| jam |
How about converting it into a balanced bridged amp which could solve the feedback issue.
It could turn out to be the ideal amp.....................;) ...............any comments?
Jam |
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| darkfenriz |
Very interesting !
Can solve the problem, but I have some questions.
Doesn't feedback path get twice as long?
I mean double phase shift, double distortion? |
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| MikeB |
On first look, you are feeding back output from amp1 to amp2 and vice versa,
in this case it is very unlikely that the fb does reduce distortions ?
Mike |
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| jam |
darkfeniz,
You do raise a good point. The circuit would work best with balanced drive but you would have doubled the slew rate and almost four times the power (assuming an ideal power supply) and feedback should correct for some of the distortion.
I have a gut feeling this would turn out to be a great amp...........I have been considering this topology for some time......I need to get around to building it.............:yes:
Regards,
Jam |
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| MikeB |
| quote: | Originally posted by jam
and feedback should correct for some of the distortion.
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??? :scratch: |
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| jam |
Mike,
I woud think we might have to ask Mr.Pass that question.
It just came to me that if we made each gain stage inverting would it not then qualify as an X-Amp.
Regards,
Jam |
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| jam |
I ment inherent distortion in the amp rather than the possible added distortion added by bridgeing the amp.
Regards,
Jam |
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| jam |
Ok...Ok
How about this................remove all the global feedback apply more degeneration and set the gain by R1.
Should make all the feedback hating diyer's happy.........a non global feedback bridged amp.......:D .............comments?
Jam |
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| MikeB |
:D Why not ?
But, now you are forced to use a really balanced inputsignal ?
Mike |
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| jam |
Mike,
Not really................grounding the - input should work with single ended inputs .......;)
Jam |
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| MikeB |
Yes, but with x2 doing nothing you have no bridged operation, the 2nd
amp needs to work exactly inverted to amp1 ?
Mike |
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| pinkmouse |
Hey guys
Don't you think you should let the Guru fifnish explaining his amp before you completely redesign it into something else?
It would only be polite! ;) |
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| MikeB |
| Sorry for that, maybe you can split starting at post #9 ? |
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| jam |
Mike,
A signal is present across R1 which is the input to X2 which is the inverting portion of the amp.
Jam |
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| jam |
pinkmouse,
I do apologise.........you are correct. I guess I got carried away by the possibilities of the topology.
Regards,
Jam |
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| pinkmouse |
:cop:
Split from this thread |
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| jam |
PMA,
Nice looking amplifier. Could you post the schematic.
Did bridgeing the amp this way improve the sound.
Regards,
Jam
P.S. I need to learn to read Czech....................;) |
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| Ultima Thule |
| quote: | Originally posted by jam
How about converting it into a balanced bridged amp which could solve the feedback issue.
It could turn out to be the ideal amp.....................;) ...............any comments?
Jam |
Yes,
that reminds a bit of a circuit I invented for some 10 years ago which gave a spatial stereo effect! :D
Cheers Michael |
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| jam |
Micheal,
You need to tell us about your circuit.............;)
Jam |
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| PMA |
| quote: | Originally posted by jam
PMA,
Nice looking amplifier. Could you post the schematic.
Did bridgeing the amp this way improve the sound.
Regards,
Jam
P.S. I need to learn to read Czech....................;) |
The amp is based on schematic shown here:
http://web.telecom.cz/macura/pm_ab_er1.gif
4 modules are used, 2 + 2 for stereo amp. Bridgeing brings advantage of CMV rejection, it effectively rejects (subtracts) mains components, so it is quite easy to use 1 power supply, which usually brings groundloops (hum) problem.
More can be seen here, partly in english.
http://web.telecom.cz/macura/pm_ab1.html
(I hope that pinkmouse would not need to split another thread .. :-)) |
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| Steve Eddy |
I think y'all are suffering from iron-poor blood.
Forget about all those complex circuits. Get your differential input stage and VAS stage all in one using just two lengths of wire and a chunk of iron.
Power supply quality issues? What power supply? :D
se |
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| PMA |
| quote: | Originally posted by Steve Eddy
I think y'all are suffering from iron-poor blood.
