Toki PCB, do you sell it?


    • I was aware of your work but actually I drawn schematics myself.Later I found yours were partially incorrect/incomplete (missing connections, component values and postitioning).Anyway we always appreciate your incredible work on arcade hardware and personally I’m looking for a cooperation with you for other projects I have in mind.

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