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ramapcsx2 / gbs-control

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Questions about clock generator wiring #355

Closed robot-ave closed 2 years ago

robot-ave commented 2 years ago

Hi, I've got this all set up and it's working great. I am looking into ways to make my installation a little bit cleaner/more compact, and I have 2 questions about the clock generator wiring -- specifically, the rationale behind using the right side of C47/C48 to power the clock generator.

  1. Is there any reason to not use the VIN pad on the clock generator?
  2. Could you pull 5V from P9 on the GBS board, the same source that powers the ESP8266?

The description of the clock generator I bought says the following:

We put this handy little chip onto it's own breakout board PCB, with a 3.3V LDO regulator so it can be powered from 3-5VDC. We also put level shifting circuitry on the I2C lines so you can use this chip safely with 3V or 5V logic.

Based on this, I'm led to believe that it should work, but I haven't seen anyone else try this configuration (unless I'm missing it, which is also likely).

robot-ave commented 2 years ago

Never mind, it was discussed on Shmups in 2020:

Clock gen board power input location recently discussed. It avoids on board regulation and the recommended location is best to ensure no difference in potential.

Guess I was missing it :-)

Source for visibility: https://shmups.system11.org/viewtopic.php?p=1414753#p1414753