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JFET_BIPOLAR_CASCODE_VIDEO_AMPLIFIER

2014-11-14 15:05  
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JFET_BIPOLAR_CASCODE_VIDEO_AMPLIFIER
The JFET-bipolar cascade circuit will provide full video output for the CRT cathode drive. Gain is about 90. The cascode configura-tion e liminate s Millercapacitance problems with the 2N4091 JFET, thus allowing direct drive from the video detector. An m-derived filter using stray capacitance and a variable inductor prevents 4.5 MHz sound frequency from being amplified by the video amplifier.