upgraded FETs - Page 25

mod_o_matic · #**361** 11-07-2004, 09:34 PM

10V to fully open..man, i dont know how i can amplify it.. is there any other way to do this easier? I cant stack fets now due to the fact after testing my fet set up i put superglue ove the IC5 and IC6 contacts...Is there smaller version of FETS or something...

Jshwaa · #**362** 11-07-2004, 10:21 PM

Vishay SI-4562DY and International Rectifier IRF7389.

mod_o_matic · #**363** 11-08-2004, 01:12 PM

So, if i use the IRF7389, all i have to do is get 2 (or stack 2= 2x2?) and have the signal wires in the same places? Then the the othere pins postive and negative from power source?

Jshwaa · #**364** 11-08-2004, 08:38 PM

Quote:

So, if i use the IRF7389, all i have to do is get 2 (or stack 2= 2x2?) and have the signal wires in the same places? Then the the othere pins postive and negative from power source?

Ok, you lost me....

Are you wanting to build an external board or are you wanting to stack FET's where your stock FET's are presently installed?

mod_o_matic · #**365** 11-09-2004, 05:04 PM

NVM...heh..

Ok, LAST QUESTION: If i only wanted a foward controle, could i just use two large fets on IC5 (or is it IC6)?? I just have to cut out two fets from the circut?

Jshwaa · #**366** 11-09-2004, 06:21 PM

Quote:

Ok, LAST QUESTION: If i only wanted a foward controle, could i just use two large fets on IC5 (or is it IC6)?? I just have to cut out two fets from the circut?

You could technically cut out 3 of them and just have one power transistor turn the motor on/off at different speeds. Very possible, yes.

mod_o_matic · #**367** 11-09-2004, 06:57 PM

huh? please explain that...

Jshwaa · #**368** 11-09-2004, 08:30 PM

If you only wanted the motor to go one direction, then you could just tie an N-channel drain to VCC, the source to the pos. terminal of the motor, and the neg. terminal of the motor to ground. You could vary the speed by varying your PWM to the gate.

If you wanted the motor to go in two directions, and multiple speeds, that's where you need to encorporate 4 transistors in an H-bridge arrangement.

I suggest you check this thread out for a good amount of info on H-bridges in general, and as applied to xmods. It has various links therein, which has a wealth of info on what an H-bridge is and how it works. Saves me alot of typing.

Also, check these sites.

http://www.dprg.org/tutorials/1998-04a/

http://www.barello.net/Papers/H-Bridge.pdf

moebrown20 · #**369** 11-13-2004, 09:47 PM

I'm having a hard time finding a place that stock IRF-4905's.
Do anyone know where (except digi-key, because their all out until mach, and thats a long way!) I could get a few of them?

moebrown20 · #**370** 11-19-2004, 02:52 PM

Ok, I placed a order today so next weekend I will build it and take some pics when complete.

moebrown20 · #**371** 12-01-2004, 07:21 PM

Ok, I got the parts, installed everything, added a regulator & 2 lithiums & my cheetah-X 130 motor. The result.......... 82km. Not bad. I need to add bearings to the motor and 2 more lithiums for a better run time. The turbo is bulky now, hope to trim it down a bit to save weight and space. I'm looking to top out around 94 or so. Did you know the speed checker max out at 99? After that it says "error". I need a new way to test motor and turbos.

spitty12 · #**372** 12-08-2004, 01:56 AM

This place is a ghost town

moebrown20 · #**373** 12-08-2004, 01:03 PM

When I drive around with this turbo setup, my fets gets hot just after 3 or 4 minutes, does this happen to anyone else?

aaron · #**374** 01-07-2005, 01:32 AM

You can now do better than IRF7389 by using IRF7317 which give an internal resistance slightly button than SI4562DY..

'Bout USD20 delivered for 10 of them!

A.

tinyrc · #**375** 01-07-2005, 02:27 PM

A, can you explain your math for the figures you posted - I'm not getting anything like the same numbers you got for that chip vs. the 4562. I didn't want to say anything on your site, but, it just seems like your numbers are wrong - please show me how you got them? Thanks!