Atom Feed - Twisted Pear Audio Support - Topic:DC offset on one SE channel - 20Twisted Pear Audio Support - Atom Feedurn:twistedpearaudio-com:AtomFeed:TwistedPearAudioSupport:Topic:DCoffsetononeSEchannel-20:1Copyright 2024 Twisted Pear Audio Support2024-03-29T07:21:29Zhttp://www.twistedpearaudio.com/forum/Images/YAFLogo.pngForum Adminhttp://www.twistedpearaudio.comfeedback@twistedpearaudio.comFallenAngelhttp://www.twistedpearaudio.com/forum/profile/7805-FallenAngelFallenAngelhttp://www.twistedpearaudio.com/forum/profile/7805-FallenAngelFallenAngelhttp://www.twistedpearaudio.com/forum/profile/7805-FallenAngelYetAnotherForum.NETurn:twistedpearaudio-com:ftPosts:st1:meid20367:1DC offset on one SE channel<table class="content postContainer_Alt" width="100%"><tr><td>Problem solved by replacing the opamp with an LT1057 I had around.<br /><br />Guess I somehow fried a single channel of the opamp (likely by plugging it into a new power amp I've built and tested, must have back-fired).<br /><br />Now on to buying another LM4562 and replacing the stacking socket I ripped off while taking the stack apart.</td></tr></table>2014-01-02T02:14:51-07:002014-01-02T02:14:51-07:00FallenAngel<table class="content postContainer_Alt" width="100%"><tr><td>Problem solved by replacing the opamp with an LT1057 I had around.<br /><br />Guess I somehow fried a single channel of the opamp (likely by plugging it into a new power amp I've built and tested, must have back-fired).<br /><br />Now on to buying another LM4562 and replacing the stacking socket I ripped off while taking the stack apart.</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid20366:1DC offset on one SE channel<table class="content postContainer" width="100%"><tr><td>Hi guys,<br /><br />I've recently discovered that one channel has a DC offset problem. I've went over the components and everything looks fine. I had to replace VR4 as it got damaged during debugging. Since the balanced/SE stage only has passive components except for IC1, I'm having a hard time tracking down the problem.<br /><br />I'm seeing that the DC offset on the left channel is about 4mV on startup and it slowly drifts down to close to under 1mV within a few minutes, while the DC offset on the right channel starts off around 140mV and drifts to about 5mV within 15 minutes (as I adjusted VR4 when the output stage was warm).<br /><br />I'm thinking the only thing left to do is replace IC1 with another opamp, then I'm completely out of ideas.<br /><br />Any thoughts?</td></tr></table>2014-01-01T23:15:09-07:002014-01-01T23:15:09-07:00FallenAngel<table class="content postContainer" width="100%"><tr><td>Hi guys,<br /><br />I've recently discovered that one channel has a DC offset problem. I've went over the components and everything looks fine. I had to replace VR4 as it got damaged during debugging. Since the balanced/SE stage only has passive components except for IC1, I'm having a hard time tracking down the problem.<br /><br />I'm seeing that the DC offset on the left channel is about 4mV on startup and it slowly drifts down to close to under 1mV within a few minutes, while the DC offset on the right channel starts off around 140mV and drifts to about 5mV within 15 minutes (as I adjusted VR4 when the output stage was warm).<br /><br />I'm thinking the only thing left to do is replace IC1 with another opamp, then I'm completely out of ideas.<br /><br />Any thoughts?</td></tr></table>