upgraded FETs

[LithiumXmod]

I just recieve my pnracing S03 motor today, Just finished installing the motor. I can say the upgraded Fet's are cool to the touch. The motor packs a nice punch from stop to go. Im happy with my upgraded Xmod. I will post pictures of my Xmod tonight.

[neurokinetik]

What gear ratio did you end up choosing?

[LithiumXmod]

4.80

[joe_t1g]

LithiumXmod I was considering the s03 for myself, how does it stack up against a stock stage 2? Is it a noticeable advantage to justify spending $25 on a motor?

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Neurokinetik, nice job with everything.

After hours of reading TONS of great topics by you I am finally ready to ask you a couple questions. I think I'm going to go with a Stage 2, decrease the # of turns to 44? (following your 'current draw' thread [could it be decreased any more?]), advance the timing and do a 6 cell upgrade. Probably not the fastest thing out there, but its the most cost effective at this point. This would make a 'fastER' motor at the expense of torque, so I was thinking of using SpinBrush magnets to improve the torque. 11t to balance out the speed & torque.

I wouldn't need a FET upgrade would I? I was checking your current draw findings and I estimate it would put it in the 0.60-0.70A range.

I don't want to stray off topic but what do you think of this setup? PM me if you'd rather not mix up the topic. Thanks, I've learned a lot from your posts!

[LithiumXmod]

Well, I have never used a Xmods Stage 2 motor. I went staright from a stock motor to a S03 motor. I like the motor, has a lot more punch compare to my stock motor. The neo magnets give me more torque, enough to spin my wheels. High end is great as well. Also keep in mind I don't use AA's, I use lithium photo batteries.

[LithiumXmod]

As promise, pictures.

Before

[LithiumXmod]

after:

[LithiumXmod]

another:

Has anybody else done Neurokinetik's ciruit yet?

If so could you please post more detaild Pics and or instructions on how to wire up all 4 MOSFETS together. I am having difficulty understanding the schematic. Could you post the back of the finished circuit at a bettr angel, the one that is posted is hard to determin what is what.

Thanks

Has anybody else done Neurokinetik's ciruit yet?

If so could you please post more detaild Pics and or instructions on how to wire up all 4 MOSFETS together. I am having difficulty understanding the schematic. Could you post the back of the finished circuit at a bettr angel, the one that is posted is hard to determin what is what.

Thanks

[neurokinetik]

Originally posted by joe_t1g
After hours of reading TONS of great topics by you I am finally ready to ask you a couple questions. I think I'm going to go with a Stage 2, decrease the # of turns to 44? (following your 'current draw' thread [could it be decreased any more?]), advance the timing and do a 6 cell upgrade.

I have run a similar setup to that with some success, but that was only with four cells. With six cells, the performance and current draw are completely different. Firstly, the motor is being fed more current (and voltage) by the two extra cells, and secondly the load on the motor is increased by the additional weight of the batteries. This increases current draw further. While it may be safe for the stock ESC on four cells, six cells would likely cause damage. Using an 11 tooth pinion only makes matters even worse.

Evomod,
I am also having trouble understanding this circuit. I just need to understand how the 4 new FETS are connected/wired to getter on the new board. the pictures arn't doing me any justice. Im thinking on IC6 and IC5 do you wire S1 to D1 and than S2 to D2 Im not sure whare any of the G's go

Some help from neurokinetik or LithiumXmod would be nice.

[neurokinetik]

Let me try explaining this again...

The two chips on the board, IC5, and IC6 each contain two MOSFETs. My FET mod replaces the chips with four new discrete MOSFETs that can handle more power. Each chip (shown by the pair of 8-pin devices on the diagram above) contains an N Channel MOSFET and a P Channel MOSFET. In my mod, the N Channel FETs will be IRL3705N, and the P Channel will be IRF4905. Hence, each A1792 on the board will be replaced by a pair of FETS, one IRL3705N, and one IRF4905.

A MOSFET has three connections: The (G)ate (G), the (S)ource, and the (D)rain. The gate controls the switching of the FET, whether it be on or off. The source is the voltage that will be passed through the FET, to the drain. The illustration the the left shows a TO-220 type MOSFET package, and the gate, source and drain pins are all labelled. Note that the heatsink tab on the FET is also connected to the drain. That tab and the center pin are the same connection.

With my mod, all you are doing is replacing the two chips with four MOSFETs. In the diagram above, you can see IC5 and IC6 as they are situated on the board. Simply connect the corresponding pins of the IRL3705Ns to where the N Channel FETs wired, and the IRF4905s to where the P Channel FETs were wired. The gates connect to the gates, the sources connect to the sources, and the drains connect to the drains.

Now, in the chips, the drain of the N Channel FET is connected to the drain of the P Channel FET. Do the same with the pair of FETs representing IC5 and IC6. The drains are the outputs of the FETs, and therefore, they get connected to the motor wires.

Don't get confused by what is shown inside the chips. That is simply the way MOSFETs are drawn. Just pay attention to what the PINs are on the chips, and note that S1 and G1 are for the N Channel FET, and S2 and G2 are for the P Channel FET.

When looking at the chips, and reading the text on top, pin 1 will be to the lower left. There should be a small dimple on the chip there as well.

[TypeZer0]

hmm, have you thoguht about connecting the source directly to the battery? would probably give you slightly less of a voltage drop

Is this what you are saying?

http://www.geocities.com/mangolinux/