Three Step Inductor

This three-step inductor consists of a coil of enamelled copper wire wound over an insulated spool. The coil consists of 4 layers of 200 turns each. The tappings at 200, 400 and 800 turns are brought out at 4mm sockets. The output inductances at these tappings are as follows.

• No. of turns Inductor Resistance 200 0.3mH 0.6Ohm.
• 400 1.2mH 1.2 Ohm.
• 800 5mH 2.6Ohm.
• One can easily change the inductor value of the instrument on just inserting a soft iron core inside the bobbin.