Forget about all those complex circuits. Get your differential input stage and VAS stage all in one using just two lengths of wire and a chunk of iron.
Power supply quality issues? What power supply? :D
se |
Let's invite Susan Parker in here, she knows how to make a transformer amplify .. |
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| Steve Eddy |
| quote: | Originally posted by PMA
Let's invite Susan Parker in here, she knows how to make a transformer amplify .. |
Why? The transformer already knows. :D
se |
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| PMA |
| quote: | Originally posted by Steve Eddy
Why? The transformer already knows. :D
se |
Especially very efficient when amplifying POWER ... ;) |
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| PMA |
| Are you heating your own soup Steve? ;) |
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| Steve Eddy |
| quote: | Originally posted by PMA
Especially very efficient when amplifying POWER ... ;) |
Aye. But of course I was only speaking of the input/VAS stage portion of the amplifier which is what spurred the original thread.
se |
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| pinkmouse |
| quote: | Originally posted by PMA
(I hope that pinkmouse would not need to split another thread .. :-)) |
I'm thinking about it. But it's most likely for Steve's ironwork... ;) |
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| Steve Eddy |
| quote: | Originally posted by PMA
Are you heating your own soup Steve? ;) |
Nah. Just in a smartass mood this morning. :)
se |
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| Steve Eddy |
| quote: | Originally posted by pinkmouse
I'm thinking about it. But it's most likely for Steve's ironwork... ;) |
Ok, ok. I'll leave you pale and pasty anemics to yourselves. :D
se |
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| jam |
Sorry I ment..............so much for the technical part of this thread.
Jam |
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| mlloyd1 |
jam:
you know that just was not right.
hee hee heeee
mlloyd1
| quote: | Originally posted by jam
Sorry I ment..............so much for the technical part of this thread.
Jam |
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| Ultima Thule |
GEEEE.... Jam's in good mood(y) today! :D
...well, the "spatial stereo" circuit is on a piece of paper... 400 km away from me right now! :bawling:
Cheers Michael
ps: what is the SW you are using... |
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| MikeW |
Jam, stop screwing around and post the good schematics.:clown:
Jam is always in a good mood.:D |
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| jam |
Guys,
What can I say.......................................:joker: :D
Michael,
What do you meen by SW?
Regards,
Jam |
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| Steve Eddy |
| quote: | Originally posted by jam
What do you meen by SW? |
I think he means "software." Perhaps he's asking what software you used to create that John Curl animation. :)
se |
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| Ultima Thule |
| quote: | Originally posted by Steve Eddy
I think he means "software." Perhaps he's asking what software you used to create that John Curl animation. :)
se |
:nod: |
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| Steve Eddy |
| quote: | Originally posted by Ultima Thule
:nod: |
Ah, thought so.
Actually I'm the one who created it using a combination of JASC's PaintShop Pro and Animation Shop as well as Xara for the text.
se |
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| destroyer X |
You made my day with your joke.
Wonderfull...perfect!
Very nice, inteligent, good mood.
Thank you because you exist!
regards,
Carlos |
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| jam |
Hi Carlos,
Steve designed it. I just put it up.
You can follow the further adventures of Transformer Man on the Audio Asylum.......:D |
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| PMA |
Jam,
Steve seems to post a lot there. Any special recommendation? ;) |
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| destroyer X |
Congratulations Jam
regards,
Carlos |
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| jam |
PMA,
You can catch Steve Eddy at Prop Heads at Audio Asylum.
Jam |
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| Steve Eddy |
| quote: | Originally posted by jam
You can catch Steve Eddy at Prop Heads at Audio Asylum. |
No you can't.
Prop Heads has been turned into the dumping ground for all the Intelligent Chip and Clever Clock threads. It's a total waste of a forum.
se |
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| jam |
Steve,
You are a regular party pooper......................:D |
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| thanh |
| balance amp can only kill noise if components are matched exactly and there are so many component had to be matched . Power transistor is too expensive than 2n5551 ,c1815 . I can't buy 100 units a1227 and match them . I buy 30 units 2n5551 and felt "$$$$$":D |
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| MikeW |
notes
If you want the plots of the data e-mail me.:D |
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