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 Forum index » DIY Hardware and Software » Stickney Synthyards
Audio Isolators
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PHOBoS



Joined: Jan 14, 2010
Posts: 3975
Location: Moon Base
Audio files: 584

PostPosted: Mon Sep 18, 2017 6:37 am    Post subject: Audio Isolators
Subject description: galvanic isolation
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I've been wanting to make some audio isolators for a while and I finally got the parts so made 3 of them. The main reason that I want
them is because at the moment my PC is putting every ground connection at half the mains voltage. Usually this isn't noticable untill you
touch something that is actually connected to earth. The reason this happens is because I don't have any earthed mains sockets (except
in the kitchen) and the PC PSU has a built in net filter that has 2 capacitors connected to earth/GND. So it isn't a direct connection and
the current is limited but it can still give you quite a tingle.

For the audio isolators I used the same configuration as I posted here so it can be used for mono and stereo connectors, mono and stereo
signals and it can convert between them. I drew up most of the configurations to see if it would work with the transformers and I noticed
that I did have to connect the GND connections of both inputs and outputs together. Of course inputs and outputs are not connected together
else it would defeat the whole purpose.

Another thing I noticed is that if you connect a mono signal to the Left Input and take the signal out from the Right Output it will be
attenuated and because one of the transformer coils is connected to GND it might also work as an RL high pass filter. If you connect
a mono signal to the Right input and take the signal out from the Right Output the two transformers and resistors are in parallel so this
might give a bit less attenuation than using Left-in, Left-out.


Mono-Stereo Audio Isolator.gif
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