hello friends,

can anyone tell me the exact match for the transistor 2sc2078 ?

i gonnna use it in a amplifier circuit at 13 mhz.

and also make me clear with my doubt !

my doubt is , can i opt for a binacular core instead of two ferrite beads glued togather in parallel manner ?iam using these cores for building inductor.will the inductance value change when i use binacular core (for same turns as in ferrite beads)?

 

Hello,

You posted it also last week:
http://forum.allaboutcircuits.com/showthread.php?t=32283

See the list for RF transistors in to220 housings.
There will probably be no exact match.

Greetings,
Bertus

 

thanks bertus

 

Part of being an engineer or a tech is figuring out how to make less than ideal parts work in the real world. Many (if not most) an exact match is not needed, all you have to do is look at what the stressors are going to be, and make sure the part can handle it.

 

Hello,

Some time ago I showed another schematic to an other forum member for an amplifier with a mosfet:
http://www.flashwebhost.com/circuit/60_watts_rf_amplifier.php

This was the original thread of it:
http://forum.allaboutcircuits.com/showthread.php?t=19386

Greetings,
Bertus

 

http://www.rfparts.com/index.html has both the 2sc2078 and the replacement 2sc2075 Some also claim that the ERF-2030 from ELK also can be used
If you live in europe try http://www2.cricklewoodelectronics.com/Cricklewood/home.php

 

I built Bertus' amplifier but used an IRF-510 instead of the IRF-840. It seemed to work fine after a little tweaking. If you can't find the exact parts, I would recommend breadboarding the circuit first so you can experiment with part substitutions without having to do alot of soldering and de-soldering. Using a breadboard or free-style soldering can help you with your experiments.