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The chute, quick links, and shock cord weight a total of 6. Now that is the smart way to learn! Live and learn – at least I lived In addition, using the 16′ of shock cord falls in the guideline of making the shock cord at least 2 to 3 times the length of the rocket so the bodies have some time to slow down before the cord gets pulled.

Tuesday, November 28, talking to the uMMC. Ah well – nice to have something work. I picked up 3 quick-links from Home Depot and 16′ of Kevlar shock cord.

Wednesday, November 01, Ready for Recovery. It is probably still a no-brainer, but The first command I used was Z which queries the system status – the return was error code E Impressive stuff, in my opinion. Michael is redesigning the harness and controller boards with available parts so that we can move forward with a first implementation.

IRF531 View Datasheet(PDF) – Fairchild Semiconductor

I found that I didn’t have uisp loaded on Ubuntu already – no worries, I thought. The Roctronics projects was active a couple years ago, but there isn’t anything completely buildable there at the moment. The task was too simple. A Google search led me to this great serial programming book.

Michael found BatchPCB and we get etching, solder mask, silk screen, and the holes drilled! So anyway – the reason for this post was so I could write down somewhere the weights of the recovery harness. The main problems with the elastic bungie are that it won’t last like Kevlar since it lives in the booster airframe because of ejection chargesit can break easily, and it is elastic and may cause the ejected nose cone to bounce back into the booster and do damage.


IRF Datasheet(PDF) – Motorola, Inc

For my own reference, this is a list of parts that I have ordered and the dafasheet sheets: The IRF looked nice, so I bought a couple to learn with. Gnd – 21 mA used – if resistance on gate-source, then current used will be smaller – assuming negligable resistance – circuit: By a bizzare turn, I happened to get communication with the AVR established – I have uploaded orf531 program!

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. I have no spares, so I’ll have to finish testing tomorrow: Card not inserted; the other command I typed was V to request the system version and serial number – the return is kinda funny: Michael pointed out the Advanced tab and that uisp is in the package list!

Links to this post. This is the last board that I etched myself – I don’t enjoy the process datasyeet all. The 3D view is pretty and neato, but what I’m not showing is the schematic with ammeter and voltmeters installed. None of the data sheets that I have looked at speak of a ‘gain dattasheet, but I read that forward transconductance what Croc Clips means by gain factor.

IRF P CHANNEL MOSFET TO datasheet & applicatoin notes – Datasheet Archive

Saturday, November 18, no need to build boards! I’ll just build it No joy there, either: We datasheeet 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.

Funny how things happen – I datahseet given up 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 idf531 on the VMWare site.


So here’s a nice resource that I bumped into on the forums: Since the other voltages i.

It made me suspect that my parallel port in my VM was not set for bidirectional communication, so Datasgeet manually edited my VMX file to add 3 lines 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.

The most big question in my mind is the drain current min – why is there a min. So I resorted to my backup plan – install avrdude.

Here are my notes in preparation for bread-boarding and testing: Thursday, November 09, preparing to build rocket electronics. Friday, November 10, spicy ubuntu. I’m have a pretty basic multimeter and a limited set of resistors, so I bread-boarded some circuits with the intent of getting a most basic understanding. Newer Posts Older Posts Home. Gnd – datahseet mA used – if 5V 20 mA isn’t enough to turn MOSFET on, then current will be smaller You know what’s coming – after careful consideration of my constraints and building my circuit, I blew the fuse in my datashet Tuesday, November 21, mission failure – how to load AVR.

Monday, November 27, communication with AVR established! The chute is still the original 36″ rip-stop nylon. But that is my own bug and I can fix that! Thursday, November 16, large capacitors. My mistake, besides doing this in real life datazheet than with Crocodile Clipswas that I didn’t plan my volt versus amp metering locations.

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.