Arcade Collecting > Pinball

Why are UDN chips so rare when...

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RayB:
all these guys make them:

http://www.chinaicmart.com/buyer/search.html?keyword=UDN7180a&searchtype=1&sel1=1

Pinball Wizard:
What are these chips used in?

If you want to talk about rare chips try and find the original chip for my Say-It-Again board in my Centaur. I gave up and are eventually just going to build a replacement board for it.

RayB:
The UDNs control segments in high voltage glass displays like you find in pre DMD as pins.  I learned from someone that though there are companies claiming to make them, they are mostlymcompletely unreliable or don't work at all.

Q*Bert_OP:

--- Quote from: RayB on November 12, 2010, 06:56:37 pm ---The UDNs control segments in high voltage glass displays like you find in pre DMD as pins.  I learned from someone that though there are companies claiming to make them, they are mostlymcompletely unreliable or don't work at all.

--- End quote ---

Correct. These chips are often counterfits, and usually don't work. Same thing with the 6821 PIAs...good luck finding these new.

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