pic: How Not To Do It: Electronics Edition

[Oblarg]

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]

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]

Originally Posted by jee7s

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]

Originally Posted by Oblarg

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]

I'm diggin' the copy of Munkres in the background.

[Oblarg]

Originally Posted by compwiztobe

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.

[Aren Siekmeier]

Originally Posted by Oblarg

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.

Originally Posted by Oblarg

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]

Bang-bang speed controller Rev. 1.0

[BBray_T1296]

Now all you need is some pneumatics, and you have, well, a spike.

[Certified Nerd]

Originally Posted by rwood359

Bang-bang speed controller Rev. 1.0

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

[Zaque]

Originally Posted by Certified Nerd

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]

Originally Posted by Zaque

"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.