Bizarre keyboard PCB - minimal solder joints, no chip - help!

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Posted by Ryan Mannion on 16, 2001 at 6:09 PM:

I am a complete electronics newbie, so please excuse any mixup of terminology and the like. I am attempting to build a few hand buzzers for "You Don't Know Jack" per the instructions at http://wrongcrowd.com/~arcade/ydkjp2.shtml. Unfortunately, the keyboard I'm using does not use any sort of microchip on the PCB, and thus there are no solder joints to connec to. What I see is a circular black lump on the board that a number of "tracks" (the etchings in the PCB that I guess are analogous to wires) are connected to. Is anyone familiar with the type of keyboard I'm describing? Is this keyboard hopeless?

Thanks in advance for your help.

Follow Ups:

Re: That's a chip Matthew C. Waterman 5/16/2001 (3)
- Re: Let me say that a different way Matthew C. Waterman 5/16/2001 (2)
  - Re: Better yet, here's a picture!!! Matthew C. Waterman 5/16/2001 (1)
    - Re: Better yet, here's a picture!!! Ryan Mannion 5/16/2001 (0)

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: I am a complete electronics newbie, so please excuse any mixup of terminology and the like. I am attempting to build a few hand buzzers for "You Don't Know Jack" per the instructions at http://wrongcrowd.com/~arcade/ydkjp2.shtml. Unfortunately, the keyboard I'm using does not use any sort of microchip on the PCB, and thus there are no solder joints to connec to. What I see is a circular black lump on the board that a number of "tracks" (the etchings in the PCB that I guess are analogous to wires) are connected to. Is anyone familiar with the type of keyboard I'm describing? Is this keyboard hopeless? : Thanks in advance for your help.

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