Questions tagged [lamp]

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Using EU LED lamp in USA [closed]

I live in the US but recently purchased a European LED lamp intending to rewire it to US standards. When the lamp arrived, I noticed that the end of the power chord said the following: LED DRIVER ...
sac1234's user avatar
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0 answers
142 views

What analog component(s) can I replace a relay with

I'm extremely new to electronics and have a college group project to build a traffic light using only analog components (ICs are allowed), my subsection is to design and build the driver unit and a ...
OR13N 's user avatar
0 votes
1 answer
43 views

Can I use 3.7V battery on a 3.5v rated halogen lamp?

I have a retinoscope that is 3.5v rated and I am searching for battery replacement, the batter I am getting is a 3.7v li-on and the battery which is used in the retinoscope is 3.5v ni-cd, can I use ...
Arsh Ali's user avatar
0 votes
2 answers
111 views

IC BP9916C Block Diagram

Could you explain the functioning of each block in the IC BP9916C block diagram? datasheet :https://datasheetspdf.com/mobile/1086203/BPS/BP9916C/1
Levon's user avatar
  • 39
1 vote
1 answer
66 views

Problem solving faulty sodium bulb circuit

We have lab equipment at work with a sodium bulb. The bulb is getting power but does not illuminate. Just a small glow. Can somebody point to a possible cause of the problem? Or even just give me the ...
Ashley Reid's user avatar
0 votes
0 answers
67 views

Portable Lamp Circuit

I would like to create a faulty circuit board for a portable light lamp. The original circuit board of the light lamp has a slightly different configuration. Here, pressing a button can turn on the ...
wihaHeuer's user avatar
1 vote
4 answers
152 views

Bypass circuit for 6.6A AC lamps

I'm developing a circuit project to bypass the current of several lamps in series in case one of them burns out. Initially, my idea was to put a resistor in parallel with the bulb, so that when the ...
Rafael Gabriel's user avatar
0 votes
1 answer
148 views

Adding a charging lamp indicator to an alternator not having a connection for it

I have this car alternator wired as follows: So it's connections are: B+ output for charging the battery, one brush to the regulator sense wire (exciter), and the other brush to ground. Is it ...
Aram Alvarez's user avatar
0 votes
1 answer
62 views

Using a Larger MFD Capacitor with a UV Lamp Ballast

I am attempting to repair a UV lamp for curing resins and epoxies. I determined the capacitor was the problem and ordered a replacement (7C100M33R). I got the last one the site had available - and ...
gban's user avatar
  • 3
0 votes
0 answers
60 views

Why does my power supply circuit not function correctly when connected to a load circuit?

My transformerless power supply on the left side of the voltmeter outputs 24V/12V until I connect it to my load circuit on the right. The voltage coming out becomes and stays at 1.5 V at most and I ...
batekoi's user avatar
52 votes
4 answers
4k views

What are the little bits of metal that come out of light bulb filaments and why do they stick to only one terminal?

Recently I changed the headlights in my car and took a few micrographs of the filaments. A couple composite photos of old bulbs: For reference, here's a new bulb filament: On the left wire in the ...
rsaxvc's user avatar
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1 answer
72 views

Constant voltage for an LED lamp DIY project

I have a couple of 12V LEDs lying around, and some old 220V to DC 12V transformers. I want to build a little portable lamp. The LEDs flicker: I guess the transformers are not delivering a constant ...
January's user avatar
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1 vote
0 answers
40 views

5 mm 12 V 5 W filament lamp

Please help to identify small filament lamp, size about 5 mm. Voltage specified as 12 V. It was mounted on the IR source. There is a little vertical metal spring (not filament, another one) inside ...
Andy's user avatar
  • 11
0 votes
1 answer
46 views

Will installing two GU10 light bulbs into 2G10 base work? [closed]

I have a 2G10 lamp base mounted into the wall with a 2G10 bulb, I want to connect it to my smart home. Will anything go wrong if I plug in two GU10 bulbs into it? Will they even fit? Didn't find much ...
Ilya Kuleshov's user avatar
0 votes
0 answers
47 views

Lamp transformer fix makes monitor shut down

I fixed a lamp transformer case (230 V to 12 V) by making a 3D printed one. I measured 12 V at the secondary coil and the lamp is working well. The thing is, when I plug the transformer to a power ...
AyubowanPro's user avatar
1 vote
3 answers
176 views

DC christmas string lights without polarity

My sister was doing an electronics project assigned from school and she was given sets of christmas light-looking bulbs in sockets with two wires sticking out of each. When she asked me for help ( it ...
chill389cc's user avatar
0 votes
3 answers
134 views

What happens if I power a 12 V LED lamp at twice its voltage with a 24 V power supply?

