| 摘要 |
PURPOSE:To realize the simple composite video signal generation circuit which can continuously change the voltage at the synchronization section, bu constituting the circuit mainly with transistors and resistors. CONSTITUTION:Each collector of the two transistors Q1 and Q2 at least is connected to the power supply via the resistors R1 and R2, and the emitters are commonly connected. Video signal is connected to the base of the first transistor Q1 and synchronizing signal is fed to the base of the second transistor Q2, to pick up composite video signal from the common connection section of the emitter. Further, by changing the resistors R1 and R2, the voltage level of the composite video signal being the output signal can continuously be changed. Accordingly, the composite video signal generation circuit can simply be constituted in less number of components. |
