| 摘要 |
PURPOSE:To secure the noise deletion with use of one filter instead of conventional double filters by inserting one unit of the inductance element into the base circuit of the transistor. CONSTITUTION:When relay Q is operated through signal distributor SD, a loop is formed as battery E - capacitor C1 - inductance element L1 - R - contact q<0> - contact p<1> - battery E. Thus, capacitor C1 starts discharge, but a sudden current change is avoided since L1 is inserted. So the discharge current increases smoothly, and accordingly the current decreases smoothly between the collector and the emitter of transistor Tr. Then with operation of relay P through SD, capacitor C1 is charged in the route of E - C1 - L1 - R -q<0> - P<1> - P<2> - earth, but a sudden current change of the charge starting time is avoided by L1 to secure a smooth current change. The same smooth current change is secured also in the case of release of relay Q and P, and so the high frequency noise caused by the sudden current change can be deleted. |
