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by OverTheTop
Sun Jul 05, 2009 9:44 pm
Forum: How's the Weather..?
Topic: Michael Jackson is dead :-(
Replies: 8
Views: 1372

I just worked out why he used to wear one white glove! He was actually a very dedicated model rocket builder. He used to use one gloved hand to form the fin-fillets of PVA glue, or smear the CA glue onto the surface of the body-tubes. The other hand held the piece being worked on and didn't need a g...
by OverTheTop
Fri Jul 03, 2009 9:07 am
Forum: Scratch Built
Topic: The best materials
Replies: 4
Views: 1053

The cardboard body tubes available for rocketry seem to be just about perfect for the job. Not too heavy, strong enough for the job. Suburban rocketry has a great selection of sizes. Post-pak tubes (got one the other day) seem a bit too heavy for the low-mid power stuff, but if you want to put up wi...
by OverTheTop
Tue Jun 30, 2009 10:38 am
Forum: Electronics
Topic: GPS Telemetry project
Replies: 297
Views: 40527

Those caps aren't that small. A little practise with your soldering technique will improve your opinion of them. You get used to it! Have a look at some 0201 components (0.5mm x 0.25mm). They look like grains of sand. The pads on the PCB can not extend past the edges of the component or the surface ...
by OverTheTop
Sun Jun 28, 2009 1:26 pm
Forum: Electronics
Topic: GPS Telemetry project
Replies: 297
Views: 40527

I suppose there is always the possibility it will lead you to a point 5m AGL where you find the rocket stuck in a tree...
by OverTheTop
Sat Jun 27, 2009 8:22 pm
Forum: Electronics
Topic: MAD! Of Course!
Replies: 7
Views: 1767

Just tested my first home-made ejection charge. Worked well. :) I took a some Christmas Tree lamps and cut the glass bulbs off (back to the plastic) with sidecutters. I then made a paste with a small amount of FFFg black powder that I ground up smaller using a wooden stick in a plastic container. Th...
by OverTheTop
Fri Jun 26, 2009 9:08 am
Forum: Electronics
Topic: Surface Mount Technology (SMT) Soldering Tutorials
Replies: 13
Views: 2864

Controlling the amount of solder on the joint, especially for soic and mongrel sot23 components is made far easier with thinner solder. I would be using the 1mm tip myself, but with a careful hand for steadiness and placement, to make the joints on all but the fine pitch (0.62mm pitch and down) comp...
by OverTheTop
Thu Jun 25, 2009 9:16 am
Forum: Electronics
Topic: Surface Mount Technology (SMT) Soldering Tutorials
Replies: 13
Views: 2864

Solder bridging can be reduced by using thinner solder and keeping the right amount applied to the pins. The thinner the better I find (I normally use 0.35mm). I just saw the other day there is now 0.1mm solder! I might have to get some to try out. Chip components flying across the room reduce with ...
by OverTheTop
Wed Jun 24, 2009 6:08 pm
Forum: Electronics
Topic: Surface Mount Technology (SMT) Soldering Tutorials
Replies: 13
Views: 2864

I agree with PK completely. SOIC and QFP packages are pretty straight-forward (even fine-pitch with a steady hand and fine tip!). Anything with a lead that goes under (or is under) the device is more problematic. As for soldering, remember solder follows three things; Heat Flux Other solder Use flux...
by OverTheTop
Wed Jun 24, 2009 1:18 pm
Forum: Electronics
Topic: Surface Mount Technology (SMT) Soldering Tutorials
Replies: 13
Views: 2864

One of the biggest skills I have found in SMT technique is TWEEZER SKILLS. If you are clumsy with tweezers, boy are you going to have some "fun" as you improve! It's not hard, just persist and things get better.... As someone mentioned in a previous post, there are tweezers that are normal...
by OverTheTop
Wed Jun 24, 2009 10:53 am
Forum: Electronics
Topic: Surface Mount Technology (SMT) Soldering Tutorials
Replies: 13
Views: 2864

I can remember back before the 70's, to tagstrip construction, wax-coated capacitors, big resistors, and TVs with vacuum tubes, even though I was only quite young. I can remember Dad changing the tubes in the TV when it stopped working. I love pushing things smaller in the electronics game. Challeng...
by OverTheTop
Mon Jun 22, 2009 5:43 pm
Forum: Electronics
Topic: GPS Telemetry project
Replies: 297
Views: 40527

Less vibration for the electronics is better. ALL solder joints have a finite life. Given the small amount of use the telemetry is probably going to get (low duty-cycle), and that it is not "mission critical", I wouldn't go overboard. I note that most of the Sparkfun GPS units are lead-fre...
by OverTheTop
Wed Jun 17, 2009 9:43 pm
Forum: MMRG
Topic: Next Melbourne launch
Replies: 869
Views: 106442

Sorry to say I won't be able to make it this weekend.

May your flights be long and recovery walks short...
by OverTheTop
Tue Jun 16, 2009 9:44 pm
Forum: How's the Weather..?
Topic: When rockets goes wrong...
Replies: 41
Views: 5252

Somewhere there is probably a label on this rocket: "Made in China"

[url]http://www.youtube.com/watch?v=8_EnrVf9u8s
by OverTheTop
Tue Jun 16, 2009 11:50 am
Forum: How to's
Topic: MPR Shock Cords
Replies: 29
Views: 5236

I like the idea of the MAD myself (I've designed and built a simple one, on another thread) because, as well as deploying at apogee, if the rocket goes unstable it pops the nose when it starts heading for the ground. This should make for a safer launch I think. Now I have got some black powder (afte...
by OverTheTop
Fri Jun 12, 2009 9:07 pm
Forum: Electronics
Topic: How to De-Solder
Replies: 10
Views: 2579

What a great way to desolder! Sounds like it would work well, but watch out for the solder balls that form when the liquid solder is blown (safety glasses are a must) as they can cause shorts. The high volume of air would cool the joint nicely.

Good work. Nice improvisation.

:D

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