Do you have an input cap on the F5?
If you don't, you need those caps. There is some DC on the output of the 1212m because the CS4398 has 2.5VDC by default on both the + and - output pin. The caps are required if you run unbalanced without an input cap on the amplifier.
Of course, those who run in balanced mode need not worry as the offset cancels out when connected to a balanced input.
When you adjusted the offset, did you short the input or adjust it with the soundcard connected?
If you don't, you need those caps. There is some DC on the output of the 1212m because the CS4398 has 2.5VDC by default on both the + and - output pin. The caps are required if you run unbalanced without an input cap on the amplifier.
Of course, those who run in balanced mode need not worry as the offset cancels out when connected to a balanced input.
When you adjusted the offset, did you short the input or adjust it with the soundcard connected?
just keep it in permanent restarting ......
seriously - use some other decent source , at least for test ; if you find that you're still in short with gain - make any of several adequate small gain preamps you can find around ;
Juma made few small pre's , just for F5 .....
seriously - use some other decent source , at least for test ; if you find that you're still in short with gain - make any of several adequate small gain preamps you can find around ;
Juma made few small pre's , just for F5 .....
Ummm... isn't the B1 a buffer? That means a gain of <1?
hard to get gain from a buffer...
_-_-bear
hard to get gain from a buffer...
_-_-bear
hi.I measured both outputs and see -1.2mv on the left and -4.1mv on the right.I think living with this offset is better than using coupling caps.I think it does not hurt
TO-220 Fairchild Variants
Well, I said they will work -- they will, kind of...as pointed out the case to ambient thermal impedance is higher than the TO-247's -- I was able to get them cooking but somehow the N-Channel device was a just a wee bit loose and went to semiconductor heaven...i think they probably have to be mounted with just the correct amount of torque. I haven't had a problem with either Fairchilds or IRF-Vishays in TO-247.
Well, I said they will work -- they will, kind of...as pointed out the case to ambient thermal impedance is higher than the TO-247's -- I was able to get them cooking but somehow the N-Channel device was a just a wee bit loose and went to semiconductor heaven...i think they probably have to be mounted with just the correct amount of torque. I haven't had a problem with either Fairchilds or IRF-Vishays in TO-247.
Member
Joined 2002
YUK!
Just run it passively, i bet you will be very impressed on how clean the sound is. Simple pot, like Nelson says, SIMPLE always wins 🙂
Sounds like you haven't read the whole story... the problem is that the sound-card has been "upgraded" by removing components so that it now plays low output and distorted. 😀
Member
Joined 2002
Sorry 🙂
Well adding a Buffer or any pre-amp isn't going to fix this, just amplify the distorted stuff.
Buy new sound card or put back to original.
hehe.No it plays louder and clearer.I see what the problem is.Because of bridging capacitors and listening at the top of highest volume for 2-3 hours makes soundcard to reach the SOA i think.And it becomes distorted.But it is fixed when i restart computer.If it is broken it can not play crystal clear again.yes it plays much better than before.
And I saw why it plays low output.I connected cold side of right channel.It was broken in the past.before tweaking.But hot side plays louder and clearer now and i am listening to it.It is ok now.There is no problem. I am happy with my card now
😀
cviller says you broke the card and wants to make me angry but i wont be angry. hot sides of my emu1212m card plays better than his 0404.I am listening unbalanced.He should listen to mine😀
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Don't panic! Andrew is a very friendly and clever guy..... his bark is often worse than his bite. 😉
Yes, to understand Scots you have to have watched "Braveheart", "Trainspotting" "Brigadoon" and "The 39 Steps", and remember that the study of philosophy and engineering originated in Scotland, not Greece as we were originally taught.
Thanks for everyone for every help.Thanks Andrew and the other friends.I think not Scotland and Greece.The Muslims found them.For Math as you know Algebra It is El Cebir He found the "Zero"and also for engineering there is Abul İz el-Cezeri and many others.If you research in objective resources if you can find ( not European ) you will see what i mean