| 摘要 |
PURPOSE:To stably expand the waveform of a video signal with a simple circuit constitution by using two kinds of diode characteristic to expand waveform distortions of the white part and the synchronizing signal part of the Video signal. CONSTITUTION:In case of the white part of the video signal inputted to the first transistor TR Q1, the first silicon diode DS is in the forward direction and a current flows to the first resistance R5. But the second germanium diode DG is in the reverse direction and the current does not flow to the second resis tance R6. In case of the synchronizing signal part, the diode DG is in the forward direction and the diode D3 is in the reverse direction, and the current flows to the resistance R6 but does not flow to the resistance R5. The emitter current of the TR Q1 is changed by values of diodes DS and DG and resistance R5 and R6 to change the amplification factor, thus expanding the white part and the synchronizing signal part of the video signal. |
