QUASI Amplifier for Beginners

[joka22]

here you go

 

[krachkiste]

(65v)²/2 / 4r = 528.125w

 

[djk]

So you have a regulated supply, and an amplifier circuit that can swing rail-to-rail with zero loss?

 

[krachkiste]

my point is, what do you assume to get from a +-65V supply to the 2xxW at 4Ohm load.

This seems a little too low to me even when you also take output swing and rail "breakdown" into account, and I want to understand how you got to this figure.

 

[apexaudio]

If you can have PSU without voltage drop with full output power, you can get 120Vpp or 42vRMS output voltage with +/-65V DC rail voltage. That will be 225W/8R or 450W/4R with 1% THD, or 300W/4R with 0,1% THD like CROWN DC300 with 1,5kW transformer. Power is not important, this amplifier give great chance for begginers to made functional amplifier.
Regards

post #59

 

[krachkiste]

ah, thanks apex.

 

[joka22]

so anyone interested in swapping?

 

[rhodrich]

sir apex,

do you have a design of simple amplifier that can be used to drive a sub on 4 ohms load at 2000 watts and dont have a step driver?

 

[djk]

Without a step it would require 40 of MJ21196 outputs, two of the basic design (bridged, 20 per half amplifier) and running on about ±95V. Doubling up on the drivers will also be needed, and most of the smaller transistors (including the drivers) will need to be changed to higher voltage types.

I would consider a stepped supply, six pair of MJ21195/96 on the lower rails would be adequate for 2KW/4R.

 

[rhodrich]

Without a step it would require 40 of MJ21196 outputs, two of the basic design (bridged, 20 per half amplifier) and running on about ±95V. Doubling up on the drivers will also be needed, and most of the smaller transistors (including the drivers) will need to be changed to higher voltage types.

I would consider a stepped supply, six pair of MJ21195/96 on the lower rails would be adequate for 2KW/4R.

djk

135vdc supply do you have a schematic for 2kw at 4 ohms

 

[apexaudio]

sir apex,

do you have a design of simple amplifier that can be used to drive a sub on 4 ohms load at 2000 watts and dont have a step driver?

Do you considering to use class D for sub amplifier?

 

[rhodrich]

Do you considering to use class D for sub amplifier?

no sir apex coz i just want to build it, i dont care how many trannies to put or how big is the psu just home grouwn welding machine tranformer.all i need is just a working amp. pls sir if you have circuit for that i just want to used it for sub used.

thanks alot sir

 

[apexaudio]

no sir apex coz i just want to build it, i dont care how many trannies to put or how big is the psu just home grouwn welding machine tranformer.all i need is just a working amp. pls sir if you have circuit for that i just want to used it for sub used.

thanks alot sir

Useing this amps in bridge with double outputs you can have over the 1000W with resonable THD,
Regards

 

[eesbiboi]

Useing this amps in bridge with double outputs you can have over the 1000W with resonable THD,
Regards

apex...,
sir, considering that i'd be building this amp...how will i configure it into bridge mode???...

 

[apexaudio]

apex...,
sir, considering that i'd be building this amp...how will i configure it into bridge mode???...

You can use this bridge buffer for connect two amps in bridge.
Regards

 

[andrewlebon]

hi eesbiboi
greetings use bridge adaptor from electronics australia only one ic
tlo 72 no extra supply needed supply taken from main power amp very small
pcb
thanking you
andrew lebon

 

[eesbiboi]

You can use this bridge buffer for connect two amps in bridge.
Regards

ok tnx sir,
i guess this is what sir andrew lebon told me about...can this bridge buffer work in any amps???...
tnx...
regards...

 

[apexaudio]

ok tnx sir,
i guess this is what sir andrew lebon told me about...can this bridge buffer work in any amps???...
tnx...
regards...

Yes this is general purpose bridge buffer,
Regards

 

[eesbiboi]

hi eesbiboi
greetings use bridge adaptor from electronics australia only one ic
tlo 72 no extra supply needed supply taken from main power amp very small
pcb
thanking you
andrew lebon

ohhh hi there sir andrew...i guess the bridge buffer sir mile posted was the one you told me about..

 

[eesbiboi]

Yes this is general purpose bridge buffer,
Regards

ok...i guess i'd be keeping this one for future use...
one more thing,
how do i know that an amp is capable of running in bridge mode???...coz there are some that say not all amps can run on this mode...
or they can but not for too long...