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sectrix's blog
Archive for February, 2008
Posted by sectrix | Feb 12, 2008 @ 08:30 PM | 7,920 Views
An idea on how to make a starter/generator circuit. When switching to live power, the generator relay will switch on first, then the battery relay will switch to the charger. When going back to battery, it will first switch on, then the generator relay will switch to start. The DC/DC will need to be able to take both of the sources at once. The system defaults to battery/start mode, in case the engine dies in flight.
Posted by sectrix | Feb 08, 2008 @ 12:10 PM | 1,895 Views
I've found the camera and Tx/Rx I plan to use on RangeVideo. I'll use their 1W 2.4 GHz transmitter and their standard receiver. I like their IF FPV camera, and have heard nothing but good things about it, so I'll use that too.

The electrical system is a bit tricky. Relays will switch the motor between the ESC and a full-wave rectifier. Problem is that as soon as the avionics switch from batteries to live power, they'll lose power for an instant. Which means the relays will too, which means they'll probably never be able to switch. To get around this, I'll have to apply both batteries and live power for a second, then switch off the batteries. I'll also have to not charge the batteries until they are not providing any power...

It isn't as hard as I thought it would be, but I'm gonna need a lot of relays. I'll post a block diagram as soon as I make it.