Thanks a lot, Jurgen🙂
The Twisted guys stuff simply works great! The attanuation curve is just superb... And no switching noise to be heard at all. Nice, indeed..
🙂
The Twisted guys stuff simply works great! The attanuation curve is just superb... And no switching noise to be heard at all. Nice, indeed..
🙂
Still talking about gain & feedback -
I guess the value of R6/R3 determines the amount of negative feedback to determine the gain.
Other than voltage swing / gain - if there any other effect of changing the feedback/gain on the audio signal? Bandwidth wise or distortion wise.
I've read previously that more negative feedback (lower gain) will reduce distortion but will also limit the bandwidth. I assume that with the value of gain chosen for pumpie 4.7-15, there shouldn't be an issue with bandwidth?
her shann
I guess the value of R6/R3 determines the amount of negative feedback to determine the gain.
Other than voltage swing / gain - if there any other effect of changing the feedback/gain on the audio signal? Bandwidth wise or distortion wise.
I've read previously that more negative feedback (lower gain) will reduce distortion but will also limit the bandwidth. I assume that with the value of gain chosen for pumpie 4.7-15, there shouldn't be an issue with bandwidth?
her shann
Manu said:
Take a close look at ZM's picture. The -IN is simply shorted to ground at the header, (connecting the particular input) through a small piece of tinned CU wire, so when the relay of that particular input is selected, it will automatically short -IN to GND. Pretty bright idea, or what...
Zen Mod said:
The twisted X-driver, as they call it, actually does perform wonders. I like it a lot, indeed. If its for sentimental reasons I dont know, but I find the Pumpkin more musical and a tad less "clinical" to listen to. Noisewise the Twisted X driver is the winner. I never experienced anything like it. With the volume at full throttle (no signal ofcourse) there isn't even the least bit of hiss😱 The Pumpkin is absolutelly good in that respect also, but there is a slight trace of hiss at full output. Not that it matters for all practical purposes at all. That slight hiss, can never be heard with a signal on😀
Having been listening to the Pumpkin for a while now, I must confess that it is my preamp of choice! It simply does have it all: Sweet silky topend details, very nice and warm midrange (voices) and a very firm bottomend! Now thats all pretty much heard before, but the Pumpkin has the very important "Foot-tapping"-effect like a X-BosoZ😱 I never thought that I would find that combination in one preamp! But here it is. I find it hard to keep my feet still, when using the Pumpkin😎
Thanks a lot, Choky😉
🙂
hershann said:
yup , but not exactly ;
ratio of both sides R5/R1 AND R6/R3 is determining gain
hershann said:
nope
hershann said:
it will reduce distortion, but broaden bandwidth ; contrary to what you read
hershann said:
it will be bandwidth changes , but your ears certainly will not hear difference ......
Steen, Thanks, but I have to think a little bit about...
(You mean that said input is then always RCA?, definitively non-XLR, nevermore...)
What you says about Pumpkin is absolutely what I expect from this Serb-Jewel.
Peanuts butter and cevapi.
I can't wait to finish mine...
🙂
(You mean that said input is then always RCA?, definitively non-XLR, nevermore...)
What you says about Pumpkin is absolutely what I expect from this Serb-Jewel.
Peanuts butter and cevapi.
I can't wait to finish mine...
🙂
steenoe said:
there is no need to thank me ........ and to make me blush ( even if that is pretty impossible
) ;I was interested in exact difference (sound etc. ) between these two sides of same coin...... hehe - even if mine is pretty gray comparing it to certain complexity of chips ......
...... thinking about difference in efforts to make one or another and final results ....in any case - if these chippy dreks are made by Papa's pattie pattie , they can't be bad ..... so easily
btw - I can't find exact schmtc of twisted X without too much trouble ..... (seems that today search func and me aren't in good relation 😕 )
have you linkie to exact post ............
hehe - I can bother ya - seems that your shoulder is certainly better - more than one post in a week 😉
EDIT
I found it .......... 4 eyed ZM ...... 😉
http://www.diyaudio.com/forums/showthread.php?postid=921115#post921115
Manu said:
steen was just too lazy to put all XLRs and RCAs on every input , and make some nice U shorties ...... for 1&3 marked holes
Chocky says :
- was interested in exact difference (sound etc. )
- .. I find the Pumpkin more musical and a tad less "clinical" to listen to. ... I must confess that it is my preamp of choice! It simply does have it all: Sweet silky topend details, very nice and warm midrange (voices) and a very firm bottomend!
Now thats all pretty much heard before, but the Pumpkin has the very important "Foot-tapping"-effect like a X-BosoZ I never thought that I would find that combination in one preamp! But here it is. I find it hard to keep my feet still, when using the Pumpkin ... Steen says
Nice review nicht wahr?
Manu
Quoting is creavivity
- was interested in exact difference (sound etc. )
- .. I find the Pumpkin more musical and a tad less "clinical" to listen to. ... I must confess that it is my preamp of choice! It simply does have it all: Sweet silky topend details, very nice and warm midrange (voices) and a very firm bottomend!
Now thats all pretty much heard before, but the Pumpkin has the very important "Foot-tapping"-effect like a X-BosoZ I never thought that I would find that combination in one preamp! But here it is. I find it hard to keep my feet still, when using the Pumpkin ... Steen says
Nice review nicht wahr?
