MicroUSB Plug to 5.5/2.1mm DC Barrel Jack Adapter : ID 2727 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Adafruit Industries, Unique & fun DIY electronics and kits MicroUSB Plug to 5.5/2.1mm DC Barrel Jack Adapter : ID 2727 - The premise of this MicroUSB Plug to 5.5/2.1mm Jack adapter is simple. There's a MicroUSB plug on one end and a 5.5mm/2.1mm DC barrel jack with center positive polarity on the other. This allows you to connect one of our 5V 2 Amp, 5V 4A or 5V 10 Amp adapters to something that expects to connect
The premise of this MicroUSB Plug to 5.5/2.1mm Jack adapter is simple. There's a MicroUSB plug on one end and a 5.5mm/2.1mm DC barrel jack with center positive polarity on the other. This allows you to connect one of our 5V 2 Amp, 5V 4A or 5V 10 Amp adapters to something that expects to connect to 5V USB. We also have a shorty adapter-without-cable version

USB A Jack to 5.5/2.1mm jack adapter : ID 988 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits

MicroUSB to 5.5/2.1mm DC Barrel Jack Adapter : ID 2789 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits

LANMU USB to DC 12V Adapter, 2.1mm X 5.5mm USB 5V to 12V Step Up Converter DC Jack Power Cord,USB to DC Cable (3.3ft/1m) : Electronics

MicroUSB to 5.5/2.1mm DC Barrel Jack Adapter : ID 2789 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits

MicroUSB Plug to 5.5/2.1mm DC Barrel Jack Adapter : ID 2727 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Adafruit MicroUSB Plug to 5.5/2.1mm DC Barrel Jack Adapter [ADA2727] : : Electronics & Photo

30 Piece 5.5 / 2.1mm to DC Barrel Jack Adapter Kit : ID 5474 : $10.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Hrmph! All I have is a power supply with a 2.1mm plug and my doodly-whatsit has a 2.5mm jack. I keep trying to force the plug to fit but that 0.4mm

2.1mm to 2.5mm DC Barrel Plug Adapter

adafruit-5.5 / 2.1mm Barrel Connector - DC Power Plug ADA3310