Go Down

Topic: 2n3819 Mosfet Rf amp (Read 111 times) previous topic - next topic

mikedb

Hi

I would like to know how to get a 2N3819 transistor to amplify a freq from 1MHZ to 50MHZ.

There is many diagrams on the internet but for a few years now just cannot get the 2N3819 to work.

I always end up using a 2n2222  or BC238 but I would like to measure lower Rf values,with a freq counter.

Thanks for any advice.

vaj4088

Why not use the 2N2222 ?  It is cheap and if you had it working for higher frequencies then you should have no trouble at a lower frequency.

You seem to be comparing a JFET with a bipolar transistor.  Did you use a different circuit ?  What is it ?

MarkT

http://www2.eng.cam.ac.uk/~dmh/ptialcd/trf/trf.htm#rfamp

Biasing for a JFET is totally different to a BJT, and depends on the device specs much more.

When you say "amplify a freq from 1MHZ to 50MHZ." do you mean to imply broadband?
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

Go Up