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Links to this post. Wednesday, November 01, Ready for Recovery.

IRF Datasheet PDF Harris Semiconductor –

Card not inserted; the other command I typed was V to request the system version and serial number – the return is kinda funny: Gnd – 21 mA used – if resistance on gate-source, then current used will be smaller – assuming negligable resistance – circuit: 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 lines The IRF looked nice, so I bought a couple to learn with.

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. Now that is the smart way to learn!

This is the last board that I etched myself – I don’t enjoy the process at all. So I resorted to my backup plan – install avrdude. Friday, November 10, spicy ubuntu. 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. I picked up 3 quick-links from Home Depot and 16′ of Kevlar shock cord.


Since the other voltages i. Most people iff531 already familiar with the Wikipedia and may already be familiar with Wikibooks ; however, I just ran into Wikibooks for the first time.

I’ll just build it I have no spares, so I’ll have to finish testing tomorrow: 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. It is probably still a no-brainer, but 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’m have a pretty basic multimeter and a limited set of ief531, so I bread-boarded some circuits with the intent of getting a most basic understanding.

I found that I didn’t have uisp loaded on Ubuntu already – no worries, I thought. The most big question in my mind is the drain current min – why is there a min. Saturday, November 18, no need to build boards! Tuesday, November 28, talking to the uMMC. The Roctronics projects was active a couple years ago, but there isn’t ddatasheet completely buildable there at the moment.

Ah well – nice to have something work. So here’s a nice resource that I bumped into on the forums: A Google search led me to this great serial programming book.

IRF531 MOSFET. Datasheet pdf. Equivalent

For my own reference, this is a list of parts that I have datashert and the data sheets: Funny how things happen – I had given up on getting the AVR programmed dataeheet 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.

Thursday, November 16, large capacitors. Here are my notes in preparation for bread-boarding and testing: Tuesday, November 21, mission failure – how to load AVR. By a bizzare turn, I happened to get communication with the AVR established – I have uploaded my program! Thursday, November 09, preparing to build rocket electronics.


So anyway – the reason for this post was so I could write down somewhere the weights of the recovery harness. None of the data sheets that I have looked at speak of a ‘gain factor’, but I read that forward transconductance what Croc Clips means by gain factor.

The first command I used was Z which queries the system status – the return was error code E The task was too simple. 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. The chute is still the original 36″ rip-stop nylon.


datashret Monday, November 27, communication with AVR established! Gnd – 18 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 multimeter!

My mistake, besides doing this in real life rather than with Crocodile Clipswas that I didn’t plan my volt versus amp metering locations.

We haven’t tried the service yet, but probably soon. Michael is redesigning the harness and controller boards with available parts so that we can move forward with a first implementation. No joy there, either: Michael found BatchPCB and we get etching, solder mask, silk screen, and the holes drilled! Impressive stuff, in my opinion.