See in the drawing where it says "input"? This feeds the top triangle and represents the original single ended amplifier with its +out.
(These simple triangles are how we engineers call out an amplifier block. This block can range from the very simple to the complex, tube, solid state, op amp, SET, whatever. In this drawing it is a simple op amp)
The "+out" is our standard RCA output for single ended signals. If we want balanced, we need only add a second amplifier block. This block (the lower amplifier triangle) is called an inverting amplifier because it flips upside down what is fed to it. The "-out" is the second of our two balanced outputs needed.
Tacking an additional amplifier stage onto an amplifier works. It is not the preferable way to do this when sonics matter. There is a better way, one we'll discuss tomorrow.
Your takeaway for today. What you see pictured is how 90% of all high end preamplifiers, DACs, sources, of all kinds get their second out of phase output to make them "balanced".
Balanced outs
See in the drawing where it says "input"? This feeds the top triangle and represents the original single ended amplifier with its +out.
(These simple triangles are how we engineers call out an amplifier block. This block can range from the very simple to the complex, tube, solid state, op amp, SET, whatever. In this drawing it is a simple op amp)
The "+out" is our standard RCA output for single ended signals. If we want balanced, we need only add a second amplifier block. This block (the lower amplifier triangle) is called an inverting amplifier because it flips upside down what is fed to it. The "-out" is the second of our two balanced outputs needed.
Tacking an additional amplifier stage onto an amplifier works. It is not the preferable way to do this when sonics matter. There is a better way, one we'll discuss tomorrow.
Your takeaway for today. What you see pictured is how 90% of all high end preamplifiers, DACs, sources, of all kinds get their second out of phase output to make them "balanced".
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