| 摘要 |
<p>The device has a transformer (1) and pickups (5, 6, 7) connected with an electrical load (9), where supply voltage of the pickups (5, 7) is smaller than the pickups (5, 6). A control device (22) controls zero point switches (14, 15) that are arranged in two electric circuits. The switch (15) that applies the smaller supply voltage to the load is switched during controlling of an electrical power below a predetermined threshold, and the switch (14) that applies larger supply voltage to the load is switched during controlling of an electrical power above the predetermined threshold.</p> |
