bc557 100khz frequency switching doubts

[raman00084]

from pic micro controller i am generating 100khz square wave signal. i am feeding the square wave to 6n136 optocoupler but the output of optocoupler is phase inverted in order to correct it i am using 557 transistor. my doubt is can i use 557 transistor for switching 100khz frequency is there any other way. i want to just optoisolate (separating two grounds) with the same phase of pic wave form.

regards
kalyan

 

[wp100]

Hi,

If you see the transistors datasheet its transition frequency is quoted a 100 Mhz Minimum so think as a simple inverter it will just about manage 100Khz.

 

[Ogu Reginald]

The BC557 can work at frequency more than 100kHz.

 

[FvM]

Depends on your duty cycle requirements. You'll observe a certain asymmetry due to saturated switching.