Questions tagged [light]
Light is a tag about anything generates photons in the visible spectrum
562 questions
4 votes
4 answers
251 views
Adding a pilot light in series with a relay coil?
I have a relay that operates a compressor in a separate shed. The relay coil is operated by a switch in the shop. The relay coil is 10-30vac (55mA), powered by a 24vac Xformer that is in the shed by ...
- 51
2 votes
1 answer
181 views
Two different 9W LED, with different current [closed]
I am replacing a Sylvania LED9A19 9W light bulb with an Ecosmart Model B7A19A60WUL33 9W lightbulb. I noticed that the labelled current draw for these two 9W lightbulbs are different, although they are ...
- 97
1 vote
1 answer
76 views
Multiplexer Signal Not Behaving as Intended
I'm attempting to multiplex Neopixel data with weird readings on my Oscilloscope (I'm very novice to Electrical Engineering, so maybe it's a simple fix?). Here's my set up; I have a ring of 16 ...
1 vote
2 answers
233 views
Electric signal that generates a light pulse with a response time smaller than 0.1-0.05 seconds: Can I use commercially available bulbs?
I need to run a big physical experiment. I have a first instrument connected to a fancy data acquisition system. The second instrument (optic) cannot be connected to the same system and the same clock ...
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1 vote
5 answers
269 views
How to dim an incandescent bulb - voltage divider or current divider?
Super newbie question: I have this 6V bulb powered by a 6V/3A DC wall-wart. In some applications it's too bright, but at other times I do need the full brightness. Should I dim it with voltage ...
5 votes
2 answers
691 views
Calculating the wattage of a speaker protection light bulb
I have a very old musician's singing system in my hobby room. Yesterday one of the speakers broke down. In search of the cause, I finally opened the speaker box and found two light bulbs inside. One ...
- 51
0 votes
2 answers
80 views
What quantity remains fixed when the voltage changes? [closed]
Suppose I have an electric lamp that is designed to be connected to a 220 volt network. Then I take it to a country with a 110 volt network, and connect it using an appropriate voltage converter. I ...
-1 votes
2 answers
273 views
Is it safe to charge a 4v lead battery with 5v charger and a diode?
I have bought this Chinese SMD charger light that comes with 5v usb charging port. I have just opened it to see how it charges with a 5v charger. After opening it I have been very surprised to see ...
0 votes
1 answer
113 views
Radioshack LEDs triggered by computer HDD light: how do I trigger these multi colored LEDs to change color. Grounding 3rd lead triggers them
I have purchased Radioshack LEDs, catalog 276-0016. These are a 3-lead LED package with GND, VDD and a MODE pin. Each grounding the MODE pin changes the color or operation mode of the LED. I want to ...
1 vote
4 answers
270 views
A circuit to dim an LED whenever it gets dark
I want to make a circuit to automatically control the brightness of an LED. I want the LED to be at its brightest when it is brightest outside, and to start dimming as it becomes dark outside. I was ...
- 2,980
0 votes
1 answer
75 views
Interference from ceiling fan light with my wire FM radio antenna
When I turn on my ceiling fan LED light it interferes with my FM radio wire antenna, so I used normal copper wire soldered to the wire antenna and extended to my window about 1meter long. It was ...
- 1
10 votes
2 answers
2k views
Why does my LED bulb light up dimly when I touch it? [closed]
I have a "Corn" LED light bulb very similar to this one on my bedside lamp: It is one of these salt crystal lamps: As you can see it has the salt crystal on top, then a part made of wood, ...
- 203
0 votes
1 answer
191 views
Why does TCS3200 lose accuracy when the light source is too bright?
I have a custom proof-of-concept project to detect fluid color within a PVC tube coming out of a patient's brain and turbidity (a reduction in light passing through) using an Arduino micro, a TCS3200 ...
0 votes
1 answer
74 views
What is the laser power and nm required to cut a row of paper with these specifications? [closed]
Here are my specifics. I am looking at quickly cutting a wet-paper-like material approximately 0.2 inches thick. The material stands up on its own and is separated approximately 0.33 inches apart each....
- 3
0 votes
1 answer
47 views
Can a photon be modeled using AC driven electron and AC driven wire loop?
Can a photon ("electromagnetic wave packet") be simulated in software as an electron bouncing up and down (for the oscillating E field) and a loop of electrons with neutralized electrostatic ...
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