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PostPosted: 19 Jul 2010, 12:31 
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Joined: 27 Jun 2010, 15:21
Posts: 59
Location: Europe
dtsup1 wrote:
You pretty much have everything already to build the gainclone... :thumbsup:

ALMOST :P
need to order toroid probably this week..and the way we go assembling 8-)


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PostPosted: 20 Jul 2010, 14:38 
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Joined: 27 Jun 2010, 15:21
Posts: 59
Location: Europe
today started a little bit assembly on PSU part..figured it out one big problem..
WRONG caps :confused:
they forget to give me 0.1uF..and i took 2 pieces 10.000uF too much :eek:
tomorrow i take it back,and get the right one :up:


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PostPosted: 21 Jul 2010, 12:48 
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Joined: 27 Jun 2010, 15:21
Posts: 59
Location: Europe
UPDATE:
PSU part is finished..
i made some measurements to see if everything is working..
the output voltage is jumping about +/-0,05V..i think that's reasonable tolerance..
what do you think?

now just wait probably for a MONTH ,for toroid to get produced..because almost all workers are on holidays :blush:

regards!


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PostPosted: 21 Jul 2010, 16:38 
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Joined: 06 Jun 2008, 18:23
Posts: 5190
Location: Australia
hybrid: Where do you get your power trannies?

And what part of Europe are you from? I'm from Southern Victoria Australia. I've holidayed in France and Italy. Love both.

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Projects:”Image” - Low Profile 100W Class D amp | ”fiih” - 150W Holton inpsired power amp | "Precision" - 300W Class AB Holton power amp | ”Gothic” - FET Push-Pull headphone amp


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PostPosted: 22 Jul 2010, 07:47 
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Joined: 27 Jun 2010, 15:21
Posts: 59
Location: Europe
mwhouston wrote:
hybrid: Where do you get your power trannies?

And what part of Europe are you from? I'm from Southern Victoria Australia. I've holidayed in France and Italy. Love both.

i get them from a small company near me..hope they start working again as soon as possible ;)
i'm from Central Europe - Slovenia!


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PostPosted: 24 Jul 2010, 05:19 
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Joined: 27 Jun 2010, 15:21
Posts: 59
Location: Europe
GC build is continues,,
i have just few more questions..some are realy "noob-ish" :worried:
but i want to get it right,and not to destroy anything or wire at wrong way :angel:

Image

1)What does that S1 really means? some sort of switch or what?!

2)RIin will be replaced with volume meter..one for both channels..

3)OUTPUT will be speaker terminals..how do i connect + and -? what about Rl on the output?

Image

1)is this wiring correct?

2)SOURCE A and SOURCE B will be from the same two RCA jacks..

hope to help me..so that i can put together at least one channel today :mrgreen:

EDIT: some people use 10.000 or even 20.000uF caps..are mine 100uF caps totally wrong?a have some spare 20.000uF caps..should i try with some experimenting?


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PostPosted: 24 Jul 2010, 13:32 
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Joined: 28 May 2008, 21:53
Posts: 4580
Location: Winnipeg, CANADA
S1 is a switch. In this case it is optional and can be used to mute the amp.

The photo below shows the common pinout:
Attachment:
potentiometer-pinout-wiring-hookup.jpg


The 100uF + 0.1uF capacitors are physically located near the chip. In the power supply there is 10,000 - 20,000 uF of filtering. I followed the same LM3886 schematic for my [url=DIY LM3886 Chip Amplifier (Gainclone) Kit]DIY LM3886 Chip Amplifier (Gainclone) Kit build[/url] and you can see the large filter capacitors in the power supply portion.
Cheers


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PostPosted: 24 Jul 2010, 14:14 
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Joined: 27 Jun 2010, 15:21
Posts: 59
Location: Europe
so i did the right way and get rid of that S1..

so i see that i connected INPUT and GND wrong :blush:

today was "test drive"..no success......

i assume my RCA jacks weren't connected right at way and so were the speakers..and of course volume potentiometer!


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PostPosted: 24 Jul 2010, 16:33 
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Joined: 08 May 2009, 08:20
Posts: 918
Location: Duesseldorf, Germany
Hey hybrid,

you don't really need S1 (mute switch) anyway. Just connect the Rm from Pin8 to V- ( V minus).
You also can ommit Cm if you do so. The Rm is a nasty thing. You have to choose the right value here.
The value of Rm also depends on the supply voltage.
Mine is running at 2 x 42VDC and i had to use 4K7 for Rm to get the full volume (mute = 0).

Yep, check the RCA, potentiometer and speaker connections again.
The chips hate it, if they don't "see" the RCA and speaker grounds (Input or output ground).

Have fun :-).

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Cheers,
Tom.

Some of my projects: TDA2050 Chip Amp, the LM3886 Gainclone Thread and the Szekeres Headamp Thread.


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PostPosted: 25 Jul 2010, 03:28 
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Joined: 24 Jun 2010, 00:48
Posts: 788
Location: Christchurch, NZ
Hi Hybrid,

My net was down for a couple of days.
Good to see you have started building. Make sure you connect the heatsink to the chip even though you are testing for a short while.
I nearly burnt my chip up without that heatsink.

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Kind Regards,
Dinesh

Some of my diy audio projects:


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