Comments on: Secrets of hum elimination plug

By: Tomi Engdahl

Tomi Engdahl — Sat, 18 Jan 2025 11:19:49 +0000

https://huggingface.co/blog/static-embeddings

By: Tomi Engdahl

Tomi Engdahl — Sat, 18 Jan 2025 11:13:47 +0000

https://www.hifihuone.fi/tuotteet/kaapelit/virtapuhdistimet-ja-jakoblokit/ifi-gnd-defender/

By: Tomi Engdahl

Tomi Engdahl — Sat, 15 Jun 2024 08:10:16 +0000

Fix the pin 1 problem and you won’t need a half-ass gimmick.

https://www.prosoundweb.com/the-pin-1-problem-revisited/

By: Tomi Engdahl

Tomi Engdahl — Sat, 15 Jun 2024 08:08:32 +0000

Greer Kemp I’m surprised that Audiophools haven’t taken on board the “Technical Ground” approach that was widely used in Analog TV studios. The AC power for the signal pricessing was run through an isolation transformer, and the ground was an actual stake driven into the actual ground. You could even get special high-conductivity cement, so you’d drill something like a 3″ hole, fill it with the cement, and put the grounding rod into it.
I mean, the lift in audio verisimilitude and musicality was staggering, to anybody with ears capable of hearing it, that is

By: Tomi Engdahl

Tomi Engdahl — Sat, 15 Jun 2024 08:07:37 +0000

may do… I prefer to fix the real cause of the ground loop by correcting the grounding system and by using isolators in the signal path, rather than potentially compromising the protective earth.

By: Tomi Engdahl

Tomi Engdahl — Sat, 15 Jun 2024 08:06:59 +0000

If you then have a fault and a large ground current flows, it could easily take out the diodes, and if they blow before the fuse or breaker, you would end up with a potentiaaly lethal high voltage on the equipment as the ground had effectively been disconnected.

By: Tomi Engdahl

Tomi Engdahl — Sat, 15 Jun 2024 08:06:28 +0000

It’s quite simple; it just puts a pair of anti- parallel silicon diodes in the ground lead connection. Silicon diodes only switch on when the applied voltage exceeds about 0.6 Volts. So small AC signals responsible for audio hum can’t get past the diodes, but if you get a short between the live wire and ground, that will still be passed by the diodes, blowing the fuse or tripping the circuit breaker.
So it has the same effect on the audio as removing the ground connection, but still retains the safety of a grounded appliance.

By: Tomi Engdahl

Tomi Engdahl — Thu, 15 Jun 2023 18:18:00 +0000

https://www.facebook.com/groups/DIYAudio/permalink/6530697376996053/

It is possible to use a galvanic isolator, which in essence is two or three diodes in series, with a parallel set pointing the other direction. This will lift the equipment ground up by a couple of volts, and potentially raise the reference out of any noisy ground. While maintaining AC conductivity. They are used on boat shore supply’s to reduce galvanic corrosion when hooked up to shore mains supply. The diodes are special ‘safety, fail short’ AYBC approved components.

finally someone with a solution rather than the cannot do replies we usually see… or read a book type dismissive replies. Jon, for sure we need more of you!

, thankyou, here is a link to one for reference. https://sterling-power.com/products/zinc-savers-galvanic-isolators

By: Tomi Engdahl

Tomi Engdahl — Thu, 08 Sep 2022 11:07:03 +0000

GND control.

Take out speaker hum.

https://ifi-audio.com/products/gnd-defender/

AI ground detection.

With a GND Defender at the IEC power input, it will intelligently detect and remove the ground loop at the component.

Behind this, the GND Defender:

Intelligently breaks DC ground loops to eliminate ground loop hum
EMI shielding is retained
Equipment Safety is unaffected (not a ground lift – so maintains equipment safety ground)

If multiple ground loops exist, more than one GND Defender may be required.

The GND Defender is smarter than the average ground lift. By a long way.

Battleship build.

The GND Defender is not only at the cutting-edge in terms of technology but also safety:

High-performance glass passivated semiconductor
High Case Dielectric Strength of 1500VRMS UL Listed
X7R Capacitor
High-temperature stability
Flame resistant IEC socket/connector/chassis
Fireproof polymers UL94-V0

Remember that best practice is to always keep at least one direct power cable connection.

Surge overload rating of 220A. With a maximum rating >10A, continuous current rating 7A, it handles all voltages around the world from 90-240V.

By: Tomi Engdahl

Tomi Engdahl — Tue, 07 Sep 2021 12:42:22 +0000

Earthing the DC ground does not cause hum. A well-designed grounding scheme is both safe and hum-free. Hum enters the picture when the constructor assumes all earth are equal, then discovers that there are small (audible) rectification currents entering the audio path from differences between the various ground points they have used. Grounds should all terminate at one point – known as “star”.

This article by Rod Elliot shows its use in more detail and provides a few more tips – including the use of a “star” ground point: https://sound-au.com/earthing.htm