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andrewlebon 23rd October 2008 12:38 AM

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:whazzat:

malbasicradan 23rd October 2008 01:35 PM

Quasor is very good

malbasicradan 23rd October 2008 04:41 PM

2 Attachment(s)
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

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

malbasicradan 23rd October 2008 08:52 PM

2 Attachment(s)
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...

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..:D :D

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