Questions tagged [lamp]
The lamp tag has no usage guidance.
143 questions
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Can a power cord running through a metal fitting induce voltage?
When I dug out an old floor lamp, I decided to run some basic "safety" checks using a multimeter. To my surprise I measured some voltage on the lamp post and I believe that this voltage is ...
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Altering rotary dimmer to have more range of motion while maintaining values? [closed]
I'm making a lamp right now and the vision is to have a dimmable lamp in which there are two strings controlling to the potentiometer. To increase the brightness, one string is pulled down and the ...
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Can I power a 12v pea bulb with a 9v battery?
I am trying to power some dolls house lighting. It is essentially a series of 3 x 12v pea bulbs. I have found that they work with two AA batteries (1.5v) but only lasts for about 3 hours. Would a 9v ...
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What is needed to power a OSRAM DULUX S 11W/827
If I want to light an OSRAM DULUX S 11W/827 lamp, what I need?
I found some information here:
Nominal voltage: 91V
Nominal current: 0.16A
but since it is a ...
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Double envelope bulbs
I have a lamp with the following reference:
Bulb 1000W/220V E40 HALOGEN Double Envelope
What they means by Double Envelope in the reference?
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Voltage drop of each load in the radial network
How do you find the voltage drop and external loop impedance of each lighting load in the picture attached?
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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
...
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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 ...
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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 ...
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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
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 (...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 (...
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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 ...
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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 ...
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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 ...
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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 ...
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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,...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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