Go to Post Team 233 cannot wait for the Florida Regional, but they have to because they have to build a robot or something first. . . - IbleedPink233 [more]
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Unread 08-09-2014, 20:29
Oblarg Oblarg is offline
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pic: How Not To Do It: Electronics Edition

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Unread 08-09-2014, 20:32
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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!
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Unread 08-09-2014, 21:13
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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.
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Unread 08-09-2014, 21:19
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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).
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Unread 08-09-2014, 21:28
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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...
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Unread 08-09-2014, 21:37
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Re: pic: How Not To Do It: Electronics Edition

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Originally Posted by jee7s View Post
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.
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Unread 08-09-2014, 21:54
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Re: pic: How Not To Do It: Electronics Edition

Quote:
Originally Posted by Oblarg View Post
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.
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Unread 08-09-2014, 22:54
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Re: pic: How Not To Do It: Electronics Edition

I'm diggin' the copy of Munkres in the background.
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Unread 08-09-2014, 23:59
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Re: pic: How Not To Do It: Electronics Edition

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Originally Posted by compwiztobe View Post
I'm diggin' the copy of Munkres in the background.
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.
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Unread 09-09-2014, 00:09
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Re: pic: How Not To Do It: Electronics Edition

Quote:
Originally Posted by Oblarg View Post
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.

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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
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Unread 09-09-2014, 00:45
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Re: pic: How Not To Do It: Electronics Edition

Bang-bang speed controller Rev. 1.0
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Unread 09-09-2014, 01:03
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Re: pic: How Not To Do It: Electronics Edition

Now all you need is some pneumatics, and you have, well, a spike.
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Unread 13-09-2014, 12:26
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Re: pic: How Not To Do It: Electronics Edition

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Originally Posted by rwood359 View Post
Bang-bang speed controller Rev. 1.0
LOL...not really a speed controller though. It's an H-bridge switch.
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Unread 13-09-2014, 13:08
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Re: pic: How Not To Do It: Electronics Edition

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Originally Posted by Certified Nerd View Post
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.
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Unread 17-09-2014, 11:25
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Re: pic: How Not To Do It: Electronics Edition

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Originally Posted by Zaque View Post
"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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