QUASI Amplifier for Beginners

[vedmitraa]

Mr. Lelut, P.c.b. from your design

Mr. Lelut,P.C.B. from your design, where is the component list and circuit

 

[lelut]

Mr. Lelut,P.C.B. from your design, where is the component list and circuit

Yes that the good question sir,
this layout create using sprint layout v5, first time i'm using this app,
i'dont know how to label components automatically,
i'm check manually back to schematic when put the components,

 

[PetruV]

How many pairs of 2n3055 will get me 400w or so since 2n3773 are expensive,or any other good transistors that will do this

 

[djk]

400W into what impedance?

The forward-biased voltage limit is only 60V, so you will need to build a bridge amplifier to get any real power.

Three pair per each half of the bridge on ±30VDC should do what you want. You will want an output triple to bet enough current gain, use another pair of 3055s as drivers, and TIP41C/42 or similar for pre-drivers.

 

[PetruV]

400W into what impedance?

The forward-biased voltage limit is only 60V, so you will need to build a bridge amplifier to get any real power.

Three pair per each half of the bridge on ±30VDC should do what you want. You will want an output triple to bet enough current gain, use another pair of 3055s as drivers, and TIP41C/42 or similar for pre-drivers.

250-500wats at 4 ohms,maybe 2 ohms but i only want to use only one speaker a big one

 

[PetruV]

I think ll go with 2sc5200 maybe 3-4 pairs idk ,but i need a layout

 

[PetruV]

Here is pcb for BOS100 which is attached by Apex.
Which transistors can i use instead of BC639 and 2N3773

Tnx

Hi you can use 2n3055 as apex said but it wil yeld less powere and also you can use mje 340 350 from what i remember.
Have a nice day and a lot of luck building it

 

[PetruV]

any cheaper 2n3773 alternative

 

[PetruV]

After more research i have foundthe 2n3773 cheaper'But not cheap enough and the 2sc5200 is cheaper and i heard its better soundinf so im going to use that
But i need pcb

 

[vedmitraa]

Mr. Lelut still waiting for schemetic and component values of your p.c.b. design

 

[wakwakni]

PCB by drowranger

Has anyone tried this pcb by drowranger?


http://www.diyaudio.com/forums/solid-state/167394-quasi-amplifier-beginners-43.html#post2628047

 

[wiljj78]

Diode and Caps Value

Hello Mr. Mile,

What's the value of those caps and diodes?

Regards,

 

[apexaudio]

Hello Mr. Mile,

What's the value of those caps and diodes?

Regards,

All components values on this pcb layout are wrong, use schematic from post #1.
Regards

 

[wiljj78]

All components values on this pcb layout are wrong, use schematic from post #1.
Regards

Ohh ok thanks for the info.

Regards,

 

[PetruV]

How good is this compared to apex b500,is this a very big loss im quality compred to b500

 

[PetruV]

what are the cap voltages,is there any layout for 2sc5200

 

[PetruV]

ITS NOT NEEDED ANYMORE i have settled on the h900 or b500 with step driver

 

[yehan]

Apexb 550

Hello all!
This is the image amplifier!!!
Cheers

In picture they use complementary 1943 and 5200 is it ok because in schematic only 2n773, 8 pcs.

 

[yehan]

Can i used the complementary c5200/a1943 for the output stage? Thanks

 

[yehan]

any help pls give me a schematic of 550B used the complementary c5200/a1943 for the output stage? Thanks