Hi all, I'm looking to build a headphone amplifier, based around the CMoy design (**broken link removed**). Quick question, the circuit uses a virtual ground, at 4.5vdc, is it still fine to connect the headphone ground to this?
Secondly, it is going to be built in a metal case, which in turn will be rack mounted, so the case will be earthed to the mains, so is it best to keep everything separate, isolating the switches, sockets etc from the case and linking them to the virtual ground, or to re-design the circuit to use a single supply rather than dual supply, and link the grounds to the case?
Hope that makes sense, if I get time later I'll draw the circuit up properly, not just pen-and-paper and post it up for comments.
Cheers
Sam J
Secondly, it is going to be built in a metal case, which in turn will be rack mounted, so the case will be earthed to the mains, so is it best to keep everything separate, isolating the switches, sockets etc from the case and linking them to the virtual ground, or to re-design the circuit to use a single supply rather than dual supply, and link the grounds to the case?
Hope that makes sense, if I get time later I'll draw the circuit up properly, not just pen-and-paper and post it up for comments.
Cheers
Sam J