This product is no longer available for sale. The seller may be offering an improved version or it may be hanging out on the beach, enjoying the retired life.
This board is great for powering circuits that need 5V from a low input voltage such as a LiPo or 2+ AA batteries. The main IC is a Texas Instruments TPS61240. The enable pin is broke out to both the input and output side to allow enabling/disabling the regulator from either side. The ENJMP pads are soldered with a 0 Ohm resistor connecting VIN to ENABLE allowing an always on state. The resistor can be easily removed with a soldering iron. The header pins are arranged so they fit in a standard solderless breadboard (0.1" / 2.54mm spacing). You will receive the board with all surface mount components soldered and 6 through hole header pins not soldered.
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I am a maker/tinkerer with a background in computer, electronics and smart device repair. My products are hand assembled by me in Peoria, IL USA.