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Old 25th October 2008, 06:42 PM   #11
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Location: Cacak, Serbia
Well ostripper, I believe you already answered your own question in another topic (power amp under development):
"The one mod that is interesting in the good doctor's design is
the use of FET as the VBE (Thermal coeff same as MOSfet outputs??)"
…which doesn't mean that it is not possible to make equally good thermal bias control with BJT-s in Vbe multiplier.

Each designer has some preferences regarding particular sub-circuits, sometimes justified, sometimes it is just like that...
As CCS sub-circuit I prefer one of those two given on a picture attached to this post. To my taste, both are giving way better results than any LED based version.
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File Type: gif ccs vers.gif (17.1 KB, 2805 views)
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Old 31st October 2008, 04:10 PM   #12
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Default amplifier working

dear sir
greetings everyone especially malbasicradan for the help
made it on stage master mk 2 pcb its working as you said even
posted picture of amplifier ugly but working can you tell me your
biasing techniqe running it on 75 volts dc 60000 mfd on each rail
have made the softstart circuitand dc protection waiting to wind my
torroidal what was your secondary ac voltage
do ultrafast rectifiers give a cleaner sound what type of load do you
use
1 the 15pf circuit diagram shows it connected tobase of mpsa92 and
collector of mje350 but pcb layout shows it connected from output
to drain pin of irf510 WHICH IS CORRECT will be making pcb from
factory near my house will keep you posted
thanking you
andrew lebon
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Old 31st October 2008, 04:41 PM   #13
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15pf need to be conect to base mpsa 92 and collector mje 350 is corect soryyyyy!
Becouse my english is not so good I dont understand what you say with this( can you tell me your
biasing techniqe running it on 75 volts dc 60000 mfd on each rail
have made the softstart circuitand dc protection waiting to wind my
torroidal what was your secondary ac voltage),please tell me!?
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Old 1st November 2008, 01:12 AM   #14
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Default quasar supply

dear sir

thanks for the prompt reply i wanted to ask you
1 transformer secondary voltage
2 for what do you use it outdoor sound what type of speakers do
you use
3
heat sink used its size
canyou post a picture of it on diy

how did you bias your amplifier bias setting
thanking you
andrew lebon
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Old 26th November 2008, 01:19 AM   #15
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Default quasar diyers

hi everyone
good to see interest in quasar 1000 watt how many diy
are making it can share tips with you all like soft start dc protector
tone controls etc
thanking you all
andrew lebon
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Old 26th November 2008, 05:08 AM   #16
macd is offline macd  South Africa
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Default Building Quasar 1000Watt

Hi All,

I am busy building a Quasar amp. Will post pics later. I am almost finished with the amp. Still waiting for my transformer before I can test the amp. It is close to festive season and everything is am bit slow now. Andrew can you please share your DC protector and softstart circuit with us. I would really appretiate this. Thanks

Macd
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Old 26th November 2008, 07:26 AM   #17
black is offline black  Romania
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picture your amplifier pliz this schematic is very interesing sorry for my englich
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Old 26th November 2008, 11:08 AM   #18
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Default reply

hi macd
good to know you are making the amp did you match the
mosfets well tomorrow i will e mail u the dc protector and soft start
will help u if u need mosfet matcher schematic please i u can post
pictures of your amp bye
andrew lebon
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Old 26th November 2008, 11:28 AM   #19
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Default reply

hi black
greetings well u asked for pictures i did not have any pcb
so i built on dr boras stage master mk 2 pcb added 2 small pcb
and made it work picture is on dx turbo page of destroyer he was kind
en

ough to post it will be getting pcbs made then i will redo the amp
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Old 28th November 2008, 10:00 PM   #20
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Default dc protector surge limiter

hi macd
greetings the dc protector is from edwin paij website only
replace bc 550 bc560 with bc 547 and bc557 if bc550 bc560 is not
available it has a pcb layout very compact circuit works component
easily available surge limiter for transformer is from krell ksa50 clone
amplifier in the circuit diagram use top part of circuit 18 0 18 volt
transformer 1000 mf condenser.015 condenser2.2k 1watt 220k 100mf condenser for time delay mpsa 56 tr and irf 610 tr for operating the relay for mains resistance use 25 ohms 20 watt relay 24 volts dc can
be made on small veroboard do not use relay 2 as shown in circuit
if not happy can e mail u more circuits
thanking you
andrew
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