Thread Rating:
  • 2 Vote(s) - 4 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Show off your DIY and modified tools!
This was a really quick project to get my bulky tools and power cords off my desk:
Korishan likes this post
-Mike G
Found a use for my rejected fuse wire. I've taken advantage of the relatively high resistance to make a DIY rheostat.

Works from 50 Ohms down to about 4 Ohms. My meter reads 0.3 Ohms just across the probe wires, so I have to take that into account.
Also, twisting the wire together makes for great picture-hanging cable. Smile

I recently received some tiny potentiometers in the mail, along with the 2A glass fuses I ordered.

Gonna put these to good use.
-Mike G
Since I built that DIY rheostat, I've been wondering what the difference is between a rheostat and a potentiometer. As far as I can tell, the rheostat only has two points of contact, positive and ground. A pot on the other hand has three. The middle one being ground and the other two being positive. As the pot moves resistance increases on one positive while being reduced on the other. Is that right? Or is there more to it than that?

Anyway, the little blue pots I bought have replaced the resistors on my TP4056 charging panels.

You can see above, that I've got this one dialed in at 500mA. 

Thi pins on the pot turned out to be just the right length so I could set them flat against the panel and not need any additional wires. The closest pin got trimmed, and the unused one I just bent underneath the pot so it would be out of the way.

This was a pretty unnecessary mod, but it was fun, and will have its uses. For one thing, one of my chargers was delivering slightly more than 1A, so with these guys in place I was able to dial it back a bit. Probably not a big deal, but still kind of nice to be able to do. Also, I find when I get down to the 0V cells in a batch, I prefer to charge those individually as they tend to have more issues than the 1-3V cells do. The pot will let me limit the amps to those ones to 500mA. I like to do that with individual cells.

The other day, my cousin accused me of using my inventions to manipulate time and space. (He was joking of course.) So I made a small addition just to prove him right, LOL:

Also, I think I forgot to mention earlier, I had some of that 12V LED light strip laying around and I added some to help light up the panels. You can kind of see it just above the Opus and iMax's. Its all powered through the computer power supply. Even the flux capacitor (which does have a bit of practical value as a USB charger.) That's really the biggest benefit to the whole setup. Instead of two power strips, I now only need a single AC outlet.

I think this may finally be the last modification I make to the testing station. Unless I get some great ideas from the rest of you. Speaking of which, just about all the stuff I've made so far has been inspired by things that the rest of you have already done. I'd love to see more posts from you guys here if you're willing to share. Smile
Korishan and mormor1971 like this post
-Mike G
Very Nice... Especially the Flux Capacitor Wink
mormor1971 and Korishan like this post
******Hi My name is Jason and I have SOCD (Solar Obsessive Compulsive Disorder)*******
Current Powerwall - 1400 Cells 7s200p (modular 40p packs) ~ 12kWh of storage     4x 315W Canadian Solar Panels

Working on the next 7s40p packs     ~2.5kWh

Waiting on 2000 Cells of unused Sony vt4 (2000mah 30A) ~ 15kWh      hehehehehe  More Power
(08-17-2017, 04:46 PM)Jeremy Choy Wrote: Charging station which has temperature sensors in each bay. it will play a sound and turn red when a cell gets too hot. I've also added a current sensor so I know roughly when to go back and check.

Very cool. Can you share you technical specs on this? How did you do it. what sensors did you use? are you using arduino, can you share code?
jdeadman and mormor1971 like this post
                                ( o o )
|                                                                        |
|   Howie Grapek                        South Florida, USA               |
|   cell: 303.818.9414                  email:     |
|   phone: 561-819-9988          |
|                            .oooO                                       |
|                            (   )   Oooo.                               |
+-----------------------------\ (----(   )-------------------------------+
                               \_)    ) /

A prototype fuse tester; inspired by Average Joe.  Smile

mormor1971 likes this post
-Mike G
(10-22-2017, 01:14 PM)rebelrider.mike Wrote: A prototype fuse tester; inspired by Average Joe.  Smile

I noticed the test-board used to hold the fuses, do you know the current rating of the connections in it, can they handle the current necessary to blow the fuses?

I read somewhere that the traces weren't rated that high!
No idea what the rating is. It didn't melt, so I guess its ok, LOL.
mormor1971 likes this post
-Mike G
Also note that on the busbar you will get higher reading since it cools off the fuse wire somewhat. So for proper readings you need to solder the wire when testing Smile
mormor1971 likes this post
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
Planing a vid and needed a phone mount thing.
seems to work.

Windows phone are hard to find things for.
With saying that why are 3D printers not mandatory in every home???
Oh and plasma cutters...everyone needs a plasma cutter. Big Grin
mormor1971, rebelrider.mike, Korishan And 1 others like this post

Forum Jump:

Users browsing this thread: 1 Guest(s)