oscillator coil in a sentence

1. The point of the lab is to build two variable oscillator coils.
2. The cathode was connected to a secondary coil on the oscillator coil and thus coupled the oscillator into the pentode mixer section, the signal being applied to grid 1 in the conventional manner.
3. By the mid-1930s however, superheterodynes were using much higher intermediate frequencies, ( typically around 440 470 kHz ), with tuned coils similar in construction to the aerial and oscillator coils.
4. It's difficult to find oscillator coil in a sentence.