EveryCircuit - Two-stage RC coupled potential divider bias.

12 years ago

And Ground? However, its not a Galvanic separation, be careful!

12 years ago

Thanks for ur advise but i want a little help bcoz noise is getting injected into the circuit what to do?? pls suggest

12 years ago

First thing you cloud do unwired the sin generator and run simulation again to check the operating points. Left and right collector voltage. You will find out that your 12V power supply is wrong wired. Turn it and check the voltages, which should be around 12V/2 = 6V. This you can fine tune with both resistors from base to ground. Hope this helps

hurz

12 years ago

One more tipp, remove the ground from receiver cap at output and lower the generator voltage from 2V to about 600mV

hurz

12 years ago

Receiver resistor base/ground is about 500ohm, have fun

Karthik7

12 years ago

Ok. I will try this. Thanks for your advice.

Karthik7

12 years ago

I have made changes according to what you said. Can u give your opinion whether its perfect or not. If the changes i have is not perfect then give your suggestion.

hurz

12 years ago

Power supply is still negativ. And you changed it to 6. Leave it 12V. 6V suppose to be the collector voltage. And 500 was a tipp for one resistor and not two..........

Karthik7

12 years ago

Done

hurz

12 years ago

The DC opterating point is still not ok at transmitter transistor. Start again by decoupling the AC and check all DC voltages if they are ok. Lower the emitter resistor to 140ohm maight help

Karthik7

12 years ago

Ok. I will try. Thanks for your help.Keep guiding me

hurz

12 years ago

I will do my best, however what do you want to build?

Karthik7

12 years ago

Atlast after serious calculations i have redesigned this circuit will u suggest if still anything has went wrong? Actually i have doubt whether the value of sin generator is too large.should i decrease its value or its ok??

Karthik7

12 years ago

Can anyone say me is that sin generator value is correct or wrong???

hurz

12 years ago

Ther is much more wrong, even you was closed a few days ago, now the ciruit is even worsen than in beginning. Powersupply 1V! AC cuppling input condensator! Much to high emitter resistor at first stage! I recommand you start with something easier for you. At least start with a single transistor.

Karthik7

12 years ago

Ok. I correct this again and i have already tried single transistor ckt and it worked very well so i started designing this ckt. Anyways as u said it has many mistakes i will find out and come up with new ckt. Keep guiding me. It has really helped me to improve my designing