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Oblarg 08-09-2014 20:29

pic: How Not To Do It: Electronics Edition
 

billbo911 08-09-2014 20:32

Re: pic: How Not To Do It: Electronics Edition
 
Not too disturbing, if used properly.

It is a great visual example of how an H-Bridge works. Granted there is no speed regulation with it, but with the proper motor and gearing, it is perfect!

Besides, the spark show would be quite an attention getter!

Richard Wallace 08-09-2014 21:13

Re: pic: How Not To Do It: Electronics Edition
 
I like this!

Control of dc motors is based on ideas from the 19th century. The device pictured is a double-pole, double-throw "knife" switch, made somewhat famous by its appearances in several movie re-creations of Dr. Frankenstein's laboratory.

An FRC speed controller is just a switch like this, improved so that it can be thrown back and forth very rapidly without wearing out, heating up, taking up a lot of space, or requiring much effort.

Oblarg 08-09-2014 21:19

Re: pic: How Not To Do It: Electronics Edition
 
Just to clarify, I think the idea of building macro-scale demonstration pieces is great. What bugs me is the utter lack of insulation on pretty much everything (seriously, it'd be almost impossible to touch the actual 'switch' part of this assembly without shocking yourself).

jee7s 08-09-2014 21:28

Re: pic: How Not To Do It: Electronics Edition
 
How would one shock themselves if the demo is for a standard FRC motor and battery? Unless there's a lot of saltwater involved, its unlikely you'll feel anything.

Now, protecting the battery from shorts is a whole different concern...

Oblarg 08-09-2014 21:37

Re: pic: How Not To Do It: Electronics Edition
 
Quote:

Originally Posted by jee7s (Post 1399427)
How would one shock themselves if the demo is for a standard FRC motor and battery? Unless there's a lot of saltwater involved, its unlikely you'll feel anything.

Now, protecting the battery from shorts is a whole different concern...

Ever had a cut on your finger? Especially when working in a shop?

Yes, it's only a 12V battery, but that doesn't mean it's not extremely bad practice to have massive pieces of exposed circuitry.

BitTwiddler 08-09-2014 21:54

Re: pic: How Not To Do It: Electronics Edition
 
Quote:

Originally Posted by Oblarg (Post 1399429)
Ever had a cut on your finger? Especially when working in a shop?

Yes, it's only a 12V battery, but that doesn't mean it's not extremely bad practice to have massive pieces of exposed circuitry.

I suspect that the counter EMF from the motor could tickle your insides.

Aren Siekmeier 08-09-2014 22:54

Re: pic: How Not To Do It: Electronics Edition
 
I'm diggin' the copy of Munkres in the background. :cool:

Oblarg 08-09-2014 23:59

Re: pic: How Not To Do It: Electronics Edition
 
Quote:

Originally Posted by compwiztobe (Post 1399439)
I'm diggin' the copy of Munkres in the background. :cool:

Hah, was wondering if anyone would recognize it, though to be honest it wasn't my favorite math text. It wasn't bad, but a lot of the early point set proofs which ought to have been done in rigor consisted of just pictures and handwaving (claiming "we can construct a homeomorphism" but never actually demonstrating one, etc).

I still keep it around, though, for want of any other good references for point-set topology.

Aren Siekmeier 09-09-2014 00:09

Re: pic: How Not To Do It: Electronics Edition
 
Quote:

Originally Posted by Oblarg (Post 1399451)
Hah, was wondering if anyone would recognize it, though to be honest it wasn't my favorite math text. It wasn't bad, but a lot of the early point set proofs which ought to have been done in rigor consisted of just pictures and handwaving (claiming "we can construct a homeomorphism" but never actually demonstrating one, etc).

That's Munkres. Even later "proofs" on covering sets and homotopy are fuzzy. Working through his "Elements of Algebraic Topology" presents similar frustrations. He works on intuition.

Quote:

Originally Posted by Oblarg (Post 1399451)
I still keep it around, though, for want of any other good references for point-set topology.

And cuz it's a nice looking book ;)

rwood359 09-09-2014 00:45

Re: pic: How Not To Do It: Electronics Edition
 
Bang-bang speed controller Rev. 1.0

BBray_T1296 09-09-2014 01:03

Re: pic: How Not To Do It: Electronics Edition
 
Now all you need is some pneumatics, and you have, well, a spike.

Certified Nerd 13-09-2014 12:26

Re: pic: How Not To Do It: Electronics Edition
 
Quote:

Originally Posted by rwood359 (Post 1399457)
Bang-bang speed controller Rev. 1.0

LOL...not really a speed controller though. It's an H-bridge switch.

Zaque 13-09-2014 13:08

Re: pic: How Not To Do It: Electronics Edition
 
Quote:

Originally Posted by Certified Nerd (Post 1399954)
LOL...not really a speed controller though. It's an H-bridge switch.

"Bang-bang speed controller" is just another name for an h-bridge.

DampRobot 17-09-2014 11:25

Re: pic: How Not To Do It: Electronics Edition
 
Quote:

Originally Posted by Zaque (Post 1399955)
"Bang-bang speed controller" is just another name for an h-bridge.

Technically, you don't need an H-bridge for a bang bang speed controller, just a single on/off switch. But yes, you're right.

My favorite part of this is the huge gauge wire on the battery leads and the tiny gauge everywhere else.


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