| mod_evil |
Hi friends, see this... I mount this, and the sound like so GOOD!
What the others Transistors I can test in the OutPut? Can I put a 2n3055 and 2n2955?
Check the Schematic please! |
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| destroyer X |
Aonde você achou esse danadinho?
Where did you did you find this pretty one?
I love those simple schematics...unfortunattelly they use to be very deceptive in sonics.....
Eu adoro esses esquemas simplórios, mas é pena, êles costumam ser bem ruizinhos.
Maximum voltage swing use to be 1/4 of supply voltage...and the voltage i am talking about, is the voltage under severe conditions with load sucking maximum.
A maxima tensão de saida, costuma ser 1/4 da tensão de alimentação, e dessa voltagem que estou falando, é aquela que você mede sob condições de máximo consumo.
And also use to distort before reach this small voltage.
E ainda gosta de distorcer antes de alcançar esta pequena voltagem.
The output electrolitic condensers must be very big to transfer 20 hertz to 4 ohms speakers
Os eletrolíticos de saída precisam ser bem grandes para transferir 20 ciclos quando você usa alto falante de 4 ohms... 10000uF
But i loved to see your schematic...thanks.
Mas adorei ver teu esquema...obrigado.
Bom encontrar você de novo.... já tem mais de dois meses que não tenho contato contigo.
Good to meet you again.... there are more than two monthes that i had no mails from you.
Carlos |
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| destroyer X |
And despite bigger capacitors, it is loosing some around 20 hertz.
Well...this is what i found using Simulator...real world may be very different.
Good luck, and inform me if you produce it.
Use TIP142 and TIP147 to output...they are a little bit better and will be alive if you find problems constructing it.
regards,
Carlos |
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| henkdeleeuw |
2N3055 and 2N2955 will not work directly; the transistors need to be darlingtons. You can make a discrete darlington by putting a medium-power transistor in front of the 2N3055/2N2955.
Henk. |
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| mod_evil |
Hi Carlos, my friend boutght the kit and send to me the schematic. The many peoples sell this kit in "Mercado Livre" and others eletronics shop.
The site of the manufacturer is this http://www.comkitel.com.br/ . And the Price... Very Very very Low! Around R$35! ( without the transformer and the power supply ) :D
I have a schematic in a High Quality, i send to your email, okay?
Is This a Class-A Schematic? Can you speak to me the power, with 35v 2A or 4A power supply? Can you improve this amplifier?
Oi Carlos, meu amigo comprou este kit e mandou para mim seu esquema. Muitas pessoas vendem ele no "Mercado Livre" e outras lojas de eletronica
O site do fabricante é este http://www.comkitel.com.br/ . E o preço.. Muito Muito Baixo! Por volta de R$35! ( sem o transformador e fonte )
Eu tenho o esquema em alta qualidade e vou enviar para o seu email, okay?
Este é um Class-A esquema? Você pode me dizer a potência dele em uma fonte de 35v 2A ou 4A? Você pode melhorar este amplificador?
Foi muito bom te rever denovo!
Abraços, Felipe. |
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| ChocoHolic |
Hi Evil !
Carlos' proposal for Tip 142 & 147 is fine.
But 2n3055 and 2n2955 will not work properly,
because they are no darlington transistors.
Missing current gain would result in to much load for the
VAS and at least the positive output swing would clip early. ==> Heavy distorsion at higher listening levels. Furtheron your idle current setting would have to be readjusted.... better stick to darlingtons in this circuit...
Have fun
Markus |
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| mod_evil |
Hi Mr. ChocoHolic!
I don't like music in the high levels :D How many power this amplifier produce in 4ohms? :D I using 35v 2A, but i can put more 2A |
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| destroyer X |
Will think about power increase...but i think already exist something interesting made by Rod Elliot....El Cheapo.
Chocoholic:
Wo ist der frau?.... were's the people.
Happy to met you again Markus.
regards,
Carlos |
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| destroyer X |
Can be very problematic.
Na verdade, em verdade vos digo, porque é verídico e tem tudo haver com a veracidade...é vero!
In the true i will say...because it is truth.
Esses "descabelados" dos Darlingtons são chegados à oscilar e a se auto destruir...para evitar, temos que usar enormes capacitores entre base e coletor...daí o som fica chôcho!
Those damned, those Darlingtons, are very easy to start oscilation, that will end with their own destruction, to avoid this,we have to take care with board dimensions... copper lines length must be reduced and big capacitors will be needed between base and colector (around 680 picofarads)...the result is that the sound turns something "without taste!".
Eva told that...the capacitor...and what Eva say, is something alike law to me...as the girl is alike an Electronic Enciclopedia.
