The transformer coupled with LM1893

[milanino]

the transformer coupled with LM1893. it's a simple transfo 220v/18v or an isolation transfo???
and the pin 5 i link it with pic to have 1 logic for Tx and 0 for Rx

Help please

 

[chuckey]

I would thought that it is a HF transformer and is resonated by the 33NF cap. its purpose is isolation AND rejection of the 50 HZ. i.e. it might by 1 :1 ratio, but due to the series caps at the input only has 12 V AC there.
Frank

 

[milanino]

Can you give me some reference to have this transformer??

 

[Audioguru]

The LM1893 and the Toko transformers are obsolete and are not made anymore.
They were used to send and receive very slow data for short distances 18 years ago.

 

[milanino]

i send data for short distance for that i use LM1893

 

[Audioguru]

i send data for short distance for that i use LM1893

Why don't you make a modern circuit that uses high speed data?
Use radio (Bluetooth) or use infrared (TV remote controls).

 

[FvM]

Review the datasheet at ti.com. It tells you everything you need to know about the chip. Presumed you have exemplars of the IC at hand.

 

[milanino]

the project is power line remote control for that i use LM1893 because other circuit like ST7540 are very expensive