Mosfet Power for single Cell Bit´s!!!!
 

Hello People,

We developted a Mosfet modification for single Cell Bitchar´s
The car gets not much faster but the Motor has more Torque!!!

Here the complete guide how to doo it:

http://www.universalhost.de/html_bit...t_h-bridge.htm

Including a new icon. Use it!

http://www.uffschnitt.de/bit/fet_icon_1-2.gif

Great mod!
 

I recently did your dualcell h-bridge mosfet mod and all I have is reverse--Very Powerful reverse:) All my wiring is correct, can you tell me which mosfet does what in the picture on this page http://www.universalhost.de/html_bit...-bridge2_4.htm

I need to investigate the mosfet connections having to do with the 'Forward' circuit but I do not know which mosfets to investigate.

Thanks!

(I'm confused.)
 

Why do you need a different mod for single cell and dual cell cars?

Also, has anyone measured the max current available to the motor with this mod? I would like to do this mod with a dual motor mod, where it would make a HUGE difference. If my 2.6's can each draw 200mA, but a bit can only put out 275mA, that's not good. This mod is absoluely necessary with 2 motors, or else it's like 1.375 motors! :p

I wish i could do surface mount!
I need to buy a kit or something because that's great!

I really don't know why there is a different mod for the single cell, prolly has to do with amps though.

I'm just a layman messing around a dinky little rc car on wild Saturday nights. Now I need to figure out which transducer (mosfet) does what on the pcb. Do you know looking at that link I enclosed? My board looks just like it in format. unbelievable power, no idea how the single cell would behave. I just have one direction working right now. have to check my soldering, replacing those little transducers is not an easy task at all, but now I'm hooked.

Wha? All you need to do is to remove one of those black things, and that other big black thing?

xatu:
 

C'mon, you can do it too! You don't have to anything about electronics, just follow the directions!

Well, the thing is, I DO want to do it, but my chip looks like this (shen PCB) http://www.universalhost.de/html_bit...t/3platine.jpg

And, I don't know what to take out? There is something circled on that page, but there is nothing there on my PCB.

Here is a pic of my pcb.

And another:

Yea, this is really wierd.... I can figure out how to do it, and would experiment on my pcb, but I need it, for my project :p (I don't wanna wreck it!)

Whoa! I was gonna reply at the exact same time as you! It showed your three post, I hit reply, and the "Topic Review" at the bottom shows four now!
This is a waste of a post!

Here is a easier link to read, it's in English! http://www.universalhost.de/html_bit/

if all your getting is reverse, couldnt you just switch your motor wires around.. maybe im just confused here...

If you are talkin about me switchin wires, then yea, you're confused. I didn't say nothing about my motor goin in reverse.

no you didnt... but jedclampit did. he said all he had was a very powerful reverse after doing the mod.

anyway would reversing the wires on the motor reverse the direction on it or would it just not work? i cant play with mine for a few days.. so i cant test to figure it out for myself.. i would think that it would..

Yea, it would go backward... I'm just hoping that when I hardwired my motor, it didn't go on backwards... :p

Why can't you play with your cars? Not at home or somethin?

hey thanks for replying Spanky!
 

Ya my problem is that once I swapped in all the fets for the normal transducers or whatever they are, only one drive circuit works, so yes I could just swap the F and R wires, to go Forward, then I'll have no R, OK for drag racing if I don't wipe out, but sucks for putting around.

I screwed up somehow and I think its probably too much heat to one of the mosfets I swapped in whilst soldering. I don't know which one ain't working and I don't know how to diagnose it. I do have a multimeter so I'll have to figure it out with a little help.

I need to know what all the transducers (Black square things) I replaced do, and what circuit they service eh? Anyone know, Bueller....Bueller...?

Peace out

Anyone know where I can pick up a few of these fets. I wanna try this mod...thanks.

you can get the fets at www.digikey.com

thanks jedclampit

WRX,

you'll also need a very fine soldering iron tip, good forceps or tweezer and perhaps a magnifying glass to see if connections are good. Also beware that you can't hold heat on the contacts of those little buggers very long, that may be why I wasn't totally successful.

you may already have experience with this stuff, I didn't

Thanks for the info jedclampit. I'm thinking I'll have my brother do it for me if I can't. He's a computer engineer, so he might be able to. Also, do you know where I can get that fine of a tip? I doubt radio shack would have it...

about soldering tips, I don't know, I have the common type (25 watt) and i just stuffed the smallest tip I could find into it. Think I did get it from Radio Shock.

there must be another online shop that would have a fine soldering pencil though, mine was still too big for the job and I think I overcooked a few of those little suckers.

cool to finally see someone else finally interested in doing this. It can get confusing if you don't have the exact same pcb layout as those German's have in the picture but I'm sure you and your bro can figure it out. I did the dual cell mosfet and was stoked to see how many more amps got through, just never really persevered, only got one direction to work and i need both directions for the way I drive.

the other thing I concluded about the dual cell is--who needs more power? just adding the second battery gave me all the pow pow I could handle. Are you doing the single cell mosfet mod or the dual cell? Interested to find out how your project goes, let me know!

I'm doing single cell. I have a car that I hacked a lot of plastic off of so it's really light and I want to see how fast I can make a single cell go.

the fet mod will give you torque or acceleration not really additional speed, but hey, acceleration is kick @$$ too

peace out