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Old 25th April 2007, 10:41 PM   #1021
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Mucho gracia senior

Gaetan
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Old 26th April 2007, 10:20 AM   #1022
Nordic is offline Nordic  South Africa
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I am crazy angry right now... The mudderfudgers at plitron are still twidling their thumbs, one office blameing the other, with nothing being done... I have had to phone so many times the girl at the switchboard knows my voice allready...

Finaly spoke to sales manager today who then got the branch manager to phone me... handy experience haveing worked in large corporate world before.... So here we are waiting again, while everyone listens to their DXes... Oh well at least I'm getting a good discount now.

Is it just the two trimpots I need to adust to run with the 25V AC transformer instead of 24V one...? I'm am so gatvol (fedup) I can throw up... If I can find 2 large enough resistors and some extra thermal compound, I may just test the ******* thing with my GC transformer for real...

Bad weather not doing much for my back and mood either...
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Old 26th April 2007, 10:37 AM   #1023
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Default Do not worry about me dear Nordic...the amplifier was tested in this forum by Klaas,

so, it is checked and passed.

I am not eagger to see your amplifier running.

You can use the time you need, and to wait the parts you want.

I just cannot understand why you cannot( and you could not during last three weeks) solder three wires from your chip amplifier supply and put Dx amplifier to work?

This is extremelly strange to me, as i am fast as a ligthning, and now i days i would be constructing the twentieth amplifier counting the Dx amplifier as number one, the first......

This is your decision, as Klaas and i have already suggested that, and it is extremelly obvious that other supply will give the needed electrons to the amplifier... i have to accept your decisions, but i cannot understand them.

Also Dx amplifier can work from 15 volts to 40 volts without too much modifications,...only the offset adjustment and bias adjustment.

Maybe you have decided that this transformer you are waiting for... that this one, this unit in special, is the Dx amplifier power transformer....well...it is up to you to decide that the Chip amplifier transformer do not bellongs to the chip transformer anymore, and decide to call it as the Dx amplifier power transformer and use it... at least while you wait those folks to send your parts.

That transformer you have ordered ,did not born having Dx as family name, nothing will be write above telling that will provide energy ONLY if installed into Dx amplifier..... every source of voltage and current..every DC symetrical will be good to drive the amplifier into sonics...maybe not so good as the transformer you have ordered, but will produce music for you.... even with smaller power and more distortion because of the transformer used.

Man...turn yourself more flexible...life will be easier to you Nordic.

regards,

Carlos
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Old 26th April 2007, 10:49 AM   #1024
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LOL Nordic,

Sounds as if there is so much heat coming off you at the moment you'd attract lightning out of the rain if you went outside.

Sure all the best things are worth waiting for anyway.
Will think about you when I crack a can open today -

Cheers ....... Graham.
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Old 26th April 2007, 10:52 AM   #1025
Nordic is offline Nordic  South Africa
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Lol Carlos, mostly fear keeps me working slowly, when I end up building something I don't understand I tend to go find out what I don't before I power up... I am scared of damageing the other transformer and then I have nothing, my wife would beat me, and I would have to keep her entertained until a new transformer is found...

It is so depressing, for weeks now, I am looking at my completed circuit board without the guts to plug it in and play...

I'm a poor man, blowing up parts is not something I can easily afford...

P.S. Thanks Graham, nice to see you are still with us...

Oh and Carlos, you are right about how my mind works about the transformers... stupid realy, I will get and and beat myself up just now, when my coffee is done...

Also out of dumness I thought for a long time the amp is class A and would draw 5A continuous, which would probably kill my transformer if I had to guess...Now I understand the biasing stuff a bit better I see that is only Peak at peak, but that low volume or no signal is only 50 to 100mA per channel... Took very long to sink in , but my mind finaly grasped this while I was working on Greg's project with the relays which is now on the 6th PCB/circuit version...
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Old 26th April 2007, 11:11 AM   #1026
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Default hehe...you have some "ritual" in your life.


related your wife...replace her by another one less strong...or much better, replace the 36 years old one by two others having 18 years old.....

Life will turn better with young girls around.....no!...negative, you do not need stay too much distant from the old wife....you can tell that you change religion, and some of them accept multiple wive.

Smaller womans, in size, will not produce big punches, but they can bite you.

You will need to know the girls secret...the problemis that they talk too much...you have to find her "mains plug"...and removing from the outlet they will stop talking finishing with a nice decay of speed in her speach sonics..the same you have when you remove mains from a turntable.....aahahahahah

I will send you the Ianomani indian music to call rains and to protect ourselves against lighnings.... singing that, no transformer will burn around....hehe.

- "Dx amplifier, the only one that carries "big magic" with it"

Marketing department...number E-0357574763847348.

regards,

Carlos
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Old 26th April 2007, 03:26 PM   #1027
ostry is offline ostry  Poland
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Hi Carlos, when i read your post about women, only one thing came to my mind:

self made dx amp PCB - 2$
parts and components - 30$
transformer - 300$
Destroyer X advices - Priceless

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Old 26th April 2007, 04:14 PM   #1028
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Default Ahahaha...fine!..but i was kidding, despite the idea was not bad


We love our old wives...reason why is hard to follow what is the best thing to do...hehehe.

As i use to say...theory is one thing, practice is another.

regards,

Carlos
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Old 27th April 2007, 02:23 AM   #1029
BillH is offline BillH  United States
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Hi, all.
I've been following Carlos' DX thread from the beginning and decided to build a pair for myself. I'd like to try something a bit different and use some parts I salvaged from a Sansui SA-500 receiver. The picture shows a fairly large heatsink, 32-0-32 vac transformer, a pair of 10,000uF capacitors, two pairs of 2SC1913 and 2SA913 driver transistors, two pairs of 2SB541A and 2SD338A output transistors, all salvaged and a pair of slightly modified circuit boards from the DX web page. I don't think I'll use the capacitors or driver transistors for this amplifier.

There's not a lot of information on the net on the power transistors. About all I could find was cut and pasted from here: The 2SD388A is an NPN type (110V, 8A, 80W). Types to compare for sub are 2B3442, 2SD551, 2SD732, MJ15001. The 2SB541A is the PNP complement. Types to compare here are 2SA981, 2SA982, 2SA1141, 2SB681.

The original receiver was rated at 55 watts/channel so I don't expect this to be a high powered amplifier, hopefully just a good sounding amplifier. I can always find a use for another one.

The transformer has a higher voltage and the output transistors have lower power dissipation than the DX amp specs. Should I be worried about burning transistors and a room full of magic smoke? Will a VBE multiplier on the heat sink save the day?

I need to order parts this weekend, then drilling, soldering, bending, tapping...good times ahead.

Edit: A question for the group. What is the name of the spade terminals used for the power and speaker connections on Greg's PCB? Extra credit given for a Mouser or Digikey part number.
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Old 27th April 2007, 06:49 AM   #1030
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Hi BillH,

I'll leave it to Carlos, the parts substitution king, to help you with parts selection. The parts specified by Carlos are only a few dollars Digikey, mine just arrive today.

This is were I buy my spade terminals from:

http://www.altronics.com.au/index.as...rch&option=and

Happy building.

regards
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