If I have an LED lamp which is specified as, say, 350 mA at 12 V DC, what would happen if I fed it directly from a 48 V DC constant-current power supply capable of providing up to 350 mA? I understand ...
Brandon Kellett's user avatar
2 votes
1 answer
91 views

Fluorescent lamp strands not working properly after rearranging

I salvaged some fluorescent cold-cathode fluorescent tubes from an old computer screen. In the original configuration they worked fine and produced an even light. I made a lamp out of it and for this ...
Besi's user avatar
  • 737
0 votes
1 answer
123 views

How long should I charge my headlamp to max. capacity without damaging it? [closed]

I have a headlamp that uses two 6800 mAh batteries connected in parallel. The charger that came with it operates on 4.2V / 500mA. A forum on the internet said that the time taken to charge = (battery ...
nasra404's user avatar
3 votes
3 answers
1k views

I need to test multiple lights that turn on individually using a single switch. I don't understand the use of diodes in this diagram

I have the diagram below. Wire 4 has a phase of 120VAC and N is the neutral. I need to test several lights that turn on individually each one using different contactors that are activated by sensors (...
Eduardo Vieira's user avatar
2 votes
2 answers
246 views

Driving a lamp with low-side MOSFET

I have a circuit based on 555s that flashes a 12 V, 10 W lamp. I am using an IRF540 MOSFET to drive said lamp. I have the output of the 555 (12 V) pulsing (on/off) once per second. The drain is ...
Grant Lee's user avatar
1 vote
1 answer
4k views

The LED bulb in my room has written 9 kWh/1000h on the box; what does that mean? [closed]

I bought a LED bulb for my room which uses 8.2 W power = 60 W conventional. I know this means it's a 8.2 W LED bulb which gives a brightness equivalent to a 60 W incandescent bulb. So here it says 9 ...
Muhammad Kaunain Jamil's user avatar
2 votes
0 answers
70 views

How can I modify this PCB "Solar lamp Mosquito Zapper"?

simulate this circuit – Schematic created using CircuitLab This is the PCB. This is a little schema The function is the solar cell charging the battery (2 x 1.2 V NiMH in parallel), and when ...
Carlos Chan's user avatar
2 votes
1 answer
91 views

How does 3-way lamp remember its last setting?

The Wikipedia article on 3-way lamps says that the rotary or pull-chain switch mechanically goes through all the states, if I understand correctly. However, I noticed that my floor lamp still cycles ...
mk12's user avatar
  • 255
0 votes
1 answer
81 views

What kind of LEDs are used in this lamp?

I have many of these lamps in my home. They are sold as being LED lamps, but I do not know the proper name of this particular type. Once I had one with the glass bulb broken and removed I got curious ...
G Cab's user avatar
  • 111
12 votes
5 answers
1k views

What explains this bulb/motor behavior?

My son was building circuits with a hobby kit. He tried connecting a small DC motor and incandescent bulb in series with two batteries. The motor is not marked, probably is rated at no more than 6V. ...
nuggethead's user avatar
  • 1,139
1 vote
0 answers
62 views

Exchange a battery with capacitor?

I have this 5 V lamp work with a internal-battery. I took the battery out and it work with the 5 V charge directly. But it flash/flick sometime. My idea is to put a capacitor in place of the battery ...
Joseph Tailor's user avatar
-7 votes
1 answer
111 views

I have to build an LED lamp with a lithium battery [closed]

I don't understand much about electronics, I just know that the battery is very dangerous. These are the links of the components that I will use: BATTERY 3.7V 4400mAh LED 11,9V 1050mA STEP UP BOOST ...
federica barletta's user avatar
8 votes
3 answers
2k views

Why did a spark occur between my HDMI cable and metal lamp base?

Edit: Update 1/2/22 @ 2:27 UTC: outlet tester shows that all outlets and power strip outlets being used were normal. Update 1/2/22 @ 21:07 UTC: performed various continuity tests which suggest to me ...
dfncrbl's user avatar
  • 89
4 votes
5 answers
779 views

Can I use a single LED from a 220V LED light bulb to repair my 1.5V LED flashlight?

Update: I couldn't desolder any LEDs from the donor board without destroying them. They simply refuse to come off. This raises the question for me: Are they even soldered there or manufactured as they ...
NerdyNerdie's user avatar
1 vote
1 answer
74 views

Special project elevator floor lamp

I am building a floor lamp made of vintage elevator directional lenses removed from an old hospital. The lenses are from the 50's. I want to simulate an elevator theme for this project. I have all ...
Randy Meeks's user avatar
0 votes
1 answer
267 views

Reducing the brightness of an incandescent bulb

I have an old piece of hifi equipment that has some indicator lamps on the LCD. The circuit that drives them is 28V AC. I have two 14V 115mA bulbs in series connected to this circuit. Is there any way ...
Jademalo's user avatar
  • 113
0 votes
1 answer
476 views

UV-C lamps flickering problem

I have got 8 UV-C lamps connected to a portable battery(AC) through a smartplug. I am using 4 UV Ballast with 2 lamps connected to one ballast. I am controlling the lamps with help of a wireless ...
siddharth's user avatar
-1 votes
1 answer
148 views

Switch lamp problem [closed]

I have the answer to the following problem, but I am not sure how they got it. Please explain: Four identical incandescent light bulbs L1, L2, L3, L4, and a battery are connected as shown on the ...
Rose's user avatar
  • 5
1 vote
1 answer
96 views

Touch switch for hanging lamp (touching metal bar): Ideas?

