Author Topic: gainclones diy anyone?  (Read 384763 times)

0 Members and 2 Guests are viewing this topic.

Offline JojoD818

  • Trade Count: (+147)
  • PinoyDVD Legend
  • *****
  • Posts: 14,558
  • Bring it on!
  • Liked:
  • Likes Given: 57
Re:gainclones diy anyone?
« Reply #150 on: Oct 22, 2003 at 01:01 PM »
joan2,

Can you please give me the contact number of sulimco metals? I am thinking of building plate amps for subs (again). I used to sell plate amps for diy subs and planning to be active again!  ;D

JojoD

Offline joan2

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 310
  • I'm a llama!
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #151 on: Oct 22, 2003 at 04:55 PM »
jojo,
i do not hae the new numbers, but they are right beside the Aranque market, opposite TIP, very near the road, cm recto....

Offline JojoD818

  • Trade Count: (+147)
  • PinoyDVD Legend
  • *****
  • Posts: 14,558
  • Bring it on!
  • Liked:
  • Likes Given: 57
Re:gainclones diy anyone?
« Reply #152 on: Oct 22, 2003 at 09:07 PM »
joan2,

Thanks man! If my "kumpare" doesn't have one in their shop then I have no choice but to get one from suliman.

Cheers,
JojoD

Offline Garp

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 284
  • I'm a llama!
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #153 on: Oct 23, 2003 at 10:54 AM »
Jojod818,

Have you tried TDA7294? What's the feedback on this chip--seems widely available too. Thanks.

P.S. just found out this is what was used for nOrh Le Amp I

« Last Edit: Oct 23, 2003 at 11:04 AM by Garp »

Offline JojoD818

  • Trade Count: (+147)
  • PinoyDVD Legend
  • *****
  • Posts: 14,558
  • Bring it on!
  • Liked:
  • Likes Given: 57
Re:gainclones diy anyone?
« Reply #154 on: Oct 23, 2003 at 02:28 PM »
Hi Garp!

Fortunately we have tried the TDA7294 using a 35-0-35 trafo. I only used the basic circuit in the datasheet and it performed well under rigorous test. Unfortunately, we didn't tested the "High Efficiency Circuit" in the datasheet that uses two different supplies that improves Pdmax as well as the power handling of the overall circuit. I have a friend who did, his from Canada, all I know is that his happy with the results of the high efficiency circuit version.

As for me, the 7294 is worth your time. FYI, another chip that I tried was the TDA7293 (again from SGS-Thomson). It performs well in my 12" DVC Targa sub. Besides, it only cost 300+ in the raon area. Check it out!

More power,
JojoD

Offline joan2

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 310
  • I'm a llama!
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #155 on: Oct 23, 2003 at 07:33 PM »
just got my OPA541/OPA549 gainclones i ordered from TI last week...very fast and hassle free!!!!

Offline rmpmla

  • Trade Count: (+3)
  • Collector
  • **
  • Posts: 447
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #156 on: Oct 23, 2003 at 09:37 PM »
joan2,

thanks for the tip. got my samples OPA541/549 power amp chip today delivered by UPS courier.

now, i need to check for the circuit diagram.  :)

Offline JojoD818

  • Trade Count: (+147)
  • PinoyDVD Legend
  • *****
  • Posts: 14,558
  • Bring it on!
  • Liked:
  • Likes Given: 57
Re:gainclones diy anyone?
« Reply #157 on: Oct 24, 2003 at 12:00 AM »
rmplma,

Just download the datasheet and off you go. BTW, I have tried them chips both inverted and non-inverted, bridged and paralleled. It works fine either way.  ;D

JojoD

Offline rmpmla

  • Trade Count: (+3)
  • Collector
  • **
  • Posts: 447
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #158 on: Oct 24, 2003 at 06:55 AM »
rmplma,

Just download the datasheet and off you go. BTW, I have tried them chips both inverted and non-inverted, bridged and paralleled. It works fine either way.  ;D

JojoD

JojoD,

you've done a neat PCB.   pwedeng bang kopyahin  ;D.
my email : [email protected]. thanks

rmpmla
« Last Edit: Oct 24, 2003 at 07:00 AM by rmpmla »

Offline JojoD818

  • Trade Count: (+147)
  • PinoyDVD Legend
  • *****
  • Posts: 14,558
  • Bring it on!
  • Liked:
  • Likes Given: 57
Re:gainclones diy anyone?
« Reply #159 on: Oct 24, 2003 at 08:38 AM »
I just sent you the foil side of the pcb, good luck!

