| Electronics > Projects, Designs, and Technical Stuff |
| Batteroo testing |
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| Brumby:
It hasn't been clear to me - but how many times have each of these tests been run? A single test is a very dangerous sample on which to base conclusions. I would suggest getting a pack of 6 batteries and running the train test 6 times - 3 times with a sleeve and 3 times without. |
| Brumby:
--- Quote from: 6581 on December 23, 2016, 06:56:26 am --- --- Quote from: samgab on December 23, 2016, 06:19:40 am ---The advantage of using a reed switch and magnet is that there is no physical contact to trigger the switch, so it doesn't affect the device under test. Go nuts people! --- End quote --- As long as the magnet on the DUT is kept away from motor and batteroos inductor - could affect results if too near. (I guess the effect to motor would cancel out though.) --- End quote --- Simple answer - just use a light source and a photosensitive device where the train interrupts the beam. |
| f4eru:
--- Quote ---Thought about getting two and running side-by-side but then people might complain the trains aren't identical. So will run two tests and then edit side-by-side footage with timer. Maybe add a lap counter? --- End quote --- That's not a problem : color code the locomotives, then exchange them and re-run the test, all in one shot. For the lap counting, Dave, you could use two of your huge collection of 4-bangers, and rig the "=" button to reed switches :) Then type "0+1", and if it repeats, it counts the laps. |
| Wytnucls:
Here is an attempt to identify the DC to DC converter IC (I find it unlikely that they would have developed their own IC at that price point). There are no resistors to set the output voltage, so it is probably a fixed voltage output IC (~1.5V), which usually comes in a 6 pin package. This one has 8 pins. A 2.2uF inductor usually means a switching frequency of 2MHz for similar ICs. The picture is a bit blurry, but here my best guess for the PCB topology and pin functionality: Feel free to chime in if you spotted other connections |
| IanB:
--- Quote from: Brumby on December 23, 2016, 07:03:42 am ---A single test is a very dangerous sample on which to base conclusions. I would suggest getting a pack of 6 batteries and running the train test 6 times - 3 times with a sleeve and 3 times without. --- End quote --- The number of tests for a significant result depends on the magnitude of the effect being measured. If the difference is something striking like 2:1, then only a couple of tests with a similar outcome is enough to start establishing confidence in the conclusion. |
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