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Chip Amps Amplifiers based on integrated circuits

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Old 3rd June 2003, 09:26 PM   #11
Nuuk is offline Nuuk  United Kingdom
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Quote:
"One secondary wire and one 0 wire are joined together and connected to the zero volt rail. The other secondary wire is connected to one bridge AC input and the other 0 wire is connected to the other bridge AC input."
Thanks Moamps, I got myself confused there! I'll make the changes to the site. Would it be OK to grab that circuit diagram - I'm getting rather bogged down doing all the graphics and I have a second GC to build for myself!

I'm including a contributor's list at the bottom of the FAQ page. If you would like to be included, let me know your real name.
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Old 3rd June 2003, 10:19 PM   #12
moamps is offline moamps  Croatia
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Quote:
Originally posted by Nuuk

Would it be OK to grab that circuit diagram - I'm getting rather bogged down doing all the graphics and I have a second GC to build for myself!

Hi,

"Just do it",
and.........PCB=printed circuit board


Regards
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Old 4th June 2003, 08:43 AM   #13
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good work, im also making a website about my gainclone, half for my own reference (always losing circuit diagrams) and half for others. it can be found at: http://www.freewebs.com/matttcatttweb
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Old 4th June 2003, 09:45 AM   #14
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Quote:
Originally posted by Nuuk

I have a second GC to build for myself!
Me too.
It's done, I only need the transformer.
It's been playing with my bech PSU.
This time it's with LM3886.
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Old 4th June 2003, 10:26 AM   #15
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Default samples

Matttcattt, the page is fine.
But if I were you I wouldn't make publicity to the fact you get your chips free from Texas Instruments.
I would take that sentence out of the page.
This applies to everyone.
We should not say to everyone we get samples.
One day they might stop the samples program.
Texas and others.
Let's keep it with us.
And we should not abbuse.
Ok?
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Old 4th June 2003, 10:57 AM   #16
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Default Samples

I've often thought about this.

A while back, I got an email from a Texas employee who'd seen my preamp project. I wrote back, explaining how I was slightly ashamed because I'd got my PGA2310's as samples (from Texas, of course). But his position was really good - they had no problem with supplying samples, especially when their products got such a good write-up (his words, not mine!)

I suppose when you think about it, the preamp project on my site is just a big advert for BB/TI

Cheers,

Mark
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Old 4th June 2003, 11:08 AM   #17
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Default just because they're free

Yes, but that's different.
Matttcattt says in his page:
"I chose to make this amplifier due to its simplicity (only 7 components per channel and a simple unregulated power supply) and price, as I got the amplifier chips free as samples from Texas Instruments."

And that's the problem.
One of the reasons is price, as he got the chips free from Texas.
It's not saying these are excellent chips.
It's saying they're free and that's why he has chosen them.
I thing this is not saying these Burr-Brown chips are the best or that they are very good.
Matttcattt, you could review this sentence.
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Old 4th June 2003, 11:44 AM   #18
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Default I agree

Carlosfm,

I do agree with you about the wording of MatttCattt's page - I was just providing an alternative viewpoint. I don't think they'll stop giving away samples just because a few of us are using them for hobby use, but you're right - we shouldn't abuse the system. I got some LM3875's as samples for my GainClone experiments - I fully intend to purchase some from Farnell for the final construction.

Cheers,

Mark
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Old 4th June 2003, 12:34 PM   #19
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Default Re: I agree

Quote:
Originally posted by mhennessy
Carlosfm,

I do agree with you about the wording of MatttCattt's page - I was just providing an alternative viewpoint. I don't think they'll stop giving away samples just because a few of us are using them for hobby use, but you're right - we shouldn't abuse the system. I got some LM3875's as samples for my GainClone experiments - I fully intend to purchase some from Farnell for the final construction.

Cheers,

Mark
You may read post #18 here:
Samples

Impressive, huh?
Some companies should get a nobel prize.
It's not that there are a few of us.
It's that some people call friends to help, and request hundreds of chips in one single day.
So I was giving an advice for everyone of us, the diyers.
Don't spread the word too much.
Matttcattt, you're a nice guy.
Would you change that sentence?
Plllllllleeeeeeeeeeeeeeeeease...
Oh, and I whant to see that car amp!
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Old 18th June 2003, 03:52 PM   #20
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I'm confused. I am looking at Daniels' GainKlone on Cattles' website http://www.freewebs.com/matttcatttweb/ and then looking at Nuuk's page. The circuits differ sligthly? On Cattles' page it has the Input capacitor and resistor pointed to pin 8 yet on Nuuk's page it is pointed to pin 7. Which is the right one?

Also what is so special about the separate star grounds? Can I just use a single star ground?
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