Tagged Questions
10
votes
1answer
210 views
Is this LED fixture safe for use with its current fabrication?
My father is currently interested in investing into a Ukrainian LED fixture manufacturer, and after he bought home a sample, I'm scared. There are 94 LEDs paired up with diodes, all in series, ...
1
vote
2answers
141 views
Reflow oven AC cable splicing insulation and thermocouple readings
I'm building a reflow oven. I know what I'm doing, I just want to verify my plans to make sure I'm not doing anything stupid before I start.
The idea is to have an arduino (powered externally) ...
4
votes
1answer
584 views
AC->DC supply, how to deal with chassis ground being connected to digital ground?
I have an external triple-output AC-DC supply with the following output pinout:
On the power supply, "ground" (pin 2) is internally connected to the ground wire of the mains plug. I'll refer to it ...
0
votes
2answers
656 views
Connecting AC wires to a PCB
I am working on a project where I am using a microcontroller to control a 5V DC relay to control a mains device (an airconditioner).
In this circuit, I would need to connect the AC wires to my PCB ...
4
votes
3answers
794 views
Why is power supply from electrical utility referenced to earth?
In response to the question Basic Training for working with 120V AC zebonaut had replied that "A regular wall outlet is referenced to earth" and this provides the close loop for the circuit to ...
9
votes
4answers
585 views
Why are some AC outlets and plugs polarized?
This will show my naivety when it comes to alternating current... but why are some plugs and sockets on AC outlets polarized (one prong is taller than the other)?
(See this question on DIY.) (Or this ...
6
votes
8answers
742 views
Basic Training for working with 120V AC
I'm planning to build a digitally-controlled light dimmer circuit. I'm not trained in electrical engineering, and I don't want to do something that an electrician would immediately recognize as ...
