Brazilian Amplifier KIT PL2050... Analisys It!

[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!

[mod_evil]

Other Attach

[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

[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

[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.

[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 )

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.

[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

[mod_evil]

Hi Mr. ChocoHolic!

I don't like music in the high levels How many power this amplifier produce in 4ohms? I using 35v 2A, but i can put more 2A

[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

[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