(Topic ID: 211448)

A Pecos Diary - My Journey to Pinball Operator


By Pecos

2 years ago



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  • 86 Pinsiders participating
  • Latest reply 3 months ago by Dono
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#49 2 years ago

I've got no idea what was in the service bulletin about the bridged capacitors... But mixing the ceramic with the electrolytic does change things. Total capacitance goes up (c Total = c1 + c2) Frequency response changes slightly since the devices have different characteristics (ESR - equivalent series resistance differs) Also they behave differently for reverse voltage.
I wouldn't be surprised if the original design either should have had a higher capacitor value or required two different types for frequency response characteristics.
Bridging them was definitely a low cost modification that didn't add to much to the manufacturing process.
It's been a long time since I've thought about hardware design at that level! Kind of fun to see this since I doubt modern hardware sees many changes like this.

Good luck with the journey!

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