(Topic ID: 83912)

Announcing new product to help resolve resets in WPC era games

By rkahr

10 years ago


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  • 460 posts
  • 182 Pinsiders participating
  • Latest reply 2 years ago by Rdoyle1978
  • Topic is favorited by 153 Pinsiders

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#131 9 years ago

Distributed power using point of use DC-to-DC switching supplies -- too bad these old Williams boards weren't designed like that to begin with. I wish the current capability was a bit higher as those could have been shoe horned into other places as well...

With the demise of the LM323K voltage regulator used in ton's of machines - little switchers such as these or the ones made by companies such as Texas Instruments look to be the answer. Pull out that old LM323K, install a highly efficient 5V, 5A regulator (able to drive LED displays in addition to CPU, etc) -- more current, less heat and a more reliable machine. I don't have the time to work on my LM323K drop in board (which also covers 2N6059 series pass transistors) but *maybe* somebody else here does ... hint, hint.

3 weeks later
#156 9 years ago
Quoted from rkahr:

Thanks Ingo. I put a lot of effort into documenting the solution and a couple of Pinsiders were very helpful with critical review pre-release.
Keep your eyes on ezSBC.com - they are very close to an initial production run of a drop-in replacement that is the size of the LM323, exceeds the spec's, and shouldn't need a heat sink....
-Rob
-visit http://www.kahr.us to get my daughterboard that helps fix WPC pinball resets

Yup, I've seen it ... looking pretty.

Take special note of this:
"Even though the accuracy of this design is +- 2% instead of the +-5% of the original LM323 I included the trimmer to allow fine adjustment of the output voltage. In many applications where the LM323 were/are being used the 4.75V minimum voltage of the LM323 caused problems so people made arrangements to increase the voltage by some other means."
Gotta like it.

Ed

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