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Old 9th November 2012, 06:52 PM   #871
nuwan is offline nuwan  Sri Lanka
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Quote:
Originally Posted by 44250 View Post
what power and impedance rating are those speakers that you have? HV23 and HV350 will give you 240W/8r 350/4r and they would be just fine for monitors(midbas-middle-high) and APEX 50-500W is simple,relatively cheap and very good amplifier for full range-so for woofer it would be great. HV23 and HV350 are ab-class amplifiers and for full stereo power you will need good psu with 1kVA transformer,2 x 10000uf of capacitors at least,and heatsinks with fan cooling:than you will have a beast of an amplifier.
APEX 50-500W is b-class amplifier so it is not heating that much,but it still needs a proper heatsink(s), at least 1,3kVA transformer with about 2x 15000uF of capacitors.
The diference between diy and commercial amp? DIY if proper done (no sparing on transformer and capacitors in psu,heatsinks...) comes more expencive option but because of that it does not "lose its breadth" at peak of its power like most commercial does. If done properly,diy can compeete with even more expencive amplifiers. That is my opinion...
sir
thank you for you'r opinion, really it mean lot to me thank you
all those speakers are 8ohm each woofers 18" 600w, each mid bass 15" 250w, High 50w compression driver, this power rating mention back of speaker magnet, & i don't know this rating weather "peak power of speaker" or "program power of speaker" or RMS power of speaker. this all speakers used ones we brot
thanks
nuwan

sir Apex plz i am sorry.... if i put something off topic to tread.
thanks
nuwan
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Old 9th November 2012, 07:07 PM   #872
44250 is offline 44250  Serbia
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you could use amplifiers almost as i told you-HV23 (or HV350) but with B500. since two from top are probably paralelled they are 4R resistance and HV23 will be at 350W and woofer would go with B500 to reach greater power at 8R resistance.

you have awsome speakers!
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Old 9th November 2012, 07:15 PM   #873
nuwan is offline nuwan  Sri Lanka
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Quote:
Originally Posted by 44250 View Post
you could use amplifiers almost as i told you-HV23 (or HV350) but with B500. since two from top are probably paralelled they are 4R resistance and HV23 will be at 350W and woofer would go with B500 to reach greater power at 8R resistance.

you have awsome speakers!
sir
thank you thank for you'r help thanks
nuwan
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Old 12th November 2012, 03:12 PM   #874
Vostro is offline Vostro  South Africa
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Finally I'm getting some time to spend on my APEX SR200.
I'm using PCB3.1 from ALEX_MM, I've not populated the two 100nF shown.

I've only had it on my bench supply, first limited to 200mA at 30V-0-30V DC.
Then unlimited (which is 5A per rail for my bench supply).
Worked first time with no hums etc. Offset 0.1mV on bench supply, biased at 10mV over 0.33R's.
When I get some more time I'll connect it to my 45-0-45V AC 500VA transformer and have a listen again.
I don't have any bigger transformer at hand.

Thanks again to Apex and Alex.
Attached Images
File Type: jpg SR200_3.jpg (573.8 KB, 850 views)
File Type: jpg SR200_2.jpg (390.0 KB, 763 views)
File Type: jpg SR200_1.jpg (307.3 KB, 679 views)
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Old 12th November 2012, 04:06 PM   #875
44250 is offline 44250  Serbia
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from my mobile it looks so clean and done with a lot of attention,great!
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Old 12th November 2012, 06:56 PM   #876
44250 is offline 44250  Serbia
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Originally Posted by 44250 View Post
from my mobile it looks so clean and done with a lot of attention,great!
look´s even better on my PC ! one of the best done yet!
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Old 12th November 2012, 08:05 PM   #877
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Quote:
Originally Posted by Vostro View Post
Finally I'm getting some time to spend on my APEX SR200.
I'm using PCB3.1 from ALEX_MM, I've not populated the two 100nF shown.

I've only had it on my bench supply, first limited to 200mA at 30V-0-30V DC.
Then unlimited (which is 5A per rail for my bench supply).
Worked first time with no hums etc. Offset 0.1mV on bench supply, biased at 10mV over 0.33R's.
When I get some more time I'll connect it to my 45-0-45V AC 500VA transformer and have a listen again.
I don't have any bigger transformer at hand.

Thanks again to Apex and Alex.
Nice work,
Regards
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Old 13th November 2012, 01:58 PM   #878
Vostro is offline Vostro  South Africa
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First of all, I'd like to know how to rate this thread 6/5 stars.

I've connected up my SR200 to my transformer, set bias at 10mV over 0.33R.

Measured 0.1mV DC offset at output.
Measured 0.00mV AC(rms) on 200mV Digital Multimeter.
NO hiss and no hums etc.

wow wow wow , excellent amp and sounds exceptional, now the best amp I own.

I've designed and built my own Lin type amplifier, and I have to be honest
this amp from Apexaudio, is far far better sounding.

sorry or all the repetitive words, but its that good in my opinion

Thanks again to Apex for amplifier design and Alex for pcb design.

Last edited by Vostro; 13th November 2012 at 02:00 PM.
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Old 13th November 2012, 02:37 PM   #879
wiljj78 is offline wiljj78  Philippines
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Quote:
Originally Posted by Vostro View Post
First of all, I'd like to know how to rate this thread 6/5 stars.

I've connected up my SR200 to my transformer, set bias at 10mV over 0.33R.

Measured 0.1mV DC offset at output.
Measured 0.00mV AC(rms) on 200mV Digital Multimeter.
NO hiss and no hums etc.

wow wow wow , excellent amp and sounds exceptional, now the best amp I own.

I've designed and built my own Lin type amplifier, and I have to be honest
this amp from Apexaudio, is far far better sounding.

sorry or all the repetitive words, but its that good in my opinion

Thanks again to Apex for amplifier design and Alex for pcb design.
Very nice...Congratulation.....
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Old 13th November 2012, 05:25 PM   #880
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Quote:
Originally Posted by Vostro View Post
First of all, I'd like to know how to rate this thread 6/5 stars.

I've connected up my SR200 to my transformer, set bias at 10mV over 0.33R.

Measured 0.1mV DC offset at output.
Measured 0.00mV AC(rms) on 200mV Digital Multimeter.
NO hiss and no hums etc.

wow wow wow , excellent amp and sounds exceptional, now the best amp I own.

I've designed and built my own Lin type amplifier, and I have to be honest
this amp from Apexaudio, is far far better sounding.

sorry or all the repetitive words, but its that good in my opinion

Thanks again to Apex for amplifier design and Alex for pcb design.
Nice work,
Regards
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