What a shame when your compact scheme is ruined by a great big battery. Most boards require a stable voltage of 5 V, so you need to use at least 4 AA or 6 NiMH batteries and connect them through a step-down (buck) converter. Another solution is to use a step-up (boost) converter, which will stablize and increase the voltage.
With this module you can assemble a miniature device that is fed from a clock battery. You could even use a C battery, or maybe 2 AA batteries!
The output voltage is set by a trimmer. The output voltage range is between 5 V and 28 V, but sometimes the timmer's mark can be off. It is important to verify the voltage using a multimeter before you attach anything.
The minimum input voltage of the module is 2.7 V which means it can power devices from just one Li-Ion or two alkaline batteries.
Any energy conversion under real conditions has losses. However, this is Amperka! We've worked our hardest to get the highest possible efficiency. For our module it is 0.8-0.9 depending on input and output voltages/current.
To make it easy to understand whether there is an output voltage, or not, we provided led on the board. Its brightness is almost independent of the output voltage since it is powered seperatly.
The module is based on the LM27313XMF chip.
The connection of this Troyka module differs from the standard one, it uses two 3-pin jumper cables as it has a two terminals. One of them is for input power and ground, the other is for the output. Input and output ground are electrically connected to each other. For convenience, we have labeled the designation "GND", "Vin" and "Vout" directly to the board next to the terminals.