Clapp VCO

[capone]

Hye,
I have a problem with a clapp oscillator, he doen't work.Are de 2.2nF a good choice ? I want also use a varicap to tune it with a Pll I have programmed. Frequentie: 995khz tot 2155 khz

Schema:

https://www.uploadarchief.net/files/view/1

(doc1.doc)

 

[capone]

the jfet is a bf245c

 

[on1aag]

Hi Capone,

Change the BF245C in to a BF245B and isolate the source from
the capacitive load by inserting a 100 hm: resistor and
decrease the 838 hm: resistor to 738 hm: .

on1aag.

 

[capone]

it doesn't work and why change onto bf245b??