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USB Pseudo Battery

Replaces 1.5-V AAA cells

Based on a Labs project | April 2015 | Find it here
USB Pseudo Battery
In one respect all batteries are identical: sooner or later they die on you! Even rechargeable types are not immune from this problem, as they always need charging again. This makes indoor use inconvenient of devices designed only for portable use, with no provision for connecting an AC adapter. All the same, wherever you find electronic gadgets a solution is not far away. A pseudo-battery with a USB connection provides permanent power.
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Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list
Component List
Default: 5%, 100mW, SMD 0805
R1 = 47Ohm
R2 = 220Ohm
R3 = 330Ohm
Default: 10%, multilayer, SMD 0805)
C1 = 100nF
C2,C3 = 10µF
D1,D2 = S1a (DO-214AC or SMB)
IC1 = LM317 (SOT-223)
PCB # 150245-1 v1.0

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