7 Temmuz 2010 Çarşamba

Batteries and Power Management

Batteries
Patrick has two 7Ah SLA batteries right where its kidneys are located. These batteries provide approximately 140Wh energy. This means about 4 hours of play at 30 watts, which would be the maximum average power requirement at full volume. For a more sensible volume level which would require only a few watts, the batteries can make it for one day easily.

Jobs pitching about the battery life of his toys--similar values with Patrick

Power Management
Patrick has a killer power management system based heavily on "the show must go on" principle. The system normally uses battery power. However, if an external power supply with adequate voltage is connected, it seamlessly switches to external power and begins charging the batteries (if the charge switch is on). When the power supply is disconnected again, the system quickly reverts back to battery power.

Mr. Emmett Brown

For the power management section, all the switching is done using relays. I just like the clicking noise and mechanical nature of relays. They are my favorite electronics parts. (Once I had come across an high end audio preamplifier which uses relays instead of potentiometers for volume level adjustment. It had loads of relays inside of it and kept clicking each time you change the volume. It was the loveliest thing.)

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