Questions tagged [transformer]

For questions about transformers, devices which convert alternating current from one voltage to another.

19 questions with no upvoted or accepted answers
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256 views

Extremely old doorbell transformer filled with black gunk?

I need to replace my doorbell transformer in order for my Ring video doorbell to consistently have sufficient power. After searching long and hard I finally located the transformer, which appears to ...
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0answers
57 views

How do I make my doorbell not connected to a light switch?

The transformer for my wired doorbell is connected to a light junction box. The doorbell works just fine if the light (which the transformer is connected to) is turned on using the wall switch. If the ...
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0answers
32 views

Box mounting point

What are the chances of this setup passing an inspection? 4x4 box is mounted on a stud, relay attached to the bottom 1/2 knockout, transformer will be mounted at the front of the box. This is in ...
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0answers
818 views

Replaced HVAC Transformer, still have no output voltage

My HVAC stopped working, no matter what state the thermostat is in there is no fan, no compressor, no heat, etc. Using a multimeter, I found that the output voltage on the transformer was 0V. ...
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0answers
41 views

Diagnosing doorbell transformer voltage drop

UPDATE: The plot thickens. I measured 2.5V at the door even with the wires completely disconnected from the transformer. So, the transformer is contributing to the voltage difference but not solely. ...
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0answers
42 views

Convert 120 V circuit to 12 V by splicing LED driver into existing wiring

My kitchen has a light switch by the sink which operates a pendant light above the sink. I am making a DIY replacement light using a 12 V LED strip and a 4 ft. wooden dowel to be suspended ...
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1answer
66 views

Setting up transformer for 240 down to 120

I'm using 240 for voltage drop. The load is a receptacle fed from a subpanel. I know the size of the transformer,the fusing I want to use but, need help figuring out how to ground the system. In ...
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1answer
87 views

Light and GFCI off 240v well circuit transformer

Due to costs of pulling I decided to try a used transformer as of infrequent usage of the GFCI and more of lighting. I opened the mobile home's 200 amp breaker box at the pole. It has a double breaker ...
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0answers
88 views

HVAC: Nest - Yet another 'C' wire question

I have a dual transformer system. At the AC/Blower unit, there are 'R_c', 'Y' and 'G' wires; there's 0VAC between the 'Y' and 'G' wires, and each shows 27VAC to the 'R_c' wire. At the boiler, there ...
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0answers
30 views

Tried switching old thermostat with digital one…wasn't working, so switched it back to old one and ir is still not working

I decided to upgrade the old thermostat control for heating/cooling, to a simple non-programmable digital unit. I simply attached the wires to the corresponding terminals in the new unit. After ...
0
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1answer
87 views

South Africa - Helping a layman with connecting multiple strings of lights on one plug

How would I connect 10 x light strings (20 lamps x 3v/0.06w) to one plug the transformers that come with the light sets are Input: 230-240Va.c 50Hz Output: 24Vac 6va Can I just get a bigger ...
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1answer
84 views

'plug-in sequence'

Good Day, I am thinking the opposite from this last entry (JM) but have no background in electrical theory. I have a lot of appliances I plug/unplug w/a little box in-line (I assume "transformer"). ...
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0answers
455 views

Doorbell button wire low or no voltage

I have existing wiring for my doorbell that goes from the front door to a closet. No actual doorbell or chime is hooked up, just wiring. When I connect a 24v transformer to the closet end, I'm ...
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0answers
29 views

How well will a machine rated for 120 volts 60 hz work with 120 volts 50 hz?

Moving oversea wanting to know how well my Zaaz Vibration Platform Fitness Machine will work with a transformer that will step down 220 volts to 120 volts with 50hz?
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26 views

a non working single 10W MR16 in a recessed light (LED)

One of the bulbs is not lighting up. I tried a new bulb and replaced the ceramic bulb holder and that did not help. What am I missing? Could it be a transformer that suddenly went bad? If that is the ...
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0answers
2k views

Fixing constant humming from mechanical doorbell with video doorbell ringers (ring/skybell)

We have an old house with a neat mechanical doorbell. The bell is one of the hammer/bell kinds. I've installed 2 video doorbells which have been powered by this just fine. I tried to add a 3rd but ...
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1answer
209 views

Can I reverse the function of a three-phase autotransformer?

I have one auto transformer that we used to convert 3-phase 380V to 3-phase 220V. Now I need to convert 3-phase 220V to 380V. How to use the same transformer for 3-phase 380V output? Please explain ...
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0answers
108 views

Does anyone know what this transformer block is for?

I have just moved into a new flat and mounted on the wall outside the bathroom is a white box. Inside the white box is a transformer and a circuit board. Can anyone help me identify what the purpose ...
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5answers
110 views

Why is my florescent transformer buzzing? Is it due to being the wrong voltage?

I am using 230v to 240v fluorescent light transformers for T8 36W 120 cm fluorescent tubes, but I found that the transformers are buzzing. The buzzing should not be happening, even though it is new ...