#Ground loop isolator schematic seriesIt is possible to use one of their other WSM series transformers as a ground loop isolator if one needs the voltage stepped down or up or needs to match a higher impedance to a lower impedance or vice versa and the transformers can be wired as balanced to unbalanced, balanced to balanced or unbalanced to unbalanced. I'll post a schematic soon as I get one drawn up. Ground loops will affect sound quality and those who don't know may think it is just a buzz or hum due to something else. Now because the computer audio out and the stereo audio in of the mixer are unbalanced I wired the transformers as unbalanced which is where the center tap isn't used. I had never been that impressed with their system and thought it was as good as it could be, but I was wrong. It's as though someone took the upper midrange sliders on an EQ and lowered them to their center position and raised the treble sliders to their center position. I thought to myself wow this system is actually so clear sounding now. Little did I know just how much better it was until a few songs came on that has a lot int he treble and I was shocked to say the least at how much better the sound was. I then noticed a little change in the audio, but as the night went on and I played more music I started to realize wow it really is sounding much clearer. #Ground loop isolator schematic installI proceeded to install those in a box and installed the box between the PC and mixer. I remembered that I have a couple Edcor WSM 15K/15K balanced/unbalanced audio transformers from an amp project that was designed to drive a 1920's high impedance speaker. I´ll try this one for the moment, see how well it goes and then I´ll probably try one of this high linearity optocouplers.I DJ at a local skating rink Friday and Saturday nights and had noticed a buzz in the audio which only happened when their computer which is apparently powered by a different power circuit than the mixer is connected to the mixer. If it sounds right, it´s going to be pretty much ok. I have to build the circuit first and test it, to see firstly if it eliminates the hum, and secondly if it sounds right. It should be fairly linear at that range. That means that the LED is going to operate in the 2mA - 8mA range. And I think that the mixer has a 2.5Vpk-pk voltage output max, something like that. The voltage output of the PC is 2Vpk-pk? Something like that, maybe less. Also, I really only use it for PC - mixer and mixer - PC interconnection. Between 1mA and 10mA the graph seems linear enough. Furthermore I am biasing the LED at 5mA with a max swing amplitude of 4mA. I am also driving the led with current and not with voltage, that should make a difference. According to the datasheet of 4n27 I am indeed working in the linear range. Vishay has something similar as far as I remember. I´ve seen that kind of optocouplers before, like the LOC110. To tell you the truth, the above circuit was a 4a.m. If there is someone who is willing to build it, I will upload the schematics and board. Another good thing is that the design is working from a single 5V rail when you want to experiment with it! I´ve built everything in just 4 - 5 hours so if I missed anything please have mercy! I hope you like it and that someone might find it useful! Best Regards, Lefteris Thessaloniki, Greece P.S. I biased it at 5mA and it´s working pretty much like a class A amplifier. I have NOT built it yet and not tested it in real world (only sim.), but should work nicely. Why not design one myself! And I did!!! I have no interest in earning money from it so I release it here open hardware Here´s the specs: Input ~3Vpk-pk (MAX) Output ~3.5Vpk-pk (MAX) Flat baseband from 10Hz to 20kHz with ~1.5db of gain. Unfortunately everything that has the word audio in it, and it is not a horrible Chinese product is expensive. Reading around the internet and after some research I found out that it´s a grounding problem and a ground loop isolator was needed. Unfortunately every time I connected it to the laptop (either input/output), it would become noisy. With the integrated microphones of my laptop being rather inefficient for producing a pleasant sound, I borrowed a Behringer mixer and microphone from a friend. From time to time I release youtube videos about electronics or other stuff that I like, but sometimes you need to work from your PC / Laptop to make a video. Hallo guys and girl, I finally decided to make myself useful in the forum.
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