Constant current video amplifier

A non-inverting, constant current voltage amplifier powered by an electrical power source of a single polarity comprising:

• a first transistor having first and second terminals and a control input, said first terminal being coupled to a common signal level;
• analog switching circuitry having a plurality of inputs for receiving analog video signals from a plurality of computers, and at least one output for providing, a selected one of said video signals to said control input;
• an impedance coupled at one end to said second terminal of said first transistor;
• a source of current and of a discrete potential with respect to said common signal level;
• a second transistor having first, second, and third terminals, said first and second terminals comprising an input, and said second and third terminals comprising an output of said second transistor, said second terminal being coupled to said source of current and to an opposite end of said impedance;
• an analog video monitor having a load impedance, with said third terminal of said second transistor coupled to said load impedance;
• and
• a reference potential of a like polarity as said source of current and coupled to said first terminal of said second transistor, whereby said analog video signal is amplified without signal inversion.