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Purpose of 9-Volt Battery in Pearl?
Purpose of 9-Volt Battery in Pearl?
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Old 13th January 2007, 04:42 PM   #1
rgheck is offline rgheck  United States
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Default Purpose of 9-Volt Battery in Pearl?

What is the purpose of the 9-volt battery in the Pearl? There seems to be no reference to it in Wayne Colbrun's original piece. It just appears out of nowhere in the final schematic. It also seems to be marked "optional" on the main board. Is it indeed optional?
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Old 13th January 2007, 06:04 PM   #2
steenoe is offline steenoe  Denmark
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Is it indeed optional?
Yes it is optional, indeed. I agree it appears out of the blue It serves as a 9V reference if you dont want to use the Zener of 9,1V. Most people just disregard the battery reference and leave it out alltogether

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