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i want to use a circuit or device instead of transformer

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hamid.abbaszadeh

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hi all
i want to use a circuit or device istead of transformer in follow:
help me
48_1337000147.jpg
 

etmabreu

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Re: i want to use a circuit or device istead of transformer

It depends on what do you need.
Do you need do keep galvanic isolation?
Do you need differential to unipolar (balanced to unbalanced) conversion?
Etc...
 

hamid.abbaszadeh

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Re: i want to use a circuit or device istead of transformer

trans is coupler 1:1 for eliminate noise
vout- have diffrence with GND ,if connect vout- to gnd generate noise
but if we use trans 1:1 eliminate noise
now i want to use a circuit or device istead of trans
https://images.elektroda.net/98_1337058894.jpg
 
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FvM

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Re: i want to use a circuit or device istead of transformer

Analog optocouplers are a principle option. High performance analog isolation systems ("isolation amplifiers" are using modulation/demodulation or AD/DA conversion). Transformers are still the standard method for high quality audio isolation, and also the cheapest way for low and medium quality.
 

etmabreu

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Google for "difference amplifier". It takes a differential signal in the input and its output is single ended.
 
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FvM

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Google for "difference amplifier".
Yes. I omitted this option, because nothing has been said about expectable common mode "noise". If it's limited somehow, a differential amplifier is good option.
 

hamid.abbaszadeh

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i test difference amplifier,but generat noise,i use from lm358 and ad620
do you know a trans within ic package?

i want a part number mini trans or part number trans within ic package.
expecting your comments
 

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