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Old 29th May 2014, 05:15 PM   #1
Pjotter is offline Pjotter  Netherlands
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Lightbulb ChipAmp in CNC milled billet aluminum chassis? Yeah!

ChipAmp in CNC milled billet aluminum chassis? Yeah!

Hello all,

I'm Peter, 25 years old, living with my girlfriend in the Netherlands, working as a CNC machinist (3 and 4 axis machines, programming done by me and my colleagues using cad/cam. I've been programming old school style before for a few years), extremely interested in everything that's technical and i'm an extreme perfectionist in everything that i make or do.

About ten years ago I've build a Gainclone, his project was done with my brother (who's also a member of this forum).
I've been using it on and off since then. The main reason for not using it a lot is because it's not really user friendly.

It had only one channel, a simple (cracking and cheap) pot for volume control and no on and off switch.

You might say that this is the Gainclone in it's purest form, which it is. But i'm more demanding, i don't want to walk up to my amp all the time to change volume, pull the plugs and insert others to change the input.

So i decided to take it all apart and give it a make over
But i'd like to do this project publicly so others can benefit.

Most of things i can do myself, but i must say that i practically have no experience or knowledge about electronics. The things i do is basically common sense for me.
But i could really use some help every now and then

If anyone has any comments or questions, please comment or ask!

Thanks in advance for any replies!

Regards,

Peter

P.s. i hope my English is o.k. I've done my best to type as understandable as possible

Last edited by Pjotter; 16th July 2014 at 07:17 PM.
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Old 29th May 2014, 05:19 PM   #2
Mooly is online now Mooly  United Kingdom
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Welcome to diyAudio Peter

That sounds quite an ambitious project... I'd perhaps suggest breaking it down and posting the relevant questions to the appropriate forums. You'll get the best and most responses that way.
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Old 29th May 2014, 05:26 PM   #3
Pjotter is offline Pjotter  Netherlands
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Hi Mooly,

That's a quick reply!
I see you're a moderator, any idea why i can't post pic's?

Thanks.

- peter
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Old 29th May 2014, 06:13 PM   #4
Mooly is online now Mooly  United Kingdom
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You should be able to post OK. This is the standard procedure,

To add a photo, files or non standard files.

First click "go advanced" in the box below the "quick reply" message box. Doesn't matter if you decide half way through a message to do that, it carries it forward.

Then click "Manage attachements". Maximise the new Window so that you can see all the text.

Click browse in the first box at the top and find your picture. Repeat for any more pictures.
Click upload... a message appears "uploading"
When complete the files will show as being attached. Now click the small text that says "close this window"

The pictures should now be attached and when you submit your post they will appear.

Make sure your pics aren't too big, a couple of 100k is plenty, and many members object when they are massive and it alters the margins
It tells you in the attachments window what max sizes are allowed.


If you want to attach a file that has a non standard format for example excel, circuit simulation etc then try putting the files in a zipped folder and attaching that.
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Old 7th July 2014, 07:08 PM   #5
Pjotter is offline Pjotter  Netherlands
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Smile First update

I haven't really posted anything since I've started this thread,

But i think it's time to start posting some things here

I've included a basic idea of what i'd like to make
The amplifier will be milled out of solid aluminum and anodized.
I'm not sure whether it's going to be black or clear, I really like both.

I'll fit front and back panels into the case, they'll be made of polished stainless.
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Old 7th July 2014, 07:11 PM   #6
Pjotter is offline Pjotter  Netherlands
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Also,

The state of my amplifier at this moment :
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Old 7th July 2014, 07:26 PM   #7
Pjotter is offline Pjotter  Netherlands
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I started to tweak this amplifier which was initially build about ten years ago.

It was just very very basic, two LM3875 IC's and a 20K pot.

No capacitors after the bridge rectifier, no filters, no zobel network, no snubbers, no star-ground, no remote, no channels to choose from nothing, no bass ...

The pictures included in this post will show what the amp was a few months ago

Of course there used to be an aluminum cover on it.
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Old 7th July 2014, 07:28 PM   #8
Pjotter is offline Pjotter  Netherlands
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The main reason for me to change this amplifier was basically because the old pot was cracking pretty loud.

At first i just wanted to replace the pot.

But... It might be familiar for some, there's no end to a project..
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Old 7th July 2014, 07:33 PM   #9
Pjotter is offline Pjotter  Netherlands
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This was basically the first step i took:

get the pre-amp board instead of the volume pot.

But it was still buzzing pretty badly, lots of noise and ground issues.
And of course a pretty bad hum caused by the fact that there was no filter after the bridge rectifiers.
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Old 7th July 2014, 07:38 PM   #10
Pjotter is offline Pjotter  Netherlands
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I decided i wanted to try the LM3886 over the LM3875.

Only to find out that it didn't fit on my old heatsink.

Therefore, i had to make one.

Why buy it if you can make it?
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