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Zen Mod 20th October 2007 06:29 PM

Pumpkin preamp - ordered by Steen , official making thread
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well ...... seems ages ago ,buried in some obscure DiyA Pass thread , after few quickie (on back of napkin) modifications of XYWZwhatever BOSOZ , my budy Lucky Luke (AKA steen) , demanded one little preamp with balls ....

few posts later , LL have some ideas about topology, perfectly good for me , just because I'm good at paper (napkin) and hand calc almost as he is good in making amps ........

little later - I already have some quickie quickie drawn , but somewhat flipped in regard to LL's idea,with added output stage(s) etc.

main reason why I flipped it is because I feel ( well - I rarely think,anyway) that's smart to use some non-audio-fancy-schmanzy Jfet , which is easy to find in near tobacco store, with all other parts .....

well - result is here (lookie lookie schmtc)

crazy process of :Pumpkin: delivery is also crazy documented in THIS
thread .........

I can just say tnx to entire OFF TOPIC MOB , just because they make my life miserable with regular questions "will it drive F4 " etc . :devilr:

anyway ......... for first post is 'nuff

(next post -The Shunty)...........


With Choky's permission, I have created a new thread the is the same as this thread but with almost all Off Topic posts removed for easy reading by those making the project.

The new thread is closed and possibly won't be updated, so members should keep checking back here for latest info and amusement



lykkedk 20th October 2007 06:33 PM

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Hi all... The :Pumpkin: is amazing lookie lookie !


lykkedk 20th October 2007 06:40 PM

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:Pumpkin: setup in my livingroom... Swinging so easily 40v with 1,8 on input !!!

Thank's for all the help ZenMod... Maybee it will be a while before finishing it up...

I made a :Pumpkin: from scratch, designing my pcb (clumsy i know) myself... but the thing is playing really nice, not to mention very relaxing too. All diy'ers, which life depend's on the F4, really should consider the :Pumpkin: to drive it wild an mad...

ZenMod :devilr: :devilr: :devilr: nice weekend...


lykkedk 20th October 2007 06:42 PM

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O.T picture... of non shunty psu for my :Pumpkin:


lykkedk 20th October 2007 06:45 PM

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Last picture for tonight... ... Promish... :D


Zen Mod 20th October 2007 07:01 PM

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crazy danske was fast almost as his country man LL :clown:

lykkedk earned his right to post piccies of his own :Pumpkin: because he is first who actually made non-prototype version ..........

first official pair of main :Pumpkin: boards are happily arrived at first BAF in history....... we'll hear more about Smashing and Barking :Pumpkin: tomorrow......

well- steen ordered :Pumpkin:, but he didn't count on my everlasting love for shunt regs .
as result of that love there is The Shunty ........ simply - proper reg for any eeny weeny preamp ........

my friend Oly (AKA Vangelis on DiyA) is responsible for stunning pcbs for both :Pumpkin: and Shunty ; btw. "The Shunty" is his name for that simple reg . you'll see pcb piccies in later posts.

he is also responsible for keeping me in sane boundaries ; well - almost keeping me ;)

when I drew series reg, in front of already drawn and tested shunt part of now existing Shunty, his only (and last ) comment was "that's pure demonstration of force....... why you need that ?" :clown:

I also wanna say many tnx to Off Topic Mob , which constantly make my life miserable with repetitive questions as "will it drive F4?" etc .......... :devilr:

anyway - this was (is) open source project ......... my intention to make decent preamp for regular DiyA members, without braking leg and arm to find obscuremadeofpreputium audio parts (read - toshiba 3 or 7 legged fuses) ...

both schematics are here ; I intend to sell pcbs along with matched crucial parts , in several levels ........ just main boards with parts, just Shunty with few important parts (if they exist at all) , complete package, main boards with just one Shunty ( if you are bean counter) etc.

to cut a story..........

here is The Shunty schematic:

Zen Mod 20th October 2007 07:13 PM

main boards piccies

Zen Mod 20th October 2007 07:20 PM

The Shunty pcb piccies

Zen Mod 21st October 2007 12:30 AM

for all greedy boyz without missus's Iron to make own pcbs
The Pumpkin preamp package(s) for sale...............


steenoe 22nd October 2007 07:27 AM

Choky, thats just superb work. I cant wait to get started on that Pumpkin:cool:


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