May 26, 2013 in 8 Channel PDU by Joshua Oster-Morris
I just built up a rig to test the PDU under heavy transient load. Hopefully the gizmo can tame that into something a little bit less awful. That is 5A running into a large toroid inductor with a rapid low side disconnection. That gives us a 94 volt positive transient and 17 volt negative transient starting at 13.8V DC. That is plenty to grenade most semiconductors.
May 25, 2013 in 8 Channel PDU by Joshua Oster-Morris
I’ve put the finishing touches on the next iteration of the PDU today. I’ve put copious protection on all in the inputs and outputs. The device should be able to handle a 24V jump start as well as the significant transients (both positive and negative) found in auto environments. I’ll try to get these sent out to the fab house next week so I can get one more bike friendly prototype made up.
May 20, 2013 in 8 Channel PDU by Joshua Oster-Morris
This weekend we worked on documentation for this project. I’ve got a schematic drawn up showing an example setup. Hopefully it makes some sense to people.
May 13, 2013 in 8 Channel PDU by Joshua Oster-Morris
I was out of town all April, a mix of business and pleasure travel, so very little got done on this until the last two weeks. I was also able to acquire and repair a fancy 21 year old analog oscilloscope for a few hundred bucks that can run circles around my brand new several thousand dollar Agilent digital scope. With it, I was able to track down the last little problem I had with the constant current circuit and I am very pleased to report that it now works exactly as intended (I had one incorrect capacitor on the board which was slowing down the response at high duty cycles). All systems are now GO on the 8 channel Bluetooth PDU.
We are currently getting some up to date pricing on manufacturing and parts this week. This is an important part of the Kickstarter that we plan to get online ASAP. I am absolutely stoked with the gizmo we have made. It is exactly what I want on my bike and I hope all of you guys and dolls areas pleased with it as I am. The tasks left between now and the Kickstarter launch are business rather than technical related, so there be light at the end of the tunnel!