| DarkHorse |
I design this Circuit Lastyear(2004)...
But Mr.Pass(Nelson Pass)had work it out as preamp in 1996...
God..
:smash:
Ok,let's see the Circuit: |
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| DarkHorse |
per channel power waste about 52Watte,
Output 3.25W(6ohm load)!!!
:bawling: |
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| Upupa Epops |
| What do you waiting from this connection ? :D |
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| DarkHorse |
:clown:
yes,I'm a new comer of diyaudio...
what do you think of this circuit?
I want to build one of this amp...
but short of some compenents...WoWo:smash: |
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| Upupa Epops |
| If you are newcomer, all is OK ;) - I wish you best results and many enjoy with it :cool: . |
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| DarkHorse |
Thank you,Mr.Upupa Epops
about 1 or 2 month later,I will show This AMP to you all..
it's so simple and easy to do,but need very large heatsink..
and high power transformer..;) |
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| PMA |
| Nice design ;) . Please let us know your listening impressions. Maybe you are losing a little bit more power than necessary ;) |
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| DarkHorse |
| quote: | Originally posted by PMA
Nice design ;) . Please let us know your listening impressions. Maybe you are losing a little bit more power than necessary ;) |
hi,PMA:
the amp didn't work out yet!But trying my best now--buying electric device and its out shell ..etc
I hope the circuit will sounds good,my friend told me that can it compare with 2A3 vacuum tube amp..
in fact,I don't own both of them now..haha
same as you expect,I doing things for it!
have fun!
hello,Circlotron:
I read your post thread "My first ever Class A amp",we almost have same idea of class-a amp form,yours is using inductance winding,the efficiency near to 50%...High!I saw the same idea in passlab.com, nelson pass new design zen-7,good idea..
but the high quality inductance is hard to DIY or buying!is it?
I don't want to change my mind-Use aluminium case power resistance,only this I can choose for this circuit..
and I hope it will sounds truly..
happy! |
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| DarkHorse |
I have make some change with the circuit..
now it don't need regulated power supply..
more high voltage supply,burning 67watte to get 4watte(RMS) output power!just like SOZ's hot..
see the update schematic diagram:
:smash: |
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| Graham Maynard |
Hi Darkhorse,
Please don't think that I am picking on you personally, but I so often see 'simple' circuits like these.
Yes (Post 10) will work, and it has simple internal ac and dc feedback, but ......... nobody ever seems to comment on the fact that the control of loudspeaker back emf is asymmetrical, and thus the amplifier's output is liable to become characterised by the crossover/loudspeaker combination much more than is the case with an output stage that is capable of *actively* conducting both positively and negatively.
For example there can be a hefty NFB controlled positive current flow via M1, but only the current due to (1 + 6.8 + speaker) ohms flowing negatively.
Cheers ........... Graham. |
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| DarkHorse |
| quote: | Originally posted by Graham Maynard
Hi Darkhorse,
Please don't think that I am picking on you personally, but I so often see 'simple' circuits like these.
Yes (Post 10) will work, and it has simple internal ac and dc feedback, but ......... nobody ever seems to comment on the fact that the control of loudspeaker back emf is asymmetrical, and thus the amplifier's output is liable to become characterised by the crossover/loudspeaker combination much more than is the case with an output stage that is capable of *actively* conducting both positively and negatively.
For example there can be a hefty NFB controlled positive current flow via M1, but only the current due to (1 + 6.8 + speaker) ohms flowing negatively.
Cheers ........... Graham. |
hi,Graham Maynard :
that is realy matter what your said,I will be back tomorrow,
..sorry!haha..time to off duty now..
happy! |
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| PMA |
| The circuit shown may serve as a "starting point" of the newbie el. designer. After he sees all the design flaws and problems he may move to higher circuit league - in this case the attempt would be valuable. |
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| DarkHorse |
| quote: | Originally posted by PMA
The circuit shown may serve as a "starting point" of the newbie el. designer. After he sees all the design flaws and problems he may move to higher circuit league - in this case the attempt would be valuable. |
hello,PMA:
haha...your word is funny and exactly,I don't feel any unsuitable
in this schematic,but I know if the amp runs,it's result will make me know more about the true!I will kept trying..
regards,
WINCO
:smash: |
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| DarkHorse |
perhaps,this circuit form is more fit to be preamp or headphone amp..
it's too low efficiency,when as a power amplifier..
and it hard to using constant current source instead of resistor..
here is the schmatic (author is our master:Nelson Pass) which I got it from internet,the main circuit form same as mine,but it is a preamp circuit: |
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| Upupa Epops |
| If you can easy to build amp, try PMA's " Mosfet follower ". Many positive references on this forum ;) . Efficiency of this connection is more better. |
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| DarkHorse |
| quote: | Originally posted by Upupa Epops
If you can easy to build amp, try PMA's " Mosfet follower ". Many positive references on this forum ;) . Efficiency of this connection is more better. |
hello,Upupa Epops ,PMA:
I have checked "MOSFET FOLLOWER",but find nothing..Wowo..
can you do me a favour to show this thead where?
best regards,
WINCO
:confused: |
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| DarkHorse |
wah..PMA is an great designer!I fell so surprise when visit the link
which is offered by Mr.Upupa Epops,thank you two!
here is PMA's "mosfet power follower": |
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| DarkHorse |
here I have draw a circuit same as PMA's,but it's not easy to
regulating the out point voltage to 1/2Ucc,maybe need a high power resistor to help..perhaps,I will build it next..
and I will not give up with"3W Pure Class-A AMP",very eager to
do something for it (lastest version is 4W)now..