JojoD

Offline GC

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 340
  • sparc
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #160 on: Oct 24, 2003 at 09:29 AM »
just got my OPA541/OPA549 gainclones i ordered from TI last week...very fast and hassle free!!!!

what's the difference between the OPA549S and OPA549T?  ???

i was about to order samples but i don't know which one to choose between the two.
Pro Deo et Patria

Offline joan2

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 310
  • I'm a llama!
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #161 on: Oct 24, 2003 at 09:53 AM »
if i am not mistaken, 's' is for single in line, while 't' is for the uninsulated version very much like the lm3875, btw opa541 seems to be higher powered than opa549 since the opa541 can operate at higher rails....the to3 version of the opa541 seems to be the best package if you want ruggedness, although harder to mount on a heatsink...haven't found one at diyaudio yet...
« Last Edit: Oct 24, 2003 at 10:01 AM by joan2 »

Offline GC

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 340
  • sparc
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #162 on: Oct 24, 2003 at 09:58 AM »
if i am not mistakes, 's' is for single in line, while 't' is for the uninsulated version....

Thanks.
Pro Deo et Patria

Offline Mika

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 193
  • Hello!
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #163 on: Oct 24, 2003 at 10:52 AM »
joan2,

thanks for the tip. got my samples OPA541/549 power amp chip today delivered by UPS courier.

now, i need to check for the circuit diagram.  :)

my 541 are on its way, via ups (per ti email)  :o :) .

rmpmla,
please update us if you find a simple amp circuit for this baby (yung pwedeng i-build kahit grade one pupil  ;D , newbie ako e.)

thanks,

 8)


Offline Garp

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 284
  • I'm a llama!
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #164 on: Oct 24, 2003 at 11:56 AM »
For samples, did UPS charge you any taxes?

I'm thinking of adding more samples since I might want to make a preamp if I succeed in making the GC. The popular ones for preamp are available as samples like OPA2134, OPA637, OPA2604.
« Last Edit: Oct 24, 2003 at 12:36 PM by Garp »

Offline joan2

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 310
  • I'm a llama!
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #165 on: Oct 24, 2003 at 02:04 PM »
i did not pay any....

Offline JojoD818

  • Trade Count: (+147)
  • PinoyDVD Legend
  • *****
  • Posts: 14,558
  • Bring it on!
  • Liked:
  • Likes Given: 57
Re:gainclones diy anyone?
« Reply #166 on: Oct 24, 2003 at 05:17 PM »
Guys,

S= single in line, T= ZIP11 (yun zig-zag yun pins.)

You won't have to pay anything since there is a TI plant in Baguio City. They also have an office in Muntinlupa that will call you up or send you a letter (if you supplied a wrong tel. number) asking you to explain where you used the samples.
Mika,

Yun pcb na send ko kay rmpmla very simple and uses less components.

Cheers,
JojoD

Offline rmpmla

  • Trade Count: (+3)
  • Collector
  • **
  • Posts: 447
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #167 on: Oct 24, 2003 at 09:46 PM »
I just sent you the foil side of the pcb, good luck!

JojoD

thanks for the foil pattern. :)

rmpmla

Offline rmpmla

  • Trade Count: (+3)
  • Collector
  • **
  • Posts: 447
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #168 on: Oct 24, 2003 at 09:58 PM »
rmpmla,
please update us if you find a simple amp circuit for this baby (yung pwedeng i-build kahit grade one pupil  ;D , newbie ako e.)

thanks,

 8)


Mika,

i will try the pcb layout courtesy of JojoD818. now, i need is the time to build this amp ;D.

rmpmla

Offline rmpmla

  • Trade Count: (+3)
  • Collector
  • **
  • Posts: 447
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #169 on: Oct 24, 2003 at 10:08 PM »
For samples, did UPS charge you any taxes?

wala akong binayarang tax.

actually, i received two packages via UPS. the first package i received yesterday which consist  of 7 types of OPA.  
the 2nd one i received just today 3pcs OPA2544T.





