Hi,
Is there a proper term for resistor-like inductors and how different are they from the air-core inductors? I have seen them available in various values, from 0.1uH to 470uH. Many FM transmitters build instructions I have read mention that you should not use resistor-like inductors, but only air-core types. So far I only heard that these are not stable at high frequency, but any thing other than that?
Also, I build my LC Colpitts oscillator using this type of inductor and a trimmer capacitor. The frequency is not stable and decreases every minute the circuit is running. Is this related to the inductor properties?
Is there a proper term for resistor-like inductors and how different are they from the air-core inductors? I have seen them available in various values, from 0.1uH to 470uH. Many FM transmitters build instructions I have read mention that you should not use resistor-like inductors, but only air-core types. So far I only heard that these are not stable at high frequency, but any thing other than that?
Also, I build my LC Colpitts oscillator using this type of inductor and a trimmer capacitor. The frequency is not stable and decreases every minute the circuit is running. Is this related to the inductor properties?
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