:hot: |
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| Upupa Epops |
| This distortion is too high, later you will be not satisfied with him ;) , belive to " old tomcat " :cool: . |
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| DarkHorse |
| quote: | Originally posted by Upupa Epops
This distortion is too high, later you will be not satisfied with him ;) , belive to " old tomcat " :cool: . |
ahaha..OK,I trust you that the 14W class-A amp's distortion is too high(full output state)!I will consider let this project push rear!
at present,I will do 4W class-A amp first..
as a young man,I need more experience in DIY practice!
have fun!
WINCO
:D |
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| Upupa Epops |
| 4 W are for ...., it is only to the bedroom, not for serious listening :cool: . |
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| DarkHorse |
| quote: | Originally posted by Upupa Epops
4 W are for ...., it is only to the bedroom, not for serious listening :cool: . |
:smash:
yes,4W(RMS) seems too low today,I want to build this low power
amp just for proof my idea.
and I have several 3inch full frequency loudspeaker(SONY joint-stock unit,4ohm,20W),sensitive seems OK,series-wound two is 8ohm,haha..it is so cheap($2 each):
;) |
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| destroyer X |
I have here, a Sony speaker, made of plastic, and they are using those speakers...my God!
The small ones beat, not in volume, but in quality, all i have related home systems here...those you buy in shops, not hi end amplifiers and hi end speakers...i am talking those Systems...with CD, FM Radio, and sometimes with cassette decks...those are disappearing, those cassete decks.
Also, it can reproduce 30 hertz, and sounds very nice...will depend the speaker tune.
My speaker size are
25 centimeters large
25 centimeters deep
30 centimeters high
Has two tubes inside, tuned ducts, 2 inches diameter and 20 centimeters long...one from front panel to back panel, and the other from back panel to front panel.
The small Sony System that use it is some 10 RMS each channel boom box, have reinforced bass.
But i tested those speaker with other amplifiers, and always sounding very nice....and with big bass...believe it or not!
regards,
Carlos |
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| DarkHorse |
hi,carlos:
your sound box is so magic!is it using 3" SONY unit?
and how much 3" unit per box?
I have a crazy idea:build a sound box using 8 PCS unit which I have Posted earlier!and it's sound quality will be more stronger than using only one unit.and can load more power,oh..I dreaming ..
regards,
WINCO
:D |
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| DarkHorse |
hi,dear DIYer:
I will work on with this updated schematics: |
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| Upupa Epops |
| God bless the Earth, if all Chinese start make amps with this efficiency ;) . But seriously : look around, exist many better connections :cool: , think on Gaia. :cool: |
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| DarkHorse |
| quote: | Originally posted by Upupa Epops
God bless the Earth, if all Chinese start make amps with this efficiency ;) . But seriously : look around, exist many better connections :cool: , think on Gaia. :cool: |
hello,Upupa Epops:
a long didn't take with you,are you join to green peace^@^,
many chinese not like me---with a little crazy dream...
but,I think it is so fit to me,except it's low efficiency...hohoho
it expense 64W each channel,stereo just about 130W,lower than ZEN2(72W~80W/per channel),of cause it's output power not much as ZEN2(10W)...
happy everybody!
WINCO |
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| destroyer X |
Age....so.... as we are working in hi top level quality systems...to use in our bedroom... near our ears.... a very serious place, the bedroom, as Human kind was produced there Epupa.
And we do not need power..... we want to hear alone...without disturb neighboors.... 3 watts is wonderfull, as we (mankind) are already researching direct inputs to brain....hehe....some picovolts.....your power will be used to flash lamps only, as a heater or someone heavy to keep the door open in a terrible windy day...to avoid door slamp you will use those big machines near future only to keep doors openned.
Also, Japanese and all Asiat tigers (the Masters of the Universe) ,created the drifting... to put automobile to skid over some special track...to burn tires....and those cars need to be ballanced in weigth..... the big amplifiers will have utility there also....to create some weigth ballance.... to avoid some rear tire loose contact with pavement.
We are in a new world man!.... class D arrived.
Man is going to Mars.
Uncle Sam already show real face
Chinese will be the biggest power in earth
And we will go to dance Samba watching US wars on TV
ahahahaha....today i am very bad....yeah!...real bad!
regards,
Carlos |
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| Jennice |
Hmm... an audio grade room heater..:rolleyes:
This is getting interesting. |
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| DarkHorse |
be happy!Mr.Carlos:
thinking some pleasure screen...and you will be comfortable...YES,JUST DO IT!
regards! |
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| Upupa Epops |
To Winco : Don't take as example Zen, it is stove, where sound is waste product of heating :D . Try to find for example schematic of Accuphase A 20 V, if you need realy good amp in class A. Yes, it is little bit more complicated, any two transistor " miracle ", but efficiency have cca 30 % and sound is superb. :cool:
To Carlos : Space is in human perception " analog ", so let class D to musicians :D , they like light machines. |
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| DarkHorse |
hello,Dear Upupa Epops:
do you have the schematics of "Accuphase A 20 V",if you have please post to me and I will reference it's topology...
thank you first!
WINCO |
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| Upupa Epops |
| I haven't it in electronic form, only on paper. Try to ask other guys :cool: . If you will look at their pages, principial schematic will be there surely. :cool: |
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| destroyer X |
Your plug angle is interesting Guand Dong.
Carlos |
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