12/10/2023 0 Comments Audio ground loop isolator schematicThe 0.16uF*** looks like a low Z ground for shunting hum noise from cables and product chassis. The GFCI circuit will protect meat puppets even with an open circuit ground path. Of course this is not remotely UL approved so don't tell your lawyer. ![]() From memory (which even I don't trust) I think the series cap value I computed to still trip the GFCI 6 mA with 120VAC) was something like 0.16uF. Instead of completely opening the safety ground path I kept a capacitor in path. I am sure I posted about this back when I researched it but I developed an approach around a GFCI power drop with a ground lift switch. Ĭlick to expand.Besides what I already posted? In a live situation where you might have 10's of thousands of watts of dimmable lighting racks a three phase supply is used, typically you have sound on one phase, lighting on another and anything else electrical such as bar equipment on the third phase. In the studio I worked in there was the biggest lighting panel I ever saw ,no dimmers whatsoever ,just a bank of 50 or so switches controling many pairs or clusters of colours that could be mixed, brightness or dim wasnt controlled by SCR's ,but by number of switches turned on. Maybe suggest trying only incandesent lamps without dimmers in the room your guitar player is working in, it might involve keeping the usual semi pro studio 'mood' lighting panel fully off ,and just running a few table lamps directly from the sockets , The halogen lamp is less troublesome, some modern Cfl are dimmable, these will most likely make a bad situation worse , Īnything with a pick up coil or unscreened electronics is noisey as hell ,like you describe at a similar level to the sound output in close proximity to the CFL, its makes the entire room totally incompatible with almost any kind of low level amplification. Kill switch anything running off SCR dimmers for a start, I have one room with a dimmer switch, two dials, one with a non dimmable CFL, so its always set to full if its on, and another halogen which dims fine. The diodes are 35A which seems high except they are on purpose to allow the breaker to do it's job. Obviously using a 3 prong to 2 prong plug is not only dangerous, it is a big no no for many reasons.ĭo things like the attached below really work? ![]() Obviously the guitars would need better shielding internally and should have it. The amp when not connected to a guitar was quiet as a church mouse.Īside from the obvious of the studio needs to be electrically wired correctly, no bootstrapped grounds, Iso ground outlets, etc/ What are some good ways to band aid the situation to work. The buzz would change volume based upon where you positioned yourself with the guitar in the room and the buzz changed when the el cheapo dimmers were used. This was with any guitar and pick up combo of active or passive, Humbucker or single coil except for one Strat with noiseless pickups. A friend was "recording" but the electrical was so bad that any guitar amp with almost every guitar they had was buzzing to the point it was louder then any guitar audio. Was reading up on this after a studio visit yesterday.
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