| 摘要 |
<p>PURPOSE: To reduce the used number of transistors. CONSTITUTION: Either one side of the output side transistor T2 of a multivibrator 1, and a transistor TA for amplifying at the next stage connected to the output side transistor T2, is made in a PNP type, while the other side in an NPN type. As a result, by using only one transistor fewer than the conventional method, for amplifying of a driving circuit, the illuminance control of a light source lamp can be carried out, and furthermore, the light source lamp is subjected to continuous current-carrying to improve the maximum illuminance easily, and the cost can be also reduced.</p> |