A few years ago, we have bought an IKEA Glimt hanging lamp that operates with halogen lamps. It has a "touch dim" functionality, so when a person touches the metal bar of the lamp, it dims (...
sophonet's user avatar
1 vote
2 answers
66 views

Does different bulbs in one circuit lead to shorter lifespan? [closed]

I had a conversation with my family regarding lifespans of bulbs. They claimed that they had observed that when different wattage bulbs are plugged in the same hanging light, the bulbs would die ...
N. Boumakis's user avatar
0 votes
0 answers
222 views

Issue converting halogen desk lamp to LED

I have a halogen desk lamp with a three position rocker switch with a central off position and either side representing a different dimming setting. It has a transformer with two coils connected to ...
ragtag's user avatar
  • 1
0 votes
3 answers
893 views

How to connect live and neutral and earth connection in AC devices plugged into socket?

I know that when I have a fixed lamp in my house I have to use a single switch on the live wire. But when the device is connected using a plug the live wire and the neutral wire vary depending on how ...
G M's user avatar
  • 326
0 votes
1 answer
35 views

How to simulate two 12W lightbulb in series to 220VAC?

How can I simulate two lightbulb of 12Watts in SPICE? In proteus simulation, there is only a lamp of adjustable nominal voltage and resistance. The default is 12V nominal and 24ohms resistance. If I ...
hontou_'s user avatar
  • 1,074
0 votes
3 answers
40k views

Max watt bulb for an old "660w 250v" table lamp? [closed]

I have an old table lamp that's imprinted "LEVITON / MADE IN USA / 660W 250V / LAMP HOLDER". I'm used to lamps with stickers that specifically tell me what max-watt bulbs I can use, usually 60W, 75W,...
2540625's user avatar
  • 101
0 votes
2 answers
385 views

Power consumption in watt for fluorescent lamps

I live in Egypt where the AC voltage is 220v. Yesterday i bought two fluorescent lamps (60cm and 120cm). I toke the following photos for the what is written on those lamps: Please have a look to the ...
Mostafa Mahmoud Ibrahim Mohame's user avatar
0 votes
3 answers
219 views

Covid-19: can a UV-C source be improvised from a standard mercury vapor lamp?

I suggest it because the usual professional UV-C sources are in short supply and very costly. A common 175 W mercury lamp designed for illumination includes the quartz 'lamp' tube itself, inside an ...
user216912's user avatar
1 vote
2 answers
130 views

How to check LED current

I'd like to check if a lamp shines and if it's dead, a relay is supposed to switch. I thought about using an ATtiny with a Hall sensor. There are some sites that complain about the inconcurrency of ...
Hans Meier's user avatar
9 votes
3 answers
4k views

Neon lamp symbol

I am new to neon lamps: I just discovered its electronic symbol: I am a little bit confused, What does the dot in the symbol mean? It looks like the neon lamp is polarized. How do I know what lead ...
Nau's user avatar
  • 515
1 vote
2 answers
276 views

How to convert tail light to LED?

I want to convert my tail light(Peugeot 405) to LED light.there are 5 lamp in this case. Instead of each lamp I think 6 white LEDs are enough. as you know better than me, each white LED is 3.3v and ...
Freeman's user avatar
  • 115
0 votes
2 answers
72 views

Wiring 1 lamp and 1 fan to 2 switches instead of 1

There's this setup, where I have one lamp and one fan, both are connected to one switch. I would like to add another switch to control them independently. Here's a rough schematic of what I found ...
kinji's user avatar
  • 11
-1 votes
1 answer
160 views

Zener diode identification

I need to replace the zener diode. Will the model marked in the table in the picture be correct? The marking method indicates that the diode manufacturer is: "DIODES INCORPORATED". I do not ...
008's user avatar
  • 3
2 votes
3 answers
826 views

Does lifetime of tungsten incandescent lamp shorten by every turning on, directly connecting to electric grid, and how much?

Does lifetime of tungsten incandescent lamp shorten by every turning on, directly connecting to electric grid, ie not using special device to turn it on smoothly, and how much? It was said to us in ...
qdinar's user avatar
  • 121
0 votes
1 answer
315 views

I lost a device's power adapter, what should i seek for a new power adapter? [duplicate]

i bought an expensive desk lamp from the US called Lumiy Lightsblade 1500s, i lost the power adapter, so my questions are as you are electrical engineers: 1) can i use it in israel (The standard ...
Yazan's user avatar
  • 3
1 vote
5 answers
261 views

LED lamp - connecting LEDs in parallel

I have a question about LED lamp: Quantum Board It has 16 strings of LEDs connected in parallel. Each string consist of 18 LEDs connected in series. It's supplied with constant current source (with ...
plumbum_by's user avatar