What is 'Pre voltage'?

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dk01152

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First I would have to apologize for my bad english

Nowadyas I have been trying to understand a circuit diagram and I saw 'Pre 12V' or 'Pre 24V' is applied on a capacitor or IC chip. But I dont know what they mean.
It is diffrent from just 12V or 24V?
 

It could be anything: 12V for the preamplifier, vs 12V for the motor, for example. Without a specific example it's impossible to provide a more accurate guess.
 

my guess would be that there is some 12V input with some filtering/regulation. "12V" might be used for the filtered version and "pre 12V" for the unfiltered version. But you would need to look at the schematic to see if there is some other logical meaning.
 

Hi,

I have been trying to understand a circuit diagram
Click to expand...
then why not showing this circuit diagram?

Klaus
 

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