Hello,
can i replace my dual mosfet with bjt? please if yes can you show one example pleaseeee……...

 

Hello,
can i replace my dual mosfet with bjt? please if yes can you show one example pleaseeee……...

IMHO, not very likely, since a MOSFET works on voltage control and the bjt works on current control. Adding extra eeeeees has no discernible effect on the answer.

 

IMHO, not very likely, since a MOSFET works on voltage control and the bjt works on current control. Adding extra eeeeees has no discernible effect on the answer.

And with jfet can i replace?

 

What's the circuit in question? ?

 

And with jfet can i replace?

No. A JFET and a MOSFET have different biasing requirements. What are you trying to do? Provide a circuit diagram and ask if there is a better way to design a solution. Random part substitution will get you exactly nowhere faster than any othe method I can think of. Did you really expect a positive response? Whatsa matta you?

 

What's the circuit in question? ?

Hello, its is dual mosfet mixer, but i dont understand the dual gate mosfet, i just ask to replace one dual gate mosfet with jfet?

 

No. A JFET and a MOSFET have different biasing requirements. What are you trying to do? Provide a circuit diagram and ask if there is a better way to design a solution. Random part substitution will get you exactly nowhere faster than any othe method I can think of. Did you really expect a positive response? Whatsa matta you?

Hi, i have a mixer with bjts, but there is one with dual mosfet, and i dont understand dual mosfet, can i be replaced with jfet

 

Hi, i have a mixer with bjts, but there is one with dual mosfet, and i dont understand dual mosfet, can i be replaced with jfet

NO.

 

What you are asking for is a complete circuit re-design.

There are still some people making Dual Gate MOSFETs, maybe you
can get by with a substitute. But even thats a redesign / test to make
sure you are getting the same performance out of the mixer.

Regards, Dana.

 

Hi, i have a mixer with bjts, but there is one with dual mosfet, and i dont understand dual mosfet, can i be replaced with jfet

Changing a minor feature of the question and asking it again won't change the answer. I think you might want to quit while you are ahead.

 

Michael1978 is still trying to make very old radio circuits but the old parts are not available anymore.

 

Michael1978 is still trying to make very old radio circuits but the old parts are not available anymore.

In which case he should update his research materials.

 

NO.

Thanks sir.

 

What you are asking for is a complete circuit re-design.

There are still some people making Dual Gate MOSFETs, maybe you
can get by with a substitute. But even thats a redesign / test to make
sure you are getting the same performance out of the mixer.

Regards, Dana.

I think you are right, but i learn from here mixer with bjts, and i understand
Thnx Dana

 

Michael1978 is still trying to make very old radio circuits but the old parts are not available anymore.

Hey AudiGuru long time,

 

In which case he should update his research materials.

hi give it to mee...

 

I have not been in university for many years so my research materials are out of date, then I increased my knowledge about modern parts myself. Michael is older (born 1978?) than most students so he is not in university.
Is there a member here that has recently studied radio circuits in university who can recommend new and correct research material?
Looking at "tutorials" in Google brings many old and incorrect ones as Michael has discovered.

 

The Radio Amateurs Handbook might be a good place to start.

 

https://www.qsl.net/va3iul/RF Mixers/RF_Mixers.pdf

Attached as well.

Regards, Dana.

 

Hello,

On the internet archive there are books and articles from the ARRL (american) and RSGB (british) available:
https://archive.org/search.php?query=electronics arrl&and[]=loans__status__status:"NULL"&and[]=mediatype:"texts"
https://archive.org/search.php?query=electronics rsgb&and[]=mediatype:"texts"

Those will have a lot of info for you.

Bertus