neazoi
Advanced Member level 6
Hi, I have made an oscillator shown here **broken link removed**
I have noticed that by bringing a magnet close to molded chokes used for the tuning coil, I am able to achieve a big tuning range, about 5-18MHz with a single coil.
It seems a small magnet can do the job of a big (costly and bulky) tuning capacitor.
What are the pros and cons of this tuning method anyone can think?
Why it is not commonly used instead of variable capacitors?
I have noticed that by bringing a magnet close to molded chokes used for the tuning coil, I am able to achieve a big tuning range, about 5-18MHz with a single coil.
It seems a small magnet can do the job of a big (costly and bulky) tuning capacitor.
What are the pros and cons of this tuning method anyone can think?
Why it is not commonly used instead of variable capacitors?