Quer ser feliz...procura o esquema padrão do AKSA e monte...cá pra nós.... é muito bom mesmo!... falado amizadinha?...na boa mesmo a sugesta.
You can find better schematics to assemble....but if you want this one...go ahead man!... have you understood the message my dear friend.... really, talking true...that belongs to truly things...in the name of the truth!
regards,
Carlos |
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| mod_evil |
| quote: | Originally posted by destroyer X
Will think about power increase...but i think already exist something interesting made by Rod Elliot....El Cheapo.
Chocoholic:
Wo ist der frau?.... were's the people.
Happy to met you again Markus.
regards,
Carlos |
Hi Carlos!
I seeing El Cheapo, and i like the design of this. But... I will mount the DoZ :D To drive my Bravox PM5 units!
Regards, Felipe. |
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| destroyer X |
This is more delicious together than Strawberries and Cream!
Gooooood!
regards,
Carlos |
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| mod_evil |
| Carlos, Aksa! The animal! Have Symetrical Supply :( And... Can I put the negative voltage of the Aksa in Ground? I dont have money to mount the negative power supply in Now :( |
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| destroyer X |
our forum..
The wire you can remove from your computer stabilizer...some 220 to 110 volts transformer...dismount it and you will have the wire you need.... some 500 watts unit.
And make it by yourself.....hehe...do it by yourself... as many guys did, with sucess.
Não perca mais tempo amigo...bom e barato pra montar...só mesmo o AKSA....mas não vai ter o mesmo som do original, mas dá pra quebrar o galho.
Do not loose your time, as you can have something good and cheap...but will need simetrical supply.... will not sound as the original, but will make you happy.
This represents two wires beeing coiled together...just that...search for that in our forum...i already published detailed informations about that ....and other did it too.
Use our forum man!
regards,
Carlos |
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| henkdeleeuw |
There is another way to produce a symmetrical power supply from a single-ended transformer:
Connect one end of the transformer directly to ground.
From the other end of the transformer, connect one diode to the positive rail, cathode to transformer, anode to +rail, and one diode to the negative rail, anode to transformer, cathode to -rail.
This setup has some drawbacks:
As this will recitify both rails with only 50 Hz instead of the 100 when you have a transformer with a split secondary, you will see more ripple on the supply rails.
Therefore, it is good to use supply capacitors that are larger than you would otherwise use. And of course, you will now need two separate supply capacitors (for positive and negative rail), compared with only one for a single-ended supply.
Also, the ripple on positive and negative rails comes now shifted in time.
First, + will rise on the positive half of the sine, then - on the negative half.
But if you have only a single-ended transformer, and want to test an amplifier that needs symmetric power supplies, I think this is the easiest way to do it.
Succes! Henk |
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| ChocoHolic |
Hi Henk!
I assume that you mixed pos and neg rail (or cathode/andode).
Also we should tell mod_evil should that your arrangement does not
only generate +/- rails, furtheron the overall output voltage will double.
Means if his transformer+diode bridge+ caps would normally result in
35V, then your proposal will give him +/-35V (unloaded).
...circuit might have a less relaxed opinion on that....
Nevertheless your proposal is a circuit that often prooves perfect results as long as you don't need high average power.
For high average power it is less convinient as the resulting current peaks in the diodes and the electrolytic caps are comparatively high.
Hi Carlos !
Your question
"Chocoholic:
Wo ist der frau?.... were's the people."
...is really quite private - but your way to adress our private topics
gives much more to this forum ;) :cool:
She is fine ! :D |
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| mod_evil |
Hi All!
Carlito! Please unblock my email in your email! I have a questions to you!
I thinking to buy other 24VAC transformer to make a negative supply for AKSA! But... In now I making a DoZ, when I finish it i think to assemble others amps, Okay? :dead:
Thanks in advance for the help! |
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| destroyer X |
Because paid sites visited...i did dennie my association, and they are trying to convince me.....hummm, i think they will turn tired.
Hello Chocoholic..... hehe...good to listen you.... love is wonderfull, and she is near you.... what do you think to make a travel?
Henke post some good idea, may be usefull...what do you think.
regards,
Carlos |
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| p robertson |
| In this simple amp the 4.7uF bootstrap cap should be increased to say 47u,and the comp capacitor reduced say to 22pf.I'm sure this will improve the bass and trble response. PETE.:D |
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| destroyer X |
I feel good with your contribution to us.
Please, go ahead, and search for more brazilian models to show our friends.
Acho muito legal a tua iniciativa..parabéns....i really apreciate your movements..congratulations.
Carlos |
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| mod_evil |
Peterson,
I will test it on this Sunday :D , I will post the tests in here...
Thanks for yuour contribuation! |
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