Good day folks. Today I had to work on a power supply/battery charger which had some parts arranged in a manner which intrigued me. It is a proprietary board that's part of an alarm panel and it also acts as a charger for a backup SLA battery. It's a very basic supply, with no proper battery management: have a look at the terminals and you'll immediately see how it works. There's a 14v output and there's a "BAT" output, which basically just ties the battery in parallel to the supply, but not directly, instead through a diode and resistor, as outlined on the doodles I did on the back....
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