Offline JojoD818

  • Trade Count: (+147)
  • PinoyDVD Legend
  • *****
  • Posts: 14,558
  • Bring it on!
  • Liked:
  • Likes Given: 57
Re:gainclones diy anyone?
« Reply #170 on: Oct 25, 2003 at 12:04 AM »
rmpmla,

My last 541 used that pcb and it works fine. I used it for evaluation purposes though.  :)

JojoD

Offline Mika

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 193
  • Hello!
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #171 on: Oct 25, 2003 at 06:21 AM »
Mika,
Yun pcb na send ko kay rmpmla very simple and uses less components.
Cheers,
JojoD

sir JojoD, kindly send me pcb design also, if possible.   :)

Quote
Mika,
i will try the pcb layout courtesy of JojoD818. now, i need is the time to build this amp .
rmpmla

yes sir rmpmla, excited na ko  :) , just take your time  ;).

thanks for the replies,
 8)

Offline JojoD818

  • Trade Count: (+147)
  • PinoyDVD Legend
  • *****
  • Posts: 14,558
  • Bring it on!
  • Liked:
  • Likes Given: 57
Re:gainclones diy anyone?
« Reply #172 on: Oct 25, 2003 at 09:46 AM »
Mika,

No problemo! Where do I send it?

JojoD

Offline JojoD818

  • Trade Count: (+147)
  • PinoyDVD Legend
  • *****
  • Posts: 14,558
  • Bring it on!
  • Liked:
  • Likes Given: 57
Re:gainclones diy anyone?
« Reply #173 on: Oct 25, 2003 at 09:51 AM »
rmpmla,

What I sent you is the foilside! OK? I will send you another one with the parts placement guide.

JojoD

Offline Mika

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 193
  • Hello!
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #174 on: Oct 25, 2003 at 12:14 PM »
Mika,

No problemo! Where do I send it?

JojoD

alright!!! you're the man sir jojod818.

yohooo!!  :)....
sent you pm

thanks,

 8)
« Last Edit: Oct 25, 2003 at 12:15 PM by Mika »

Offline rmpmla

  • Trade Count: (+3)
  • Collector
  • **
  • Posts: 447
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #175 on: Oct 25, 2003 at 04:30 PM »
rmpmla,

What I sent you is the foilside! OK? I will send you another one with the parts placement guide.

JojoD


JojoD818,

that would be great! :)

i saw your post on diyforum. pareho pa rin ba ang parts  o may nabago na?

rmpmla

Offline joan2

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 310
  • I'm a llama!
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #176 on: Oct 25, 2003 at 05:54 PM »
those of you doing the pcb, you can use shellac varnish after you clean the boards so that it doesn't corrode, copper reacts well with oxygen so that it becomes green after a while....a slight coating will do, for cleaning the boards, you may use 'scothbrite' and pumice powder 'ajax' after washing the boards clean of ferric cholride...

Offline JojoD818

  • Trade Count: (+147)
  • PinoyDVD Legend
  • *****
  • Posts: 14,558
  • Bring it on!
  • Liked:
  • Likes Given: 57
Re:gainclones diy anyone?
« Reply #177 on: Oct 25, 2003 at 10:57 PM »
Hi guys,

I just sent the pcb pattern to rmpmla and Mika. Good luck guys!

PS, just finished a 48dB Linkwitz-Reiley Low Pass Filter for my sub project. Excellent results! As soon as I finish my new prototype, I'll share it with you guys.

JojoD

Offline joan2

  • Trade Count: (0)
  • Collector
  • **
  • Posts: 310
  • I'm a llama!
  • Liked:
  • Likes Given: 0
Re:gainclones diy anyone?
« Reply #178 on: Oct 26, 2003 at 02:07 PM »
here is another tip when doing your heatsinks, make sure to de-burr the holes you drilled to make it flat, you can use a bigger size drill bit to do it, say 3/8, then you can lap your hatsink by laying a 600grit sandpaper on a flat surface, prefferably a glass table top, then rub the mounting surface of your heatsink on the sandpaper using regualr even pressured motion, this will ensure that the chip package will mate evenly withe the heatsink, thus more efficient heat transfer can be achieved...if you want you can clean you heatsinks using a lye solution, half a can in a pail of water would be enough..do this in a well ventilated area such as outdoors, as you immerse your heatsink, a pronounced bubbling will take place, half an hour should do it...you can use vinegar to remove any stubborn stains, but in my experience i never had to resort to this...depending on the strenght of the solution and the soaking time, you can have a silvery matt finish....take care!!!!

Offline JojoD818

  • Trade Count: (+147)
  • PinoyDVD Legend
  • *****
  • Posts: 14,558
  • Bring it on!
  • Liked:
  • Likes Given: 57
Re:gainclones diy anyone?
« Reply #179 on: Oct 26, 2003 at 03:32 PM »
Hi,

Follow up lang sa tip ni joan2, you can use muriatic acid (gamit sa cr!) for this. Either way, you have to wash the heatsink well after soaking.

Another ingenous way of heatsinking is to use old pc cpu heatsinks with fan! I've tried this before and yields excellent results!

NOTE: Be very CAREFUL when HANDLING CHEMICALS!

JojoD