Intro My cheap plug in hot glue gun died and looking for a replacement I found this: the Bosch Glue Pen What does it do? it’s a hot glue gun for 7 mm glue sticks that warms up in 15 seconds.... Read more
Ultra-Low Power LiPo Charger via Energy Harvesting from a Solar Cell What is it? This is a small (0.5 x 0.5 inch) breakout board for Texas Instrument’s BQ25504 Ultra Low Power Boost Co... Read more
Li-ion cells become more and more popular due to their capacity and reasonable prices. In this entry I will show how to build a simple li-ion battery charger based on MCP73831 chip. It... Read more
I designed this circuit for the same reason that i designed the SMPS Boost regulator with the MCP1640 – To gain experience in SMPS technology. This time i use the high power LM2595 buc... Read more
Like other simple, single-cell lithium-ion battery chargers, Microchip’s MCP73812 provides no means of indicating the charging status. You can remedy this situation by adding four components... Read more
Sealed Lead Acid batteries are often used in amateur radio as a convenient power source for radios, since amateur radio equipment has standardized on 12.6V. The Cal Poly Amateur Radio Club e... Read more
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