different between molded inductor and coil wound inductor??? - Electronic Circuits Projects Diagrams Free

pepperman · 23rd June 2004, 05:29 AM

i am doing a RF transmitter(using FM),and the circuit function well when i use hand wound coil inductor in the oscilating circuit(transmitter use LC oscillator).However ,whenever i try replacing it with a molded inductor,the oscilating circuit fail to work.
Hope someone can give me some explanation^^
thank you

spuffock · 23rd June 2004, 07:19 AM

I suspect that the moulded inductor is intended for EMC filtering purposes. and its "Q" ( ratio of resistance to reactance) is too low for the circuit to oscillate.

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23rd June 2004, 05:29 AM	(permalink)
pepperman	different between molded inductor and coil wound inductor??? i am doing a RF transmitter(using FM),and the circuit function well when i use hand wound coil inductor in the oscilating circuit(transmitter use LC oscillator).However ,whenever i try replacing it with a molded inductor,the oscilating circuit fail to work. Hope someone can give me some explanation^^ thank you

23rd June 2004, 07:19 AM	(permalink)
spuffock	I suspect that the moulded inductor is intended for EMC filtering purposes. and its "Q" ( ratio of resistance to reactance) is too low for the circuit to oscillate.