video amplifier - universal amplifier and distri butor for video signals

video amplifier elektor december 1983 universal amplifier and distri butor for video signals A video amplifier rarely needs a high gain. By "high" we mean a factor of 100 or more, as is the norm for audio pre-amplifiers. For adjusting video levels a gain factor of 2 or 3 times is generally called for — maybe a bit more in a few cases. In this circuit we have made the amplifi- cation adjustable between 1 x and a good 4 x, so that the amplifier is suitable for almost any situation where boosting is needed. The maximum output voltage is 4 Vpp, and the input and output impedance is, of course, set at 75 ohms. As well as being a normal amplifier, this circuit can also be used as a video signal distributor, which is handy if more than one channel in a video chain are to be driven from one video signal. As we have already said, the amplifier has three out- puts. However, that is not to say that they all have to be used. The circuit can also be used with just one or two outputs. Now the...