Manu
Quoting is creavivity
Zen Mod said:
there is no need to thank me ........ and to make me blush ( even if that is pretty impossible
I was interested in exact difference (sound etc. ) between these two sides of same coin...... hehe - even if mine is pretty gray comparing it to certain complexity of chips ......
in any case - if these chippy dreks are made by Papa's pattie pattie , they can't be bad ..... so easily
btw - I can't find exact schmtc of twisted X without too much trouble ..... (seems that today search func and me aren't in good relation 😕 )
have you linkie to exact post ............
hehe - I can bother ya - seems that your shoulder is certainly better - more than one post in a week 😉
Yep, shoulder is pretty good, so I am posting again using too much time on PC, so shoulder is gonna be bad again
There is all reason to thank you!! You have been giving more to the DIYaudio community than anyone else (except Mr P. ofcourse) Babbelfish & Pumpkin, together with a never ending will to help out!! DIYaudio would be a poor place, without you😎
Here is the TXD manual made by the two great pears:
http://www.twistedpearaudio.com/docs/txd/txd-doc.pdf
For a chip, I can assure that it sounds just great! I was pretty surprised to find out!
Oh, and here is a piccy of the mess, look at them small TXD boards:
🙂
steenoe said:
Yep, shoulder is pretty good, so I am posting again using too much time on PC, so shoulder is gonna be bad again
Oh, and here is a piccy of the mess, look at them small TXD boards:
🙂
after that post of yours , only I can is to crawl under greatest rock I can find , for at least few dayzzzzzzzzzzzzzzzzz 🙄
just one thing before that (crawling ) - what's easiest way to find few these chipsies for playin' purposes ........ ?
(I'll not mention how that thingie will work even with plain simple shunt reg ........
)
Manu said:
Its not even difficult, when you look at it the right way🙂 Imagine this scenario: You have balanced inputs and single ended inputs! 2 inputs are reserved for balanced signals so they are left untouched!! Input #1and#2 are reserved for that! Now #3 to #6 are supposed to be single ended inputs (SE) So those will need to have the -IN grounded! Follow me so far?? Well, in case of the Darwin running balanced, there is 3 connections for each channel: + - and GND. What I did was to connect (short) the -IN of input 3-6 to GND right at the Darwins input selection!! You could do the excact same thing with a normal input selector with 4 decks....
Steen.
Zen Mod said:
after that post of yours , only I can is to crawl under greatest rock I can find , for at least few dayzzzzzzzzzzzzzzzzz 🙄
just one thing before that (crawling ) - what's easiest way to find few these chipsies for playin' purposes ........ ?
(I'll not mention how that thingie will work even with plain simple shunt reg ........
No reason to hide under rock...😀 I am sure a lot of folks around here says the same😉
There is no easy way of finding those chips, I guess... National Semi more ore less shut down on samples! (Chipamp anyone??)
I have some that I bought from Digikey. I would be more than happy to send you a few of them🙂 Wont cost you a dime😉 They are sort of SMD, so be warned😀
🙂
ZM - from under the rock
you must tick "quote" field and try later to not delete these bracketed parts :
[ QUOTE ] [ i ] Originally posted by Manu [ / i ] [ B ] in front , and
[ / B ] [ / QUOTE ] on end of post you are quoting
being a professor is somewhat ......... something 😉
I know that - my better half was/is professor , beside other things
Manu said:
you must tick "quote" field and try later to not delete these bracketed parts :
[ QUOTE ] [ i ] Originally posted by Manu [ / i ] [ B ] in front , and
[ / B ] [ / QUOTE ] on end of post you are quoting
being a professor is somewhat ......... something 😉
I know that - my better half was/is professor , beside other things
steenoe said:
that will be more than welcome - as soon you receive substitution for magically vanished pcb from Rovsing's drawer ........
just curious - how much they costed at digikey?
are they still available ?
Re: ZM - from under the rock
Manu is a professor🙂 If you (Manu) have trouble with something, send it to me and I will fix it😀 I am not a professor, I am just plain stubborn😀
Zen Mod said:
you must tick "quote" field and try later to not delete these bracketed parts :
[ QUOTE ] [ i ] Originally posted by Manu [ / i ] [ B ] in front , and
[ / B ] [ / QUOTE ] on end of post you are quoting
being a professor is somewhat ......... something 😉
I know that - my better half was/is professor , beside other things
Manu is a professor🙂 If you (Manu) have trouble with something, send it to me and I will fix it😀 I am not a professor, I am just plain stubborn😀
Zen Mod said:
that will be more than welcome - as soon you receive substitution for magically vanished pcb from Rovsing's drawer ........
just curious - how much they costed at digikey?
are they still available ?
He-he, Rovsing never found out what happened😀 😀 The poor chap is way too slow😀 😀 Besides that, he fart too much.
They cost in the neighbourhood of 4-5 USD as far as I recall... I will check it out.
🙂
Here ya' go:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=2556125;keywords=ths4131
Prices without VAT and whatever....Usually adds up to a sigificant amount.......
🙂
http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=2556125;keywords=ths4131
Prices without VAT and whatever....Usually adds up to a sigificant amount.......
🙂