To make a 1/2 circuit, you just print the schematic on piece of paper and vertically fold the paper across the 268 ohm resistor. Each side is now completely independent and can be driven by a current through the 10 ohm resistors.
I prefer NOT to use global negative feedback, however you can use as much as you want, at your own risk. 
Well, concerning quality of audio circuits, there are two major criteria:syn08 said:
1. How the device sounds to the human listener;
2. How the device is measured.
Since we cannot compare actual listening here on the forum, all we can compare how different device measure.
Concerning measurable aspects, noise is one aspect, along with few others.
Anyhow, I challenged all to come up with a better design than the one I posted above, a design referred to John Curl.
So far I haven’t seen any suggested design, only verbal debates without any actual example.
So, do you have any design for us to look at and may be learn from?
syn08 said:
It is important to me, since I know, out of my own experience, that it sounds worse than no GNFB circuits.
lineup said:
Sorry, checking all 4000 posts of yours is way too much for me.
If you have a point to make, please support it by a schematic posted along your post.
lineup said:
Thank you, email received and file downloaded.
Joshua_G said:
As long as you are unable to specify:
a) the scope of the design
b) the performance metrics and
c) you are imposing your own subjective criteria ("out of my own experience, that it sounds worse than no GNFB circuits")
then chances for somebody to come up with what you would call "a better design" are nil.
Examples:
- if the scope of the design is a line amp for 100mV input level then the noise performance is absolutely irrelevant in any competent design, using modern components. See e.g. Pavel's Dispre design.
- if the scope of the design is a phono stage, then noise performance is critical but anything unde 0.05% distortion is very good. See e.g. my HPS 2.0 amp (BTW, it happens to have 0.002% distortion).
- if the scope of the project is a mediocre design that would be to noisy as a MM phono stage and have to much distortion as a line amp, then you build JC's schematic you just posted and happily live ever after.
Joshua_G said:
You must realise that IC means Interconnect. PC means powercord.
There's no need to. Re-read what I have written with InterConnect in mind. If you were thinking integrated circuit, then you have no idea what the textual meaning was..Joshua_G said:
After re-reading, explain to us why what happens "outside the box stays outside the box"...why we really don't have to worry about multiple ground paths destroying the shielding.
If you have any design layouts you are willing to share with us, I'd be glad to have a look-see at it, give you my take on it's good (or lousy) design.
Remember...
1. inductance is the enemy..
2. a single wire does not have inductance.
Cheers, John
PS..if anybody has a layout they'd like to show, that'd be nice. Not that bowl of spaghetti, but something more reasonable..where we could evaluate the current paths.
"You must realise that IC means Interconnect. PC means powercord."
You are in the educational corner today?
🙂 🙂
Stinius 🙂
You are in the educational corner today?
🙂 🙂
Stinius 🙂
syn08 said:
Few links, none relates to specific design schematics.
If you have a schematic you want us to look at, please post it here.
stinius said:
Yah, give or take.😀 😀
I hadn't suspected the use of "IC" would be misconstrued as integrated circuit..
Ya know, ya sit and talk a mile a minute about IC, PC, EMI, NEC, EMC, whatever, and ya just get yoosed to the nomenclature..not thinking about whether or not the other understands...
I shoulda known better..plus, he is on da udder side of da pond...
Cheers, John
Joshua_G said:
C'mon Josh, can't you find the schematics in those threads?
Wait, they might be to large? Really, I don't mind your JC adulation and I'm sure JC doesn't either.
- Status
- Not open for further replies.