Questions tagged [transformerless]
Transformerless power supplies produce a low voltage from AC mains without using any kind of transformer and without providing any safety isolation.
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Glue gun series dropping capacitor
I have a 40 W on label glue gun for 230 V socket, PTC element could be 20 W as some manufacturers use 20 W instead and label it as 40W .
I want to add a voltage dropping capacitor to increase its ...
user275107
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What’s the explanation on why the outlets wires are on the same coils?
Working on fixing a once upon a time good soldering station so I thought.
Inside the soldering station there’s two transformers, first one for the soldering iron that has an primary of 115 V 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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Do voltage multiplier circuits and transformerless power supplies have functional similarity? [closed]
I saw diagrams of voltage multipliers like in the picture below. To my understanding, it seems like they have the same function as transformerless but the use of a voltage multiplier is to increase ...
user320546
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Confusion about DC output voltage in this circuit
I am building a transformerless power supply to power 60 RGB color changing 2 pin LEDs in series from 230 VAC mains. These LEDs need DC to function properly.
In the circuit below, I understand that ...
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Converting 24 VAC to 5 VDC with small output current
I have a transformer which outputs 0.33 A at 24 VAC. I would like to rectify this down to 5 VDC and minimal current, 50 mA being the maximum. I came across the following schematic which seems to be ...
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Is it possible to make a 220 VAC to 12 VDC, 5 A transformerless power supply?
I need to make a power supply that takes 220 VAC and outputs 12 VDC and can handle 5 A.
Where I live there are no flyback transformers for sale and importing them is a big hassle.
I have some ideas ...
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Simple transformerless 3.7VDC to 220VAC [closed]
I am looking for a circuit design that could be capable of inverting 3.7VDC to 220 VAC. The maximum current draw is below 50 milliamps, and this circuit shouldn't have problem like voltage drop as ...
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Problem with how circuit work in china transformerless voltage sensor pilot lamp
I want to actually understand the circuit completely but for the specific, i want to really understand how this circuit can actually output ac voltage in OUTPUT_SENSOR point and the waveform is ...
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How does this "single-ended push-pull with transformerless driver" work?
I'm studying the circuit block below in an Italian textbook, "Dispositivi e circuiti elettronici", by M. Gasparini, D. Mirri.
The circuit is called "single-ended push-pull with ...
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An inverter without a transformer?
I am trying to build an inverter without a transformer. I want to use a 12 V battery connected to a boost converter which will boost the 12 V to 120 V, then simply attach an H-bridge to the 120 V ...
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Rectified 230VAC to 24VDC
I am building a simple motor control application, driving a series wound motor that runs on rectified 230VAC. Originally, it was controlled by a pendant switch connected to a 7 pin connector. The idea ...
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How to build a simple 12VDC-12VAC transformerless inverter using transistor
I am looking for a circuit diagram or an explanation on how to build a 12VDC-12VAC inverter circuit without using a transformer or an inductor of any kind.
I want this circuit to be as simple as ...
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Can we make a transformerless 220V to 12V converter without a Zener doide?
I saw many circuits have a Zener diode, but a guy from Youtube lighted up a 12V LED without a 12V Zener diode in the cicuit.
How is that?
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Capacitive dropper power supply for LED - zener/decoupling capacitor?
Let's say you have a standard capacitive dropper power supply like the following (from Wikipedia):
I understand that these work well for driving LEDs since they act like a constant current source. I ...
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