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Old 29th August 2011, 01:38 PM   #201
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Quote:
Originally Posted by padamiecki View Post
unbeliavle how important are inductors and 1.5 ohm resistors
I still can't get that trick to work... Would base resistors help?
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Old 29th August 2011, 01:39 PM   #202
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Quote:
Originally Posted by padamiecki View Post
as above,
cannot make this...
there is no txt extension in the name, but the file has txt in the properties...
in XP I was able to make it, but under Vista or W7 impossible... or I do not know how...
I will try to make this in win commander or similar,
thanks
PS Total commander has option to change the extension, I solved the problem, sorry for offtopic
You can edit you're folder properties to view the extensions of files (.txt;.avi;.asc;etc.)

Here (first google result): How do I show file extensions in Windows XP?

Similar method to do this in other windows versions. Now you can change extensions in windows explorer very easily.

Unrelated to above:

This thread may be slightly confusing to people who are new to it. They may think that the circlophone is one of the other couple schematics posted here, or may think it is unfinished or other. Or maybe I am wrong.

Last edited by odysseybmx414; 29th August 2011 at 01:44 PM.
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Old 29th August 2011, 01:44 PM   #203
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Quote:
Originally Posted by odysseybmx414 View Post
You can edit you're folder properties to view the extensions of files (.txt;.avi;.asc;etc.)

Here: How do I show file extensions in Windows XP?

Similar method to do this in other windows versions. Now you can change extensions in windows explorer very easily.
Thanks
as I wrote before I know how to do this in XP
but Vista or W7 are different.
anyway I did it in total commander and the problem is solved.
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Old 29th August 2011, 01:46 PM   #204
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Quote:
Originally Posted by padamiecki View Post
Thanks
as I wrote before I know how to do this in XP
but Vista or W7 are different.
anyway I did it in total commander and the problem is solved.
Sorry, read to quickly I guess.
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Old 29th August 2011, 03:03 PM   #205
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by odysseybmx414 View Post
Unrelated to above:

This thread may be slightly confusing to people who are new to it. They may think that the circlophone is one of the other couple schematics posted here, or may think it is unfinished or other. Or maybe I am wrong.
You are probably right: to a newcomer, it must look like a ragbag of unrelated things and subjects.

It would probably be a good idea to put some order into that, perhaps by creating an index or something of the sort, I'll try to think about it.
_________________________________________________

Anyway in the mean time, here is the message to the newbies:

The schematic in #1 is still current and up to date, PCB files can be found in #53, useful construction info in #56, pdf's of the pcb are in #59, a short explanation on how the servo works is here #106, #182 is a selection guide for different power versions.

Another PCB version is currently under development and should be released soon.


________________________________________________

Quote:
I still can't get that trick to work... Would base resistors help?
You mean you loaded my asc file and it doesn't work?
If that's the case, it can only be your LTspice settings are different than mine.
Mine are all defaults: normal solver, modified trap, etc.

Note that base resistors will make things worse for stability: the circuit will reverse them, making them negative.

Quote:
unbeliavle how important are inductors and 1.5 ohm resistors
You bet they're important: without them, the Xquad has an infinite gain at all frequencies, including infinity.
Not the straightest path to unconditional stability.
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Old 29th August 2011, 03:10 PM   #206
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Distortion is indeed down, not entirely sure I trust it yet...
This thing is on the hairy edge of unstable.
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Old 29th August 2011, 03:21 PM   #207
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by kenpeter View Post

This thing is on the hairy edge of unstable.
As you rely only on the bead's losses for damping, that's understandable.
And the beads do nothing to combat the negative resistance inherent to the circuit.
For stability, a degeneration resistor of minimum Rin/β is required. With ~470Ω, that's ~1Ω.
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Old 29th August 2011, 07:17 PM   #208
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oops! my bad, I picked one with only 0R7 DCR.
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Old 31st August 2011, 12:11 PM   #209
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Originally Posted by Elvee View Post
If you want to go even further in that direction (linearizing the LTP), another method is to use a crossquad.
The beast is difficult to tame, but it's worth the trouble:
THD @1W 1KHz can easily be pushed deep below the ppm threshold...
Hi Elvee
was it a trick to fool the simulator
or will work in practice?
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Old 31st August 2011, 01:52 PM   #210
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Substitute a slightly mismatched transistor across the quad,
and watch voltage offset at the output change many volts!
Granted, offset is multipled by 20, cause I neglected to add
DC blocking in the feedback loop. Probably not unmanagable.
On second though, that was idiotic of me. Any mismnatched
LTP will offset about the same, what was I thinking???

I was expecting offset to latch first one way, then the other.
But I could not get it to flip after it had taken a preference.
And the simulated distortion remained extremely low. I now
think this problem exists only in my imagination.

Last edited by kenpeter; 31st August 2011 at 02:03 PM.
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