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Can the same 9V supply used to power Arduino, also be used on the output side of a relay? - Project Guidance - Arduino Forum
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Amazon.com: ALAMSCN 3.3V 5V MB102 Solderless Breadboard Power Supply Module with 9V Battery Clip Power Cable 2.1x 5.5mm Male DC Jack Plug for Arduino (Pack of 3) : Electronics
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How long will a 9V alkaline battery power my circuit (Arduino, DHT11, ESP8266)? - General Electronics - Arduino Forum
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Amazon.com: Gikfun 9v Battery Holder with ON/Off Switch for Arduino (Pack of 2PCS) EK2107x2 : Electronics
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