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Old 26th November 2009, 02:17 AM   #11
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What are you driving ??? (speakerwise) 300 watts is awesome and scary with either music or HT use (movies) on any normal speaker system.

The only speaker I know that could honestly handle a true 1KW RMS is this one AlternativeDVD.com Audiopulse AX12Q1 AXIS 12" Quad Coil Subwoofer 1 Ohm
And it cost $650

Click the image to open in full size.

Try the quasi amps (nmos350/500) or carlos's DX turbo
Power amp under development
This is the DHR.... Dx High Resolution Turbo
Take your time, look around. For a light load, the amp in this thread would work and might even be better than average (OEM) .. but not at 1KW !!
$$$ wise , it is a steal (if the sankens are real ?? )
For good kits , try High End Audio MOSFET Amplifiers

OS

Last edited by ostripper; 26th November 2009 at 02:31 AM.
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Old 26th November 2009, 11:12 AM   #12
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Well its not a matter of what to drive. its a matter of havingfun building it..what about the 4xtda7293 solution? seems better designed to me
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Old 26th November 2009, 01:37 PM   #13
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sifis ...here is a few facts about this amp .....

the amplifier you posted in the first place has a few things on the neg side and some others on the pos side beyond that you may chosse on your own .....

---this is an sziklai issue .... meaning that the amp is
--- more effective than normal EFP amps
--- sonics especially in high frequency is not the best
--- sziklai eventhough more effective also quite dificult to stabilize
--- 470R/5W resistors do that ( stabilize the amplifier since the output stage will act in its own will if let free ) but also the specific resistors are also sonic killers
---at 70+70 volts this circuit will produce about 330-350W @ 8 ohm resistive load @ 1 khz
--- at 4 ohms though even though the circuit will produce 700 W i dont really thing that transistors will be happy with so much power ( i dont have the time to calculate how safe is that )

generally given as a fact that this pcb has good parts regarding quality it will make an excelent sub woofer amplifier that will work happily for years if power demands will not exceed the above specs ....

on the other hand if you want my advice in this levels of power circuit of the amplifier is only 30% of the deal ....the rest 70% will have to be circuits that monitor voltage and curents here and there to guarantee safe operation ....

finally the only diy amp that i ve seen here in the forum that is complete enough
(having allready installed all protection methods ) while producing all this much power is the Dirty Harry made by our Greek member FOTIOS ....

for example also greek made amp Quasi is capable of producing very good ammounts of power eventhough all npn made and simply done but peripherals arround it like VI limmiters and or other protection methods are not there ....

In real life and very surprizingly i have made so far 4 Quasi amps as seen in the Quasi web pages and threads that i use in small Pa applications that is very expected that are going to be abused and none of them failed so far

( as we speak i am working in a LDR based input limmiter to install to them even though it seems that there is no need for that )
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Old 26th November 2009, 02:18 PM   #14
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Quote:
Using high quality SANKEN 5x 2SA1295 & 5x 2SC3264
The transistors in this kit have a 99,99% change to be fake. These kits are also sold in Jakarta Glodok area without transistors as the shops there get to much complaints.

BGR stands for Bogor (Small town near Jakarta) they are Home Industry (or something like that).
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Old 26th November 2009, 02:41 PM   #15
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Quote:
Originally Posted by sayang001 View Post
The transistors in this kit have a 99,99% change to be fake. These kits are also sold in Jakarta Glodok area without transistors as the shops there get to much complaints.

BGR stands for Bogor (Small town near Jakarta) they are Home Industry (or something like that).
yeah i realized that it isnt a smart idea to work with these modules...

but noone speaks about the 4x tda7293 solution..
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Old 26th November 2009, 03:34 PM   #16
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Another nice solution to build a high power amp is to use LME49810 /11/30 driver chip with a proven output stage bjt or mosfet. (max +/-100volts rails.) Quasi output for instance.
Some nice threads on this forum.

Last edited by bobodioulasso; 26th November 2009 at 03:39 PM.
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Old 26th November 2009, 05:01 PM   #17
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IF YOUR TARGET .....is high power durabilty and good sonics simply skip almost any chip design ....also thing again ...the fun of building it ...
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Old 26th November 2009, 05:15 PM   #18
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Quote:
Originally Posted by sakis View Post
IF YOUR TARGET .....is high power durabilty and good sonics simply skip almost any chip design ....also thing again ...the fun of building it ...
Well another point is that i am looking for a ready made module as i dont have any experience in schematics deign or anything around pcb making or designing....i just have completed some diy kits mainly from Smartkit and C&A Electronics..i only have good soldering skills and i believe i can build a fairly good PSU...
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Old 26th November 2009, 08:46 PM   #19
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...sifis ....you have nothing to loose ( hopefully ) by buliding i big machine ...the thing is tha macines like that require instruments ,skills , and a lot of know how especially if some trouble comes up

take one step at the time .... forget both C&A and smart kits thier both rubish and designs of 1821 .... still you can upgrade those with better parts and a few other corrections but there is not much youmay get from them

both C&A and smart kits dont have amps more than real 100 wats ... so go for the "next step " like built a real 150W amplifier or 200 w dont for the kilowatt yet ....give it some time and go one step at a time ....

built a quasi, or go for any design from the ESP pages Rod's designs are very honest produce exactly what they say in their specs , have available pcbs , all that in fair prizes

or go for a P101 mosfet ...a simple amd very nice amp

regards sakis
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Old 26th November 2009, 09:15 PM   #20
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Quote:
IF YOUR TARGET .....is high power durabilty and good sonics simply skip almost any chip design
This is not always true.
Power stage is better discrete, i agree. Ic driver is not a bad choice.
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