9 Volts 300mA or more (500mA is common and will work fine) AND make sure the TIP is set to Positive "+". Look for the opening in the center of the polarity diagram to face the + symbol.
9 Volts 300mA or more (500mA is common and will work fine) AND make sure the TIP is set to Positive "+". Look for the opening in the center of the polarity diagram to face the + symbol.
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