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You could add a ground breaker to your amps' chassis ground connection.
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Originally Posted by: Brian Donegan  You could add a ground breaker to your amps' chassis ground connection. I gather by your response the idea of output transformers is not a good idea? I guess I was hoping something similar to the way you isolated the inputs the the 4 way SPDIF might work? Edited by user Wednesday, August 14, 2013 10:58:15 AM(UTC)
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Originally Posted by: DQ828 Originally Posted by: Brian Donegan You could add a ground breaker to your amps' chassis ground connection. I gather by your response the idea of output transformers is not a good idea? I guess I was hoping something similar to the way you isolated the inputs the the 4 way SPDIF might work? I am using some Sowter 9545 output transformers and this is working great
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I just thought it would be better to remove the ground loop than to side-step it.
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Originally Posted by: Tostaki Originally Posted by: DQ828 Originally Posted by: Brian Donegan You could add a ground breaker to your amps' chassis ground connection. I gather by your response the idea of output transformers is not a good idea? I guess I was hoping something similar to the way you isolated the inputs the the 4 way SPDIF might work? I am using some Sowter 9545 output transformers and this is working great Thanks Are these transformers directly after the IVY or instead of the IVY?
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Originally Posted by: Brian Donegan I just thought it would be better to remove the ground loop than to side-step it. I may do the ground breaker as well, but have read conflicting reports on there effectiveness. I have used a SMPS in the DAC to run the Arduino originally thinking it would be easy to isolate it completely from the BIII but it seems this whole grounding/isolation thing is not as easy as I expected. I'm now having issues with DAC 1 when I try to reintroducing it to my main system which I suspect is directly relate to the grounding/isolation, basically it works fine (DAC 1)with my Kingrex amp that is not earthed & wont work at all with my main amps that are earthed.
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Originally Posted by: Tostaki Originally Posted by: DQ828 Originally Posted by: Brian Donegan You could add a ground breaker to your amps' chassis ground connection. I gather by your response the idea of output transformers is not a good idea? I guess I was hoping something similar to the way you isolated the inputs the the 4 way SPDIF might work? I am using some Sowter 9545 output transformers and this is working great I had a look around & I now assume you are not using the IVY & are going directly from the BIII to the transformers. I was wanting to leave the IVY in place & have transformers after it, if it's possible to get a good result doing so. Edited by user Wednesday, August 21, 2013 11:00:23 AM(UTC)
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I am using the transformer as I/V stages. It should be possible to use the transformers but with a 1:1 ratio. Sowter 3603 is one of them I did not test it the way you are thinking about
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Originally Posted by: Tostaki I am using the transformer as I/V stages. It should be possible to use the transformers but with a 1:1 ratio. Sowter 3603 is one of them I did not test it the way you are thinking about Brian & Russ What do you think of this approach? If you think it's ok, which one would you use  The Sowter 3603 Or the http://au.mouser.com/Pro...osRgpRAUUajFHmqyIwwBY%3d Given that the IVY has an "Extremely Low!" output impedance and my Linkwitz ASP crossover, that the IVY feeds,(not the amps directly) has a 10K input impedance, if I was to use the 1:1 transformers, would I be better off using the 1k to 1k version? As appose to the 600ohm to 600ohm version. Either way I guess it's not ideal, but given the Tubeizator I have on DAC 2 has a input impedance of 96K & an output impedance of 30k, how bad could it really be. So many questions, so little knowledge. Edited by user Thursday, August 22, 2013 1:01:33 PM(UTC)
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I don't really like using output transformers, so I am not sure what to say. :)
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Originally Posted by: Russ White I don't really like using output transformers, so I am not sure what to say. :) I'd be very interested to know why you don't like using them. If I cant isolate the outputs I'm going to have to change the ground/earth setup which may not be a bad thing anyway. Ive been reading David Davenports diyAudio article on grounding again, it all seems to make sense until I try & apply it!!! So maybe I should put Input transformers on my ASP crossover? This is what Bill whitlock says " The point here is that the noise rejection provided by an input transformer with a Faraday-shield is far superior to that provided by an output typeHmm Edited by user Thursday, August 29, 2013 11:45:21 AM(UTC)
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Some carbon fibre/plywood case parts in the DIY vacuum press  Some carbon fibre/plywood case parts out of the vacuum press,  I don't recommend you try this at home, It takes too long :) Edited by user Thursday, August 29, 2013 7:03:53 PM(UTC)
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That is pretty awesome. :)
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I don't like transformers mainly because they inject linearity errors. I am not saying you shouldn't use them, just that I don't. :)
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Wow, as Russ said that is awesome! |
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The case has been 95% finished (and DAC playing DQ DAC1) for some time but I am not completely happy with the spray finish which means I haven't been able to put the Birdseye Maple trims on which means no photo's. I have been distracted building Lamps & have had to build 6 as they became popular amongst the family, all love jobs of course. The other thing I have wanted to do with the 2 DAC projects is replace the VERO boards with purpose made PCB's so I have designed (very simple) and had some boards made. I have 10 of each but probably don't need them all. There is a 100mm x 50mm (4" x 2") that has a fairly Generic IR board, a Rotary Encoder board, a GND board (Star GND maybe) a GND/Power board & a relay board on it. The 50mm x 50mm board has 3 relay boards on it, 2 of which are for specific relays & one is generic. All of the relay boards are compatible with the Arduino re coil current. Anyway if anyone would like 1 or 2 let me know. David Hopefully the lamps (Christmas presents) will be finished soon & I can finish DAC1 & get going on the case for DAC2. http://i1118.photobucket...8DQPCB01_zps40b7f500.jpghttp://i1118.photobucket...QPCB01_1_zps2efec6c0.jpgEdited by user Thursday, November 28, 2013 12:05:28 PM(UTC)
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