- #Heating effect on ferrite core inductor portable#
- #Heating effect on ferrite core inductor mods#
- #Heating effect on ferrite core inductor tv#
#Heating effect on ferrite core inductor portable#
Not an issue if you're making a feedpoint mounted matching circuit for a HF antenna but is a big problem if you're making a small portable radio. For a receive only circuit you'll never hit core saturation.Įdit: Forgot to mention that ferrite cored inductors are much smaller than their air cored equivalents. This is typically only an issue in RF circuits for high power filters (ie: after a 100W power amp). This can introduce distortion (harmonics or IMD) as it causes the inductance value to change with instantaneous inductor current. NB: The only disadvantage of ferrite cored inductors is that if the core saturates the inductor becomes strongly non-linear. TL DR go ahead and try air cored inductors but if the circuit doesn't operate as desired (oscillator drift, poor filter attenuation, noise pickup from nearby electronics etc) then torroidal (or other shielded geometries) inductors will likely improve things. If you want 100dB stop band attenuation then torroidal inductors with shielding between filter stages would be needed. Note that this is only an issue if you want, say, >60dB isolation. Some stop band current in the first inductor can leak into the final inductor. If the inductor is part of a high order filter then stop band attenuation will suffer with air cored inductors as they will couple with each other. The means that currents in other parts of the circuit won't couple into the inductor as much and likewise currents in the inductor won't couple into other parts of the circuit.įor example if an air cored inductor is used in an oscillator the frequency will drift with placement of components around it (and also, say, with how close your hands are). The main advantage of a torroidal core is that it keep the magnetic flux contained within the core.
#Heating effect on ferrite core inductor mods#
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#Heating effect on ferrite core inductor tv#
TV Repair / replacing electrolytic capacitors
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