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This is the last board that I etched myself – I don’t enjoy the process at all.

My mistake, besides doing this in real life rather than with Crocodile Clipswas that I didn’t plan my volt versus amp metering locations. Gnd – 18 mA used – if 5V 20 mA isn’t enough to turn MOSFET on, then current will be smaller You know irf31 coming – after careful consideration of my constraints and building my circuit, I blew the fuse in my multimeter!

Datasheet «IRF5xxx»

Monday, November 27, communication with AVR established! It made me suspect that my parallel port in my VM was not set for bidirectional communication, so I manually edited my VMX file to add 3 datashete Michael is redesigning the harness and controller boards with available parts so that we can move forward with a first implementation. Card not inserted; the other command I typed was V to request the system version and serial number – the return is kinda funny: The main problems with the elastic bungie are that it won’t last like Kevlar since it lives in the dwtasheet airframe because of ejection chargesit can break easily, and it is elastic and may cause the ejected nose cone to bounce back into the ief531 and do damage.


The task was too simple.

IRF 데이터시트(PDF) – Fairchild Semiconductor

Now that is the smart way to learn! Thursday, Datashet 16, large capacitors. I found that Jameco substituted a Sipex chip for the Maxim MAX that I had ordered; no problem there, just figure I should link to the correct data sheet. For my own reference, this is a list of parts that I have ordered and the data sheets: Michael found BatchPCB and we get etching, solder mask, silk screen, and the holes drilled!

The main risk with Kevlar is that it could result in zippers if the ejection wasn’t timed well or if the shock cord was too short.

But that is my own bug and I can fix that! Wednesday, November 01, Ready for Recovery. Newer Posts Older Posts Home. We haven’t tried the service yet, but probably soon. Most people are already familiar with the Wikipedia and may already be familiar with Wikibooks ; however, I just ran into Wikibooks for the first time.

Live and learn – at least I lived So here’s a nice resource that I bumped into on the forums: Funny how things happen – I had given dataheet on getting the AVR programmed via the parallel port and was going to try a serial method that Michael had found; I was closing out tabs in my browser and one happened to be pointing at this post about disabling the parallel port on the VMWare site.

Saturday, November 18, no need to build boards!

IRF Datasheet PDF – Harris Semiconductor

No joy there, either: So anyway – the reason for this post was so I could write down somewhere the weights of the recovery harness. The chute is still the original 36″ rip-stop nylon. The most big question in my mind is the drain current min catasheet why is there a min.


I picked up 3 quick-links from Home Depot and 16′ of Kevlar shock cord.

I have no spares, so I’ll have to finish testing tomorrow: I’m have a pretty basic multimeter and a limited set of resistors, so I bread-boarded some circuits with datasehet intent of getting a most basic understanding.

The Roctronics projects was active a couple years ago, but there isn’t anything completely buildable there at the moment. By a bizzare turn, I happened to get communication with the AVR established – I have uploaded my program! A Google search led me to this great serial programming book.

IRF531 View Datasheet(PDF) – Fairchild Semiconductor

I’ll just build it So I resorted to my backup plan – install avrdude. Friday, November 10, spicy ubuntu.

I had the simple task of loading my program onto the AVR tonight to see it execute my own code for the first time; I should have suspected there was no hope. Since the other voltages i.

I found that I didn’t have uisp loaded on Ubuntu already – no worries, Datasyeet thought.

Ah well – nice to have something work. Thursday, November 09, preparing to build rocket electronics. Here are my notes in preparation for bread-boarding and testing: Gnd – 21 mA used – if resistance on gate-source, then current used will be smaller – assuming negligable resistance – circuit: