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Old Sep 22, 2003, 04:53 AM
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Thanks

Would building the p-fet IRLML6402 n-fet IRLML2502 bridge like Andy mentioned on the bit rx mods page be an alternative to the op amp coil driver? Or even salvaging 2 npn/pnp h bridges from bit rxs?

I was wondering if there was a website with general beginner info on PCB layout and the differences in sizes of components.

I think I found a dip to pic adapter at Digikey.

Billy
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Old Sep 27, 2003, 06:05 AM
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I found a few sites with a little info for DIY-LRFRS.
I found a simple page about smd sizes and tips for soldering and a code book so you can figure out which device you have by the numbers.
http://www.marsport.demon.co.uk/smd/mainframe.htm


There is supposed to be some info here about sizes but I was unable to find it.
http://www.ipc.org/contentpage.asp?Pageid=4


Here is a PCB layout program I think
From the screen shots it looks as if you draw the circuit and the program will make a pcb layout.
I think it will output G code or a file that will convert to G code.

gnu electronic design automation
http://www.geda.seul.org/


I still havent figured out the packages I should get.
Is this the correct one for the 12C509A -
PIC12LC509A-04I/SN SOIC 150 mil?
There is ther's also the dip 300 mil This is too big for the RX
and a DFN package not sure about DFN


Billy
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Old Sep 27, 2003, 06:33 AM
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Billy,

Info should be usefull, thanks.

If you want to keep Rx small and light, SN is right part.

Dave
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Old Sep 27, 2003, 08:15 AM
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I'm still searching at MicroChip.

Since the 16F84A is rewriteable and the rx code will work on it also I wonder if the SSOP 208 mil package is almost as lightweight as the 12C509A 150 mil ? This would be better for tinkering with the code.

The 12C509A comes in a UV eraseable package but I think it's DIP.

Billy
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Old Sep 27, 2003, 12:24 PM
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Have a close look at 12F629, you might like it.
Also 16F630, depending on the required number of pins.

Good luck.
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Old Oct 01, 2003, 08:01 PM
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Bit motor version of balsa living room flyer.
These small balsa models have proven to be very durable, hard to break. Nowhere near the strength of CF, but a fraction of the cost. Wings covered in glad wrap.

Dave
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Old Oct 02, 2003, 08:54 AM
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David

Did you get the current draw down?
Or is that a 145 I see there?
Either way what's your gear ratio, prop size,
motor resistance etc?
How does it fly?
I see you have added an airfoil also.
Nice.


Billy
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Old Oct 03, 2003, 01:26 AM
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Billy,

145 LP
approx 18:1
160mm adjustable pitch prop
yellow or orange motor, 500-600mA
6% camber
flies great

Dave
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Old Oct 03, 2003, 02:18 AM
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Couple of pcb layouts as a guide. Change to suit needs.
Almost finished drawing them up on computer, I will replace these drawings when done.

Drawings are fairly acurate. 1sq = 1mm

Cap value in uF

Dave

For Maxim charge pump
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Old Oct 03, 2003, 02:19 AM
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For LTC charge pump
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Old Oct 03, 2003, 03:20 AM
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Maxim1595 schematic
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Old Oct 03, 2003, 11:52 AM
Thats NOT indestructible
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Hi Dave.

Amazing board designs you have there !
I am yet to aquire that skill, must take lots of pratice.

Could you design one with no booster (there is a LV 12C5xx).

Thanks
Josh
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Old Oct 03, 2003, 06:55 PM
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Dave,

Thank you very much for the drawings. Just making those little boards is gonna be hard enough for me let alone designing them.

In your opinion, (or anybody else who has one!), wich would be lighter, the 200ohm coil tied directly to the PIC or winding say two 30 ohm coils with #42 wire and adding the maxim4020 to drive them like Koichi did? Making the actuaters or making the PC boards seem to be about the same level of difficulty so I'd like to do the lightest solution. Put another way, what does that op-amp weigh versus 2 times an additional 170ohms of wire? I weighed a 50 ohm length of #42 wire on my not so great scale and it came in about .2 grams. I've ordered the op-amps anyway.

Rick
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Old Oct 03, 2003, 09:40 PM
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Josh,

get that done for you.


Rick,

In process of making op-amp version. I got some 1595 and 4020 samples, three LTC charge pumps and enough of other components to make five receivers. Actuators cost me about a dollar to make. When all is said and done I think I'll be a long way in front.
I'll make sure drawing of op-amp version is ok and post it.
50ohm coils is min. for op-amp version I think.
As far as weight goes, could go either way. I couldn't easily get any thin enough pcb. So to reduce weight, I can easily delaminate pcb (single sided) with knife ply by ply untill pcb is about 0.4mm thick, then just give it a light sanding. For double sided pcb I have to join, with epoxy, two 0.4mm pieces back to back. So for 50ohm version, pcb is twice as thick, twice as much copper, through hole links and extra component. This may be slightly heavier. All things being equal (pcb), it could be a little lighter. The decission i think is whether you want more powerful actuators.
I don't use 0603 caps, bit small to work with. I like to get pcb and components ready, with a very small amount of five minute epoxy, glue parts in place, when dry solder.

Dave
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Old Oct 04, 2003, 05:59 AM
Thats NOT indestructible
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Awesome, thanks Dave.

There is one thing that I do not fully understand. Why are OP-AMPs being used, why not H-BRIDGEs?

Thanks
Josh
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