I've had a desktop amp project on my radar for a while and specifically drew it up using an input transformer because of all the hum headaches with many sources.Īnother option is to change your source selection rotary switch from a single wafer to a double wafer and have it switch both the shield and the signal for each source. Also if a source is powered by USB power and you also have the option of a wall wart, many gadgets have dual USB or wart power, try both, frequently one or the other won't hum. The easiest thing to try, is if the source has a three prong line cord is to lift the ground on that source with a two prong adapter keeping the neutral/hot properly polarized. Anybody have experience with that?Īt my desk amp I use 8 different sources for audio, a couple of DACs, a DJ mixer, a bluetooth adapter, tuner, a DVD player, computer, another receiver, and a few gadgets that use wall warts, Alexa and Google devices.įor the sources that hum it's almost always due to how those sources are powered. I'm assuming that the DACs in those things are looking for an inductive load before turning on to protect themselves or something. No aux input works, either on my headphone amp or any other commercial equipment that I've tried. I have gotten two of those USB-C to headphone dongles with the integrated DACs in them and they positively REFUSE to turn on unless actual headphones are plugged into them. I'm also hoping that this will solve a little problem I've run into. Any of you done this? Can anyone recommend a proper impedance for use with a tube amp? I'm using a 6DJ8 on the input and I don't know what input impedance it likes to see (or how to calculate it for that matter.) It'll take months for them to get here so if I find out I ordered the wrong transformers, I'm probably gonna break down and cry. They have some reasonable wide frequency response models over at Edcor in several impedances. The circuit is simple enough but I'm seeing several different impedance recommendations. I'm getting a parts list together for a headphone amp that I'm working on and would like to incorporate an audio source ground loop isolator using a couple of matching transformers.
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