| 摘要 |
<p>PURPOSE:To improve the productivity of heads by setting the winding ratio of a rotary transformer to >(1:2) and reduce the number of turns of the winding of each head, and also using a negative feedback damping for correcting characteristics. CONSTITUTION:A video head is connected to the primary windings 16 and 17 of the rotary transformer having the primary windings and secondary windings 21 and 22, and a preamplifier is connected to the secondary windings of the rotary transformer; and a feedback resistance is provided between the connection point between the rotary transformer and preamplifier, and the output of the preamplifier. Then the ratio of the primary windings and secondary windings of the rotary transformer is set to >2.</p> |
