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Old 2nd May 2003, 04:57 AM   #11
sangram is online now sangram  India
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Oh, then I'm sorry. If you want a subwoofer amp then the ESP circuit is about the best. I don't think you will get 800 watts into 4 ohms, though - Rod doesn't recommend the circuit for 4 ohm duty in any case, you will have to add more transistors - 2 pairs, to be precise, for Sub amp duty into 4 ohms.

Veroboard will not be difficult. Write to Rod and explain your problem to him, maybe he will drop a few hints. Be careful of the wiring, though. Use heavy guage wires and check the connections twenty times before applying power.

Remember there's no short-circuit protection and since you have so much hardwiring, you may not be able to mount it into the sub as the vibration will surely shake it loose.

If I was in your place I'd have worked with something from the STK series. Anthony (Holton) has worked out some 800 watt and 1000 watt RMS Mosfet amps, in case you would like to build them but they are slightly more complex.

If you have the money and the chip is available, I would suggest picking up 4 STK4048XI and running them in a bridge configuration. You should easily get about 300 watts into an 8 ohm load...

Your English is way better than my Hebrew. Never let it worry you...
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Old 2nd May 2003, 05:04 AM   #12
elizard is offline elizard  Canada
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what about someone buying it for you?
i mean .. i'm sure there's someone that can buy it for you, then ship it out to you, although that'll cost possibly up to $20 more ..
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Old 2nd May 2003, 09:44 AM   #13
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i build it for PA....- DJ

i build 2 channels for subwoofer - 450W RMS x2 4 Ohm

and for normal DJ spek' i will build with 4 STK4050V in bridge....
400W RMS x2 (8-16 Ohm)

it will be 4 channels amp..... very big.... i already buy the parts and the transformers..... i wait that thay come.....

transformer for sub amp..... is 48~0~48VAC 1600VA (40-500Hz)
transformer for the STK's .....is 46~0~46VAC 1000VA (500Hz-20K)
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Old 12th May 2003, 08:51 PM   #14
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Quote:
Originally posted by sangram
Only 3 V/uS is maybe too little....
what the meaning? "3V/uS"
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Old 13th May 2003, 05:22 AM   #15
sangram is online now sangram  India
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Somebody will be able to give the exact technical explanation of this specification.

What I know that the specification is also known as the slew rate - how fast the amplifier is able to swing its output in reponse to input signal.

Generally, the higher, the better - except for the fact that op/amps with very high slew rates also require some amount of stable circuits or else they can oscillate.

The LM chips have slew rates of about 10 or 8 V/uS - which is sort of a 'minimum' for full range audio. 3V/uS, as Rod says on the article, gives full power to 10KHz but that's only under testing. HF distortion becomes a problem specially at higher volumes.

Since you were thinking of a sub amp, that should not be a problem anyway.... So the amp is basically suited to what you want to do with it...
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Old 13th May 2003, 05:29 AM   #16
sangram is online now sangram  India
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For a very technical discussion on slew rate, most of it went over my head but I understand the basic point - the quest for a very high slew rate:

Output stages with gain Enhance Slew rate

looking for 400V/uS !!!
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Old 13th May 2003, 09:10 AM   #17
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Quote:
Originally posted by sangram
For a very technical discussion on slew rate, most of it went over my head but I understand the basic point - the quest for a very high slew rate:

Output stages with gain Enhance Slew rate

looking for 400V/uS !!!

what i need to add to the amp to get 400V/uS or something like that....?
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Old 5th September 2012, 03:28 PM   #18
rahkik is offline rahkik  India
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THIS IS THE BCB IMMAGE OF THE PROJECT P68 300W PA
BU ME.......
PLEASE CHECK THAT DESIGN
!@@#$#$%.......I knoW THAT IS RIGHT DESIGN
IF NT CRRECT i am not responsible for that..........
CHECK IT ON AT YOUR RISK..............Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.

Last edited by rahkik; 5th September 2012 at 03:31 PM.
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Old 5th September 2012, 04:09 PM   #19
Bone is offline Bone  United Kingdom
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Hey rahkik, This thread is ooooooooooold & DjBassAmp has not been here since 2003 Also your pictures are not shown!
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Old 8th September 2012, 02:12 PM   #20
rahkik is offline rahkik  India
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Click the image to open in full size.[IMAGE]
Quote:
Originally Posted by rahkik View Post
THIS IS THE BCB IMMAGE OF THE PROJECT P68 300W PA
BU ME.......
PLEASE CHECK THAT DESIGN
!@@#$#$%.......I knoW THAT IS RIGHT DESIGN
IF NT CRRECT i am not responsible for that..........
CHECK IT ON AT YOUR RISK..............Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.
[image]Facebook[/image]
[image]Facebook[/image]
[image]Facebook[/image]
[image]Facebook[/image]
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Last edited by rahkik; 8th September 2012 at 02:14 PM.
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