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Old 12-07-2012, 01:52 PM #161
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Default Re: The E-drive (V3) + PDF

Jared,

could you shed some light on it? I haven't received the package yet so I can't do any testing, but I'm curious as to why this might happen.

Thank you


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Old 12-07-2012, 02:02 PM #162
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Default Re: The E-drive (V3) + PDF

Well, I'll reveal the process how to figure current for it.

In the op amp I'm using there is a 1k ohm resistor. Literally INSIDE of it, so it removes the need for an external one.

Now, anyway, to figure gain, there is another resistor that is placed on the op amp's output, in series with the potentiometer.

Thr resistor should be 12k ohms. Meaning when the pot is set to zero, or around it, the gain should be 12.

The voltage reference of the IC is 500 mV. To figure sense voltage divide 500 by 12.

500 / 12 is 41.666 mV of sense voltage.

Now I = E/R, correct?

So, 0.041.66 / 0.015 ohms (that's the sense resistor's value!) and you get a max output of 2.77 amps, which allows for some leeway in terms of the pots ACTUAL value.

If the resistor was 6k, then it would just be a higher current limit set by the pot. Somewhere around 3-4 amps (the driver can't do 3-4 amps though! Max is 2.3-2.4 amps!)

I'm talking to Yob about it to see what's up.
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Old 12-09-2012, 03:46 AM #163
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Default Re: The E-drive (V3) + PDF

I have received my two drivers.

One of the drivers was heatsinked by soldering a piece of metal on to the powerpad. This used to be a BB for my old slingshot. Unfortunately I did not have a piece of copper...










Pardon my dry and dirty fingers.

The heatsinked driver was tested in the buck mode (two lithium cells) at 4 diode settings on the test load resulting in the total load of 5.5V at maximum.

When just connected the driver output is:



The maximum output that I got:


At 2.27A the heatsink of the driver became VERY HOT, very fast, so a larger body of metal would be necessary for longer operation.
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Old 12-14-2012, 05:57 PM #164
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Default Re: The E-drive (V3) + PDF

Okay, so Yob had sent me back his driver for me to poke it a bit, to figure out why it wasn't outputting the necessary current.

Reason it wasn't was most likely due to lack of heatsinking. When I connected it up to my oscilloscope, I found that it WAS starting out at 2.25 amps, but then dropped quickly as it began to overheat. So, if you want 2.25 amps, make sure you heatsink it well, otherwise you won't get the full output you desire!
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Old 02-25-2013, 06:38 AM #165
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Default Re: The E-drive (V3) + PDF

Okay everyone; as you are all fully aware, the E-drive has... Gone kind of silent for the past few months or so.

Well, I'm happy to tell you all that it is NOT dead. I can promise that. There was a slight lull in it but when they are going to be made again, it won't be in small 2-5 numbers.

Expect 20-25 per round or so, sometimes higher an sometimes lower. Another little feature I'm adding is taking away the pots that were on the previous boards, and using nicer black ones that have internal stops. That way it doesn't keep spinning!

As a result of the cost of labor for getting the boards made in larger quantities, I have to raise the price by $2.

When they come out for sale again, expect to see them for $17.99, in larger amounts.
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Old 02-25-2013, 11:06 PM #166
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Default Re: The E-drive (V3) + PDF

Great news, I was never a fan of the pots without stops.
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Old 07-09-2013, 02:20 PM #167
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Default Re: The E-drive (V3) + PDF

Jared,

How are things in the driver world?

Igor
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Old 07-09-2013, 11:30 PM #168
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Default Re: The E-drive (V3) + PDF

I've been wondering what happened to this one.

Its the most promising solution to what everyone wants.
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Old 07-10-2013, 02:12 AM #169
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Default Re: The E-drive (V3) + PDF

It was until nearly everyone down'd it for being new and not "established" like the flex drive.
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Old 07-10-2013, 02:30 AM #170
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Default Re: The E-drive (V3) + PDF

Who ever downed it?

Jared we would all love an update!
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Old 07-10-2013, 12:02 PM #171
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Default Re: The E-drive (V3) + PDF

Here

What the Flex?!
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Old 07-10-2013, 08:46 PM #172
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Default Re: The E-drive (V3) + PDF

Basically, the conclusion was that there were not enough made and distributed and reviewed. That was the final step.

I thought he was planning on a large production run or something. He just needs to get them out there.
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Old 07-10-2013, 10:09 PM #173
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Default Re: The E-drive (V3) + PDF

Oh, I hadnt seen that thread.

Hopefully jared just got busy with school and will be coming back to it not letting it die.
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Old 07-10-2013, 10:12 PM #174
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Default Re: The E-drive (V3) + PDF

They would be used a lot more if they went open source.
That way people could check the design as well.
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Old 07-10-2013, 10:44 PM #175
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Default Re: The E-drive (V3) + PDF

are these for sale ??? wouldn't mind a couple
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Old 07-10-2013, 11:05 PM #176
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Default Re: The E-drive (V3) + PDF

Quote:
Originally Posted by ARG View Post
They would be used a lot more if they went open source.
That way people could check the design as well.
Definitely! I am always in support of more open source drivers.

Has anybody emailed him? He might not be getting the notifications. I should have his email somewhere.
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