The Anker Power Bank (25K, 165W, Built-In and Retractable Cables) is priced at $99.99 / £89.99. For a high-capacity battery ...

Unlike most laptop chargers you’re used to, the power converter is in the cube that plugs into the wall, rather than in a brick halfway along the cable. It means the whole wire coming to your ...

this project was built around a generic 24 Volt laptop power brick. An ATmega8 generates a PWM signal that is sent though a low-pass filter, allowing everything to be very precisely controlled.