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TL084 to???
TL084 to???
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Old 13th July 2017, 06:33 AM   #21
oohms is offline oohms  Australia
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It is probably an overall grounding issue more than anything else. If you could post an overall system diagram of your audio setup this could help troubleshoot the issue

I have built a 3rd order crossover using TL084's and it is completely silent (and sounds great)
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Old 13th July 2017, 10:52 AM   #22
AndrewT is online now AndrewT  Scotland
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I reported a slightly noisy crossover filter.
It turned out that the socket for one of the opamps was not making good enough contact.
Reinserting the opamp a few times removed the slight noise.
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Old 13th July 2017, 03:01 PM   #23
troystg is offline troystg  United States
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Quote:
Originally Posted by oohms View Post
It is probably an overall grounding issue more than anything else. If you could post an overall system diagram of your audio setup this could help troubleshoot the issue

I have built a 3rd order crossover using TL084's and it is completely silent (and sounds great)
Once again I have the complete schematic and PCB diagram however it was a new prototype Mr. Erath made for me off of his commercial circuit and even though he has passed I am hesitant to post it on the web.

I have used the Marchand XM1 for decades and it is fantastic. I have always assumed the issue with this project was the layout but the easiest change was swapping opamps so I was going to try that first. However most think that would be a waste of time.
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Last edited by troystg; 13th July 2017 at 03:08 PM.
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Old 13th July 2017, 03:08 PM   #24
troystg is offline troystg  United States
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Ok, so changing the opamp to a "newer flavor" will most likely NOT fix the issue. The alternative is redo the PCB and possible modify the circuit. Being a circuit consisting of just 2 quad opamps you would think this was an easy project.

Unfortunately some time ago I had to disassemble my lab / bench and I have not had the opportunity to to rebuild one so I will have to hire out for this project.

Any starving EE's out there looking for work? :-)
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Old 17th July 2017, 04:36 PM   #25
troystg is offline troystg  United States
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I had a Eureka moment over the weekend...

Since I have used the Marchand XM1's for years is systems and they were dead quiet why not bypass the whole XO section of the feedback unit and just use the FBN section as a stand alone. That way if the noise issue is with the XO section it will be alleviated and the feedback section can work UN-impeditedly.

If that works then a new FBN only pcb can be made and I can piggyback the Marchand XM1 on top.
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Old 17th July 2017, 06:07 PM   #26
Mooly is offline Mooly  United Kingdom
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TL084 to???
UN-impeditedly ! Well it might do It sounds like you are having fun though.
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Old 17th July 2017, 06:25 PM   #27
troystg is offline troystg  United States
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UN-impeditedly ! Well it might do It sounds like you are having fun though.
Love me some auto-correct...

But yes looks like I will refrain from trying to reinvent the wheel.

"Ain't" got no time for that!
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