on/off Switch

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daisycutter

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Hello,

I have a Videosignal and an Signal from D-Flip-Flop. If the Signal from the D-Flip-Flop is about 5V, the Videosignal switch off, otherwise it should switch on. I first tried a circuit with an jfet (B245A). The Videosignal should pass the Transistor from Drain to Source. If the Gate has 5 V, the Transistor should switch the signal off .
Do anyone has an idea, what to do ?

daisycutter
 
that didnt work??
it should have..unless your jFET was hooked up inproperly..
how did you hook it up ?
the FET acts as a nice low resistance switch .
 
Use a video signal switch IC, it have proper 75ohm in and out impedance. TEA2014 or similar.
 
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