ph2t

[ph2t]

otp, do you have info/links on the type of radios use in standard hobby RF ?? you know, encoding standards, rx/tx types, etc, etc…. that sorta stuff…..

thanks,

ph2t.

[ph2t]

Quote:

ph2t, thought I’d try to help you with finding some FETS with a high current handling capability, and a low RDS on value at 4.5V.

http://www.vishay.com/mosfets/r-ds-on-lteq-10-milliohms/i-d-max-gteq-20-a/

Some examples:

SUM110P06-07L- 110A, 0.0088 ohms RDS on value at 4.5V, P channel
SUM110P04-04L- 110A, 0.0062 ohms RDS on value at 4.5V, P channel
SUM110N02-03P- 110A, 0.0052 ohms RDS on value at 4.5V, N channel
SUM110N02-03- 110A, 0.0026 ohms RDS on value at 4.5V, N channel
SUM110N03-03P- 110A, 0.0026 ohms RDS on value at 4.5V, N channel

lol, nice work. don’t see why you couldn’t use those. Their pkg’s are big though. I like to be as small as possible. The fets I’m using have stats better than those but thanks….lol….

[ph2t]

Quote:

i’m runnin a standard iwaver but with these crazy batteries i got.; when i first got the car, i wacked some grandcell rechargeables in it(never use them they the worst things ever) and it went pretty slow. it then slowed down considerably and i thought that was a bit odd. picked it up and there was smoke comin out the bottom of it.then when i used it from then on, forward was way slower than reverse, so i switched the motor terminals and changed the switch on my controller so when i pulled the trigger the car went forwards instead of backwards. then put these new batteries in it today and it went for a bit, then i hit something and it just stopped. so switched it all back to normal(all the conections etc) and was hoonin it forward but now reverse doen’t work

yeah dude, you’ve blown a mosfet….. you need to replace it to get it working all ok again….

[ph2t]

sounds like you’ve blown one of the fet pairs…. This would explain why one direction works and not the other. what were you running? an xspeed? what chassis? mr01? madforce? etc..etc….

in future please start a new thread and not hijack someone else’s….

cheers,

ph2t.

[ph2t]

Charlie, using dictionary.com will not help you with electronics 101. Use this site instead: http://www.iserv.net/~alexx/glossary.htm

and piss off while your at it.

ph2t.

[ph2t]

echo…….

your source pins are connected to the wrong terminals. review the various diagrams you have used for reference and you will see your mistake.

Charlie, I’m not going to answer your questions just because you are too lazy to search and find out for yourself. You did this to Jshwaa over at tinyrc, don’t expect to get away with it here. Grow up.

Btw, why do this diagram? Of what use is it to you?

[ph2t]

OTP. it would help if you had full schematics of the RX in the car. First thing to do is chuck a 40mhz crystal into the RX and see if it works.

Given that the RX is a crystal controlled device I believe the changes that would need to be made couldn’t just be limited to a component or two. Given that the RX is prolly setup as a PLL receiver it would be tricky to mod to suit 40mhz.

But then again, I prolly also have no idea…….

🙂

ph2t.

[ph2t]

how the hell is this meant to make things easier?

the source pins on all fets are wired to the wrong voltage rail. the pchan fets goto Vcc, the nchan fets goto GND.

ph2t.

[ph2t]

haha, mate I know what you mean. check your pm’s dude.

[ph2t]

Ok, lets bring this bugger back on to topic.:evil:

I’ve now changed the layout of the PCB to move the motor mount to one edge. This helps with the alignment when nelly is installed. I’ve made just a few (physical) improvements on the original design in terms of layout and total size.

Here’s some updated shots of the latest version of nelly.

As you can see, setup is pretty simple. Solder the 2 power wires to the +/- battery terminals. Solder the 4 (rainbow) wires to the RX pcb, two soldered per mosfet package. Then you just need to terminate the motor cables into the orange wire block and you’re good to go!

cheers,

ph2t.

Edited by – ph2t on 28 June 2004 23:09:26

[ph2t]

actual projects? about a dozen. conceptual though? hundreds…….

ph2t.

[ph2t]

KT5 seems to have alonger range. But I hate the fact that it doesn’t have the two direction switches on the top like the KT2 has.

[ph2t]

http://www.upyourarse.com

or, if that doesn’t work.

http://www.rcmart.com

[ph2t]

maybe my alloy front servo case is contributing to the front end weight, dunno…..

[ph2t]

yeah, back to the topic of vids….

I couldn’t resist, I had to do another madforce video. I like this video ’cause it was a solid outdoors experience in mud and gravel packed surfaces. In the vid you really see how well the oil shocks run.

For ages I only had oil shocks on the rear (don’t ask) and when going offroad FAST, you tend to loose it and the front end stays up in the air most of the time.

now with oil shocks, she glides on butter…..

http://users.tpg.com.au/ph2t/temp/temp_madforce.avi

Divx, 4.9MB.

yeah!

ph2t.

[ph2t]

welcome downunder Jshwaa…..

🙂

ph2t.

[ph2t]

First off, well done on the best purchase you’ll ever make, lol….. 🙂

What you must get in order of importance (we’ll my view anyways….)

kyosho bearings, don’t get crap! 🙂
3racing alloy front damper mount
kyosho oil shocks
kyosho/GPM soft foam tyre inserts

that’s the bear minimum….

as for motors, stock setup limits you to a xspeed, but they’re great motors anyways…

otherwise, I’d go a fet mod and plasma dash armature in a bb can.

cheers,

ph2t.

[ph2t]

Z, interesting man, thanks for the info. The main app for the finfets is size. The mass production of these fets would end up in top end IC/Processor design, not power mosfets. But hey! I dig brutha, I dig…..

hnm738, lemme check out the spec on the fets you have and I’ll let you know tomorrow. Gotta crash now, got a 7:45am meeting to attend tomorrow…. arghhhh, bloody management meetings…..

ph2t.

[ph2t]

don’t waste your time with that mod…….
If you’re going to the trouble of doing that, use the fets I mentioned at the begining of this thread, they offer way better performance.

ph2t.

[ph2t]

you haven’t put the wheels on too tight have you?

[ph2t]

yea, I’m sure he’s a busy busy boy….. 🙂

[ph2t]

Servo gears do fit! I put an iwaver servo gear into my mr01. Don’t ask why! argh…..

ph2t.

[ph2t]

Quote:

………….. Maybe I can triple stack those. I’m putting them in the car with a 3.7 volt li-poly batt, so I should have plenty of juice for them.

you’re an absolute nutter hachi!

🙂

ph2t.

[ph2t]

Quote:

………….. Reminds me Jamie, you and I need to have a PM discusison about an idea of mine 😉

A.

I want in! Whatever it is!

:p

[ph2t]

the one with all n-chan fets will be faster. the p-chans are prolly the IRLML6401 model that isn’t as efficient as the IRLML2502 (nchan).

speed difference will be minimal though. torque on the other hand…………

ph2t.

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