Electronics > Projects, Designs, and Technical Stuff
Batteroo testing
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FrankBuss:

--- Quote from: ez24 on December 21, 2016, 02:30:06 am ---I like the train better and hope you will do it first. If you are not doing video you could take a dozen or so pictures (if the wheels do not wear out).

 I think the best use of these things will be in toys and these things will sell very well next Christmas at toy stores (if they work)

--- End quote ---

I'll do both tests. But the train will run for some hours (I'll record it full time on video), so meanwhile I can use the second sleeve for the in-depth tests.

Modified setup idea

ez24:

--- Quote from: FrankBuss on December 21, 2016, 03:30:18 am ---I'll do both tests. But the train will run for some hours (I'll record it full time on video), so meanwhile I can use the second sleeve for the in-depth tests.


--- End quote ---

When is the ETA?  ie how many hours left
Luminax:

--- Quote from: amspire on December 20, 2016, 03:05:37 pm ---Here is 15 minutes effort with Polymorph plastic. I used the top of a small fuse as the anode extender.

Beats 3D printing any day for speed.  :)

This is my Batteriser friendly design. It is actually very strong and grips the battery firmly. it wasn't quite set in these photos - it gets whiter after an hour or so.





--- End quote ---

Wow... did you just make your own "Batteroo Sleeve"? brilliant!

That aside, are we tracking types/brands of batteries used? Just wondering
McBryce:
@FrankBuss: According to your tracking details, we must be almost neighbours. I have some Arcol HS25 R1 J (0.1ohm +/- 5% 25W) shunts here which you can pick up any time if they are useful for your tests.

McBryce.

FrankBuss:

--- Quote from: McBryce on December 21, 2016, 12:51:00 pm ---@FrankBuss: According to your tracking details, we must be almost neighbours. I have some Arcol HS25 R1 J (0.1ohm +/- 5% 25W) shunts here which you can pick up any time if they are useful for your tests.

--- End quote ---
Nice, but my resistor should work, because it doesn't get warm, so the measured reference value should be valid for my tests.

I got the two Batteroo sleeves and started testing with the train with normal batteries and trying to measure the other sleeve. Needs a bit longer, because my electronic load had an error of more than 5 mA in constant current mode. So I tried to calibrate it as described here. Thought I could just calibrate the low current values, because I can't generate 25 A. But now it doesn't work at all anymore. When I set 1 A, it draws max current, when I set 0.9 A it draws no current etc.

But no worries, I modified my test setup a bit: The unused op-amp of the TL084 is now used to control an IRF540 FET I found in my parts bin, in a circuit as described in EEVblog #102. I had to increase the symmetrical voltage of the op-amp to +/-10 V for high enough gate voltage and had to use another power supply for the constant voltages, so that I can now use the second channel of my SPD3303D to control the op-amp (with a 1:10 resistor divider, for higher resolution) , which controls the FET for the desired current. The first channel will be used to simulate different input voltages. Looks like it is working, up to 4 A is no problem, now writing the scripts :phew:
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