The Jr. Professor Mr. Meg Battery Pack Builder Kit (w/pics)

**Steve** · 29th February 2008, 01:22

This is a fantastic project but I feel torn inside. On one hand I want to warn people about capacitors of this size and on the other hand I am the sort of person that giggles at people walking into road signs.

If you don't know what a cap of this capacity is capable of please learn before tinkering. Failure to take adequate precautions may well kill you.

Parker · 29th February 2008, 07:35

Quote: (Originally Posted by Steve)

This is a fantastic project but I feel torn inside. On one hand I want to warn people about capacitors of this size and on the other hand I am the sort of person that giggles at people walking into road signs.

If you don't know what a cap of this capacity is capable of please learn before tinkering. Failure to take adequate precautions may well kill you.

Hi Steve,

I understand your concerns, and you are correct, under the right conditions capacitors can be very dangerous and are capable of delivering a very painful if not lethal shock. But in this application- the caps are rated at 20/24 VDC and powered by a 12 VDC power supply. You can literally hold the bare electrodes and not feel a thing while the caps are being discharged. Not that I recommend trying it!

Parker

netmage · 15th March 2008, 01:25

Parker is da man..... He's graciously been answering my emails and pointing me in the right directions as I needed some projects to fill my idle time...

Cap Discharge Spot Welder - a photoset on Flickr

I'll work on a jig to ease assembly tomorrow and get Padipro to cut me some plywood, then it'll get mounted in the toolbox...!

Anyone in Florida need battery packs....?

-Tim

Parker · 15th March 2008, 04:40

Quote: (Originally Posted by netmage)

Anyone in Florida need battery packs....?

Oops! Forgot to mention the downside- it’s easy to get carried away and end up with more Meg battery packs than you can use in a lifetime!

I sent out a few of the Lithium AA battery packs for folks to test- hopefully we will see some feedback soon, unless they last for a long time- then it might be a while…

You might try gluing the batteries together first, before welding on the nickel strips. I use a hot glue gun- not too much tho! This helps keep everything straight and even. It also makes installing the shrink wrap at the end a breeze.

Glad the project worked out for you!

Parker

29th February 2008, 01:22	#11 (permalink)
Steve Ladies bring a plate Current Rebreather/s: Megalodon Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Classic Kiss MK 15.X Home Build Join Date: Feb 2005 Location: Perth - Australia Posts: 1,070	Re: The Jr. Professor Mr. Meg Battery Pack Builder Kit (w/pics) This is a fantastic project but I feel torn inside. On one hand I want to warn people about capacitors of this size and on the other hand I am the sort of person that giggles at people walking into road signs. If you don't know what a cap of this capacity is capable of please learn before tinkering. Failure to take adequate precautions may well kill you. __________________ WARNING: I contain occasional coarse language, extreme sexual references, nudity, and adult themes, which may offend some people - Usually churchy types.
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29th February 2008, 07:35	#12 (permalink)
Parker what bubbles? Current Rebreather/s: Megalodon Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Jun 2007 Location: USA Posts: 60	Re: The Jr. Professor Mr. Meg Battery Pack Builder Kit (w/pics) Quote: (Originally Posted by Steve) This is a fantastic project but I feel torn inside. On one hand I want to warn people about capacitors of this size and on the other hand I am the sort of person that giggles at people walking into road signs. If you don't know what a cap of this capacity is capable of please learn before tinkering. Failure to take adequate precautions may well kill you. Hi Steve, I understand your concerns, and you are correct, under the right conditions capacitors can be very dangerous and are capable of delivering a very painful if not lethal shock. But in this application- the caps are rated at 20/24 VDC and powered by a 12 VDC power supply. You can literally hold the bare electrodes and not feel a thing while the caps are being discharged. Not that I recommend trying it! Parker Last edited by Parker : 1st March 2008 at 08:58.
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15th March 2008, 01:25	#13 (permalink)
netmage Hello Kitty...... Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2005 Location: Coconut Creek, FL Posts: 354	Re: The Jr. Professor Mr. Meg Battery Pack Builder Kit (w/pics) Parker is da man..... He's graciously been answering my emails and pointing me in the right directions as I needed some projects to fill my idle time... Cap Discharge Spot Welder - a photoset on Flickr I'll work on a jig to ease assembly tomorrow and get Padipro to cut me some plywood, then it'll get mounted in the toolbox...! Anyone in Florida need battery packs....? -Tim
(Online)

15th March 2008, 04:40	#14 (permalink)
Parker what bubbles? Current Rebreather/s: Megalodon Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Jun 2007 Location: USA Posts: 60	Re: The Jr. Professor Mr. Meg Battery Pack Builder Kit (w/pics) Quote: (Originally Posted by netmage) Anyone in Florida need battery packs....? Oops! Forgot to mention the downside- it’s easy to get carried away and end up with more Meg battery packs than you can use in a lifetime! I sent out a few of the Lithium AA battery packs for folks to test- hopefully we will see some feedback soon, unless they last for a long time- then it might be a while… You might try gluing the batteries together first, before welding on the nickel strips. I use a hot glue gun- not too much tho! This helps keep everything straight and even. It also makes installing the shrink wrap at the end a breeze. Glad the project worked out for you! Parker
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