quasar amplifier by dr bora 1000 watt

andrewlebon · 23rd October 2008, 12:38 AM

dear sir
greetings every one at diy i am a new member but under
moderation iwanted to know if anyone has constructed quasar
1000 watts @4 ohms i made legend stsage master 500 watt @ 8 OHMS
HAD NO PROBLEMS GOOd sound easy to make now ready to make
quasar as suggested by maibasicradan location bajaluka and victor
1986 does any PCB pattern exists wanting some feedback on sound
quality power any special tips while assembling it hope any one can
help me
andrew lebon

agra india

malbasicradan · 23rd October 2008, 01:35 PM

Quasor is very good

malbasicradan · 23rd October 2008, 04:41 PM

Quasor is very good. no problem
You will need IRFP240 bee same(5%) just like MJE15034-35,
attention offset <10mV and bias 30mA

malbasicradan · 23rd October 2008, 07:42 PM

Sorry!
Dimension pcb Quasor-a 300X75mm.
RV1 offset and RV2 bias.

malbasicradan · 23rd October 2008, 08:52 PM

Schematic Quasor!

black · 23rd October 2008, 08:54 PM

schematic pliz

viktor1986 · 23rd October 2008, 09:03 PM

You can find schematic on his web site...

http://bas.elitesecurity.org/mojiprojekti1.html

ostripper · 24th October 2008, 05:23 AM

Quasor is the closest jagodic has gotten to the original
doug self "blameless" design.

I built the BJT version of this and it is the most transparent
amp one could imagine, most distortions are nearly
immeasurable unless you have 5000$ test equiptment.

A most rewarding project that will dazzle you with its
sound and is more refined than the quasi NMOS amps.

boraomega · 24th October 2008, 09:46 PM

Thank you "ostripper" for nice oppinion about amp. It is very clasic topology and according to Radan, it is performing excelent.

One correction: name of that design is QUASOR and not QUASAR!

ostripper · 25th October 2008, 05:20 AM

Hey, Boraomega, one question .., why the irf510 for VBe??
I,ve never seen fet used for this.

I use the standard BD139 VBE, but I use BJT OPS.

The only mods other than that I use LED or precision voltage
source IC with buffer for CCS and mine runs on +-60V
without the cascode. But it sounds MUCH better than
junk sony or JVC amps and I get 150W/250W 8/4 ohm.

Very reliable circuit tolerant of most mods..

23rd October 2008, 12:38 AM	#1
andrewlebon diyAudio Member Join Date: Feb 2008	quasar amplifier by dr bora 1000 watt dear sir greetings every one at diy i am a new member but under moderation iwanted to know if anyone has constructed quasar 1000 watts @4 ohms i made legend stsage master 500 watt @ 8 OHMS HAD NO PROBLEMS GOOd sound easy to make now ready to make quasar as suggested by maibasicradan location bajaluka and victor 1986 does any PCB pattern exists wanting some feedback on sound quality power any special tips while assembling it hope any one can help me andrew lebon agra india

23rd October 2008, 09:03 PM	#7
viktor1986 diyAudio Member Join Date: Jun 2005 Location: Belgrade, Serbia	! You can find schematic on his web site... http://bas.elitesecurity.org/mojiprojekti1.html __________________ Pa mislim sta reci!

24th October 2008, 09:46 PM	#9
boraomega diyAudio Member Join Date: May 2005 Location: Cacak, Serbia	Thank you "ostripper" for nice oppinion about amp. It is very clasic topology and according to Radan, it is performing excelent. One correction: name of that design is QUASOR and not QUASAR! __________________ If you are arguing with an idiot, first make sure that he is not doing the same thing.

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23rd October 2008, 01:35 PM	#2
malbasicradan diyAudio Member Join Date: Mar 2008	Quasor is very good

23rd October 2008, 07:42 PM	#4
malbasicradan diyAudio Member Join Date: Mar 2008	Sorry! Dimension pcb Quasor-a 300X75mm. RV1 offset and RV2 bias.

23rd October 2008, 08:54 PM	#6
black diyAudio Member Join Date: Dec 2006	schematic pliz

24th October 2008, 05:23 AM	#8
ostripper diyAudio Member Join Date: May 2008 Location: Albany , NY (smallbany)	Quasor is the closest jagodic has gotten to the original doug self "blameless" design. I built the BJT version of this and it is the most transparent amp one could imagine, most distortions are nearly immeasurable unless you have 5000$ test equiptment. A most rewarding project that will dazzle you with its sound and is more refined than the quasi NMOS amps.

25th October 2008, 05:20 AM	#10
ostripper diyAudio Member Join Date: May 2008 Location: Albany , NY (smallbany)	Hey, Boraomega, one question .., why the irf510 for VBe?? I,ve never seen fet used for this. I use the standard BD139 VBE, but I use BJT OPS. The only mods other than that I use LED or precision voltage source IC with buffer for CCS and mine runs on +-60V without the cascode. But it sounds MUCH better than junk sony or JVC amps and I get 150W/250W 8/4 ohm. Very reliable circuit tolerant of most mods..

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