Jfet bipolar cascode video amplifier

Posted on Sep 29, 2012

The JFET-bipolar cascode circuit will provide full video output for the CRT cathode drive. Gain is about 90. The cascode configura-tioneliminates Miller capacitance problems with the 2N4091 JFET, thus allowing direct drive from the video detector

Jfet bipolar cascode video amplifier
Click here to download the full size of the above Circuit.

An m-derived filter using stray capacitance and a variable inductor prevents 4 MHz sound frequency from being amplified by the video amplifier.

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