With this DC Linear Power Supply, you can power stereos, alarm systems, LED lighting, and most other electronic devices directly from a bulk storage battery or solar panel with crystal-clear performance and high efficiency. Gone forever is the interference so often associated with AC inverters and complex wiring systems. Also the "shot noise", squeal, and short life so characteristic of low cost, single stage converters. You can even use this Power Supply to recharge batteries at the exact voltage listed on the battery case by the manufacturer for optimal charging performance and maximum battery life.
Voltage is not only reduced to a preset, adjustable level, but held steady regardless of shifting parameters such as low or charging battery and load variations. Meanwhile, annoying and potentially harmful spikes and power surges are heavily dampened by the patented, two-stage design. "Ground loops", which result in hum in audio and false triggering in alarms, are essentially eliminated.
FEATURES - Reduces battery voltage to a preset, adjustable level. - Holds delivered voltage steady. - Removes annoying interference. - 12V and 24V battery versions available.
APPLICATIONS - Stereos, LED lighting, alarm systems. - Battery charging. - Prevent overvoltage from an "equalizing" or multistage battery charger.
DC Linear Power Supply 
Adjustable and regulated power for electronics.