![]() I ended up using two different transformers and it worked great. You need one of these circuits per channel (right and left audio). Next, you need to understand the circuit you will be building. Female RCA Plug Project Box with RCA Installed I drilled 4 holes in my project box to allow easy access to the plugs. Get your connectors and project box ready. Using a de-solder tool and your solder pin, simply un solder the 4 legs and remove. Some look different but they are easy to spot. The big square thing on the modem is the isolation transformer you want to remove. They are mostly the same and are 1:1 ratio 600 ohm. You will be using the modems isolation transformer since its perfect for our intended use. I have a box full of old PC parts and it was no problem for me to locate them. ![]() I had everything I needed to build one in various boxes around the basement and it took me about 30 minutes to assemble.įind 2 old PC modems. It is possible to make one if you have enough junk around the house like I do. Today is Sunday, everything is closed, and I don’t feel like waiting a week for an online order. These can be purchased for less than $15 online or from an electronics store. This is accomplished with a “Ground Loop Isolator”. To eliminate this, you need to somehow separate the grounds so that there is no fighting for ground between the electronics. The voltage was back feeding from the video ground of the projector through the PS2 audio grounds and then to my stereo. Surprisingly, the noise was not between my PS2 and the stereo. I could hear a horrendous squeal in my speakers that was as loud as the normal games sounds. I ran into this problem when I connected a PlayStation 2 video game system to my home stereo and a DLP projector. The voltage difference can be heard as a buzz or squeal in the speakers and if its large enough, it can damage your equipment. This situation can occur when you have two or more electronic devices interconnected by either video or audio cables and they develop a slight electrical difference in their grounding with the power system. 90% of it is probably the result of a “Ground Loop” as was in my case. A transformer does this by magnetically coupling the signal across an electrically insulated barrier.įor an unbalanced interface, the transformer effectively stops any current flow in the cable caused by ground voltage differences, which stops the noise.įor a balanced interface, the transformer effectively prevents the common mode voltage from reaching the input stage of the equipment, which often has less than ideal performance.Eliminating buzzing and high pitch squeals in your home audio equipment can be a pain. In a balanced interface (professional audio), the ground voltage difference may reveal inadequate common-mode rejection at the input stage of the equipment or other design defects.Ī ground isolator in the signal path is the fundamentally correct way to eliminate system ground loop problems. This generally produces hum or buzz in audio and hum bars in video. In an unbalanced interface (video and consumer audio), this ground voltage difference directly adds to the signal. Ground loop problems are caused by small voltage differences that normally exist between the ‘grounds’ at the send and receive ends of a signal cable. ![]() Noise… Ground Isolation Solves the Fundamental Problem
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