Continue to Site

Welcome to

Welcome to our site! is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Looking for circuit to convert 220V AC to 110V DC

Not open for further replies.


Junior Member level 2
Dec 28, 2001
Reaction score
Trophy points
Activity points
Need Circuit for converter 220V (AC) to 110V (DC) (no Transformator)



voltage divider 220v

Hi josquill,

For what power??


110vac to 110vdc converter


For 250 W


circuito conversor 220v a 110v



If your load have a constant 250w (+-2.5A) consumption at 110v, you can put a serial resistor, but in that case you need a resistor of 250w!!!
Definitively not a good choice.

The other way it's, make a rectifier to get a DC wave from the 220v line, and next you need to put a circuit that create a PWM wave where the fundamental wave are a 110v AC (maybe 60 HZ).
Note, in that case you must be careful with the load characteristic, if it is one AC motor, no problem, but if it is a electronic load...

Hope helps,


circuito conversor 220 vac a 110vac

Why complicates so?
Take an Phasenanschnittdimmer ( 230V Home Light Dimmer )and put back a Electric rectifier , and finishedly.
Works perfeck



220vac-110v converter+triac

i need a circuit 220v ac to 110v ac convert for audio deck
any info pls

if i put 220v in 110v what happens


May be it is easier to change the transformer inside the homedeck for a 110VAC version. That is if you did mean no external transformer off course.

how to replace amplifier 230v to 110v transformer

Need PWM circuit
Is a good idea
  • Like
Reactions: chawwa


    Points: 2
    Helpful Answer Positive Rating
transformatoare electrice 220v 110v

As already dito, the perfect way is to change the primary of mains transformer from 110 to 220V, and I know this is not expensive.
I think any other CHEAP solution will carry noise, or something else not very good.
Good luck

diy 110v converter circuit

Best way buy a transformator for audio deck.

PWM type converter expensive and dimmer circuits produce noise.

convert 220 110 2 capacitors

Hi if you want to reduce the voltage you can modulate a 220VAC rectified voltage with a sampled sinewave in a pwm mode such as in motor drive in direct sinusoidal control;you need only one micro with pwm module and for igbt with drivers (high/low side)

220v to 110v triac voltage converter

It may be worht checking the trasnformer that is alreay fitted to see if it has wto primary windings - these can be converted to 110/220 easily - wire in parallel for 110V and series for 220V.
Just a thought, as it may save you money if it is already suitable :)

110v converter circuit

One thing to check is if the transformer in your unit is rated for the power line frequency you are using. If you use a transformer at a lower frequency than it is rated for it will overheat. The suggestion of replacing the transformer with one rated for your power line parameters has the highest probability of working properly.

reduce 220v to 110v

I had exactly the same problem with a friends amplifier that came from America.
I purcased a 240 to 110 auto transformer and was able to mount it in to the amplifier box . I kept the isolation as nothing touched earth and the transformer feed strait in to the actual transformer of the amplifier I mounted it so that it was screened from the amp section.
You can buy wall plugin converters from Maplin electronics, that use thyrister swithing. they do the mains voltage conversion for you in a neat littl box.


220v to 110v dimmer

I NOT recommend a thyristor/triac converter. It good for ohmic load,and when the loading go under 50W,sometimes the output go higher as 110V.
If this converter working before a trafo,the secondary rectifier always produced higher DC voltage.
The correct way is autotransformer, or change of original trafo.

changing voltage from a 220v to 110v

Use resistance & capacitance circuit will cheaply,but not isolation.

220v to 110v voltage divider

See if this works or not

Similar to a voltage divider but replacing resistors with capacitors.
If 2 identical capacitors used, the mid-point will output 110V. I think
large capacitance will have a better performance.

But I don't know the output performance, but it's cheap.

110v pwm

you can try using a voltage divider to step-down the voltage, then fed the resulting voltage to a bridge with a suitable smoothing capacitor to get 110 V dc.

transformer wiring auto 110 to 220 vac

the simplest solution would be using a suitable transformer but if you want to use a pwm it might be more complicated as the power you want is a bit higher. As suggested before It might be a good idea to check the original transformer of the unit as it can be modified to your need of voltage.
Not open for further replies.

Part and Inventory Search

Welcome to