Hartleys oscillator using bjt

Thread Starter

vishal60

Joined Nov 30, 2009
3
what is RFC(radio frequency choke) and y is it used in Hartleys Oscillator circuits(BJT) instead of a collector resistance??

Thanks in advance:):)
 

Audioguru

Joined Dec 20, 2007
11,249
A choke is an inductance. An inductance has a high reactance (impedance) at high frequencies. It passes DC current very well but is a high impedance at high frequencies.
 

S_lannan

Joined Jun 20, 2007
246
Makes the circuit more efficient. The resistor is a dissipative load at all frequencies concerned.

The inductor is a reactive load and doesn't dissipate power
 

KL7AJ

Joined Nov 4, 2008
2,225
what is RFC(radio frequency choke) and y is it used in Hartleys Oscillator circuits(BJT) instead of a collector resistance??

Thanks in advance:):)

You can also resonate the collector inductance with a suitable capacitance and get a cleaner signal.
 
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