High-End Regulated Buffered Inverted GC

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#261
cjd said:
er...

Your schematic has two C5's - as such, to clarify which caps should be as close to the regs as possible - those connected to pin3 (IN) of the regs I gather are two for sure - the other two that should be as close as possible would be across the output?

C
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My god, I made this in 5 minutes because I had plenty of work to do, but is it hard to understand?😱
C5 at the bottom is C6.
Sorry.
 
#262
Hi,

I might also add that the space between your ears might not be wide enough for you being able to comprehend what I'm showing here.
Click to expand...

Better to have those ears a little closer together than not having anything inbetween...

Cheers, :dead:
 

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#266
carlosfm said:


My god, I made this in 5 minutes because I had plenty of work to do, but is it hard to understand?😱
C5 at the bottom is C6.
Sorry.
Click to expand...

Heh. Nah, it's plenty good for me, now (wouldn't have been a month ago probably, but I wouldn't have tried building it then). But a schematic, you know, can find its way into all sorts of hands and not everyone may pick up on it or waits till they do understand. Probably will, but figured what the hey, I'll mention it. I've already got my answer btw (I'd put together a schematic from the scattered posts already and just popped back in this thread - mine wasn't quite right). no worries. Nothin to get worked up about, certainly.

I can just imagine some person trying to use the same cap on both sides... hope they use a fuse, and they're wearing safety glasses. 😉

C
 
#275
carlosfm said:
New holes, nice!
And then you put a knife on the PCB to take some masking out and solder some caps there.
Great!:clown:
So is the PCB that good?

Deam, why is it that this "star ground" looks to me as 1km long? :clown:
😀
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That's the mod recommended for "space" freaks like you. I compared that board to a minimum length ground and power connection, p2p circuit, and didn't observe any drawbacks (which was surprising, btw). If someone wants to add aditional bypass caps (which I never found necessary), or for that matter smaller electrolytics when using reg PS and have them really close to the chip, they can be soldered directly to IC pins and ground plane, on upper side. In that case, one point, star ground can be achieved (for those to whom it really matters).
 
#277
scope-free zone = blind zone for any seriously electronic designing
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I tend to agree with this view, after my 'fun' with the regulators and cap values I really wonder how many GC's out there are 'stable'. I know my layout is not the best, all P-P wiring, no PCB's 😉 however without a 'scope to hand I could not have known or sorted out the problems I had.....anybody want their amp tested? Free! Just for Fun! 😀

Carlos, not long to go now, may the best side win!! 😀 😀 :drink:
 
#278
Milan, thanks for the information on calculating the voltage through the 47 uF cap.

With my output voltage of 26.3 volts, that means approximately 25 volts should be going through the cap! So what's making it 'fizzle'?

I agree that making hi-fi without access to a scope is (sometimes)a big disadvantage and one reason that newbies rely so heavily on a well sorted design that they can copy!

But for people like me, the outlay on a scope is quite considerable, even buying one secondhand. I have been advised that the cheaper scopes do not really have a big enough range to be useful so am not even sure what to look for on Ebay.

Having said that, I have not done too badly using my ears, even if at times (like now) I have had trouble in pin-pointing a fault! 😉
 
#279
I had hoped we could turn the discussion back to the subject of regulated PSU's for the Gainclone.

It seems to me that there is a small misunderstanding between two parties here that is making a mountain out of a molehill.

Please guys lets cut the personal stuff and get on with the job of discussing the best way to impliment a regulated Gainclone power supply. 😉

Imagine somebody wanting to know about regulated PSU's, being pointed to this thread, and then having to wade through pages of personal warfare to pick out the odd post that is relevent! Perhaps in the interests of clarity, the mods could edit out the irrelelvent posts? :att'n:
 
#280
Nuuk said:
With my output voltage of 26.3 volts, that means approximately 25 volts should be going through the cap! So what's making it 'fizzle'?
Click to expand...
Hi,
Cut off this cap and measure voltage between adj pin and ground without any cap. Check once again correct caps orientation. Caps nominal voltage of 35V looks enough for your circuit, you are right, but obviously something is wrong.
I have been advised that the cheaper scopes do not really have a big enough range to be useful so am not even sure what to look for on Ebay.
Click to expand...
Scope with 20-30 MHz BW and dual input is just fine for the first time.

Regards
Milan
 
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