Bruno Putzeys maintains that one of the causes for many, many ground problems in audio is the (subconscious) way of thinking of voltages as being a property of a single node, rather than as the potential difference between nodes. The usual method to try to solve it all is to use fully symmetrical balanced circuitry, and accept the additional expense in parts and board area. Yet, as Bruno shows in this article, it is perfectly possible to ‘get your audio off the ground' with the usual single ended non-symmetrical circuitry. All it takes is a change of perspective and being consistent from start to finish. The article closes with a ‘demo project' that demonstrates the discussed principles. Thanks to the kind people at www.eurocircuits.com , a free PCB for this project is included with every purchase of Volume 5 (as long as stocks last).
The G Word, or How to Get Your Audio off the Ground