Pumpkin preamp - ordered by Steen , official making thread

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luvdunhill

luvdunhill

Member
Joined 2006
so, I'm thinking about attenuators, and was thinking.... why not see what Papa's cooked up:

http://www.diyaudio.com/forums/showthread.php?postid=1521766#post1521766

First, what does he mean about last "manual" version?

Second, I basically will have an all Papa system.. DIY Ono for stereo table, DIY Pearl for mono table, F4, and now Pumpkin (and one of those Shiga-thingys for the occasional CD).. any recommendations on how to configure this LDR thing impedance wise?

Lastly, I suppose I'd need some sort of 4 channel version, as dual pots that are not stepped doesn't excite me... so, any ideas on how to do this?

Thoughts?
 
Zen Mod

Zen Mod

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Joined 2003
zenmod.in.rs/
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luvdunhill said:
so, I'm thinking about attenuators, and was thinking.... why not see what Papa's cooked up:

http://www.diyaudio.com/forums/showthread.php?postid=1521766#post1521766

First, what does he mean about last "manual" version?

Second, I basically will have an all Papa system.. DIY Ono for stereo table, DIY Pearl for mono table, F4, and now Pumpkin (and one of those Shiga-thingys for the occasional CD).. any recommendations on how to configure this LDR thing impedance wise?

Lastly, I suppose I'd need some sort of 4 channel version, as dual pots that are not stepped doesn't excite me... so, any ideas on how to do this?

Thoughts?
Click to expand...

easy to do - you must have them enough to make quad pot ;)

make it as Papa drew ,I suppose that's good enough :rofl:

(last manual version , probably not driven with some uProc .? )
 
jacco vermeulen

jacco vermeulen

Member
Joined 2004
Sigh.

Mr P's 2-channel light orchestra has the 4 LEDs of the LDRs in series.
A single pot for 2 channels means perfect symmetric attenuation, to use the same deal for 4 channels (aka balanced stereo) would imply putting 8 LEDs of 8 LDRs in series.

(Coco Chanel No5 perv-hume is what the ladies want, Eau-Balance stereo aka Chanel No4 for gents)
 
Zen Mod

Zen Mod

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Joined 2003
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jacco vermeulen said:
Sigh.

Mr P's 2-channel light orchestra has the 4 LEDs of the LDRs in series.
A single pot for 2 channels means perfect symmetric attenuation, to use the same deal for 4 channels (aka balanced stereo) would imply putting 8 LEDs of 8 LDRs in series.

(Coco Chanel No5 perv-hume is what the ladies want, Eau-Balance stereo aka Chanel No4 for gents)
Click to expand...


first pasus - clear and fine ;

but that last part - odour related , was puzzling
 
luvdunhill

luvdunhill

Member
Joined 2006
hmm... microcontroller sounds too complicated. If using 8 LDRs in series, where are the taps for the other channel? Would you not need to build in some sort of attenuation range adjustment for the extra 4 LDRs?

I'm keen on trying it out, assuming the matching doesn't get as insane as what people in that other thread are doing for 6-channel attenuation... now all I need is a plan ;)
 
luvdunhill

luvdunhill

Member
Joined 2006
jacco vermeulen said:
Yeah, the decent optocouplers seem expensive, and if you want 8 matched ones you may have to buy 30.
Easiest adress for a Siliconix NSL low-R type is like $3.50/100.
Smells like groupy gang bang, no ?
Click to expand...

Papa makes a part recommendation in the above thread, as well as gives distribution data... but your estimation seems reasonable enough to me.

I have no problem working a group buy. It seems that Allied is a good place to get these critters from.
 
jacco vermeulen

jacco vermeulen

Member
Joined 2004
As usual, prettiest would be to measure all of them to get matching colors, but at the price of a letter and stamp we could undertake a global logistics operation later on.

Peut-etre parce que c'est une ligne Pro de SMEG, Grand-Marechal de Sausisse.
Pour le 2eme-Q :je suis Jaccolina de la Cucina depuis ma 10eme, je "connais"quelques gents d'etoile-ttes. Il-y-a aussi une ligne gourmande sur diyA, autres images de ma cuisine sont la ba-ba)
~50% de mes livres bouffe-ttes=>
 

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Zen Mod

Zen Mod

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zenmod.in.rs/
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jacco vermeulen said:
As usual, prettiest would be to measure all of them to get matching colors, but at the price of a letter and stamp we could undertake a global logistics operation later on.

Peut-etre parce que c'est une ligne Pro de SMEG, Grand-Marechal de Sausisse.
Pour le 2eme-Q :je suis Jaccolina de la Cucina depuis ma 10eme, je "connais"quelques gents d'etoile-ttes. Il-y-a aussi une ligne gourmande sur diyA, autres images de ma cuisine sont la ba-ba)
~50% de mes livres bouffe-ttes=>
Click to expand...


Jaccovitty and Manuovitty ;

pricajte srpski da vas ceo svet razume ........ dosta vise tih lokalnih jezika !

:rofl:
 
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