Unknown circuit

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uranium

New Member
Hello
I've found a circuit and I have not the tools and not enough knowledge to demermine what is it.

Here is a picture from the circuit and, what I guess, the "blue print" of it. Notice there is a part capacitor missing, but it was like this when i unscrew it from the system.

The blue capacitors are "sec 222M SE 250V~X1 Y1 400V~C". The green one has nothing on it written and the coil has "884193 TWI 0335" but didn't find the real specs.

If there is someone is able figure out what it is, feel free to post
 

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It's simply a mains filter, the extra capacitor will be fitted in countries where the mains is even worse.
 
Manuf such as Corcom and other manuf make these L/C mains filters for Industrial uses etc.
They are sometimes included in the input to a PC P.S. etc.
Max.
 
Ok thanks!

So it won't help me if i connect this to a speacker? It's main goal is to reduce de noise ? (from what i've read)
 
Last edited:
uranium said:
Ok thanks!

So it won't help me if i connect this to a speacker? It's main goal is to reduce de noise ? (from what i've read)
Click to expand...

It would make no improvement, and could well decrease power, and limit frequency response - you DON'T use them with speakers.

It's to reduce the levels of mains borne noise entering the device, and also to reduce possible noise FROM the device going out down the mains as well.

A common use in in microwave ovens, where it's more to prevent noise going out than coming in.
 
Thank you for all theses precisions

Learning everyday I'm still going to keep it, if the other oven crashes! (Mhééé Nope xD )

Have a nice day/night
 
That is a RFI filter that goes between the AC line and a cheaply-made Asian consumer-electonics that contains a switching power supply. Its job is to fix the problem created by the crappy Asian Electronics Manufacturer that left the required RFI filter out of their product so they can sell their piece of crap $2 cheaper than a better-made competitor...
 

The board referred to in this thread is not an after market accessory to fix a bad product. It is the necessary RFI filter in a (probably) properly designed product.
 
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