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a 9V battery and 1 Amp of average output current means the regulator is burning off (9 - 5)*1 = 4 Watts
After that
Product OLED FeatherWing 128x32 OLED Add-on For All Feather Boards Display resolution / matrix 128x32 Interface I2C Platform fit Adafruit Feather Size 0
Color: White
Servos usually need power
Switching Power Supply 5V 20A 100W 3403 a 9V battery and 1A switching power supply is a type of power supply that uses semiconductor switching techniques versus the standard linear methods to provide the required output voltage. The basic switching converter consists of a power switching stage and a control circuit. QUICK SPECS: Input Voltage: 110 220VAC ~15% Frequency: 50 60 Hz Output Voltage: 5 VDC 20A Dimension L x W x H: 200 x 100 x 40 mm
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