Download colcod software displays the color coding on resistors with 4 or 5 color bands

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1. 

   Hi Adam, You can connect a 12 or 18V DC source in the power connector, do not worry about polarity.

2. 

   I'm sorry to hear that you're experiencing issues with the amplifier circuit. It sounds like there may be a problem…

3. 

   Hi Rosario, Gerber PCB files available.