Enhanced Pultec - [silent:arts] version

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[silent:arts]
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Enhanced Pultec - [silent:arts] version

Beitrag von [silent:arts] »

as promised: my version of the Pultec PEQ1 (YET UNTESTED)

featuring 11 LF shelf drop freq. (20 - 2000Hz), 11 indipendend LF shelf boost freq. (20 - 2000Hz), 11 peak freq. (1K - 20K) and 11 shelf drop freq (3K - 28K).

my freq. calculation excell sheet is here

PCBs arrived today, so I stuffed what I have had at home (still have to order some parts):

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when everything is tested and working I will post the schematics and PCB layout.
volker
olafmatt hat geschrieben:Strom kann tot machen

matthias
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Beitrag von matthias »

well done volker! that looks very nice and clean...

I never saw these transformers before..??
and where did you got the pcb's from?

[silent:arts]
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Beitrag von [silent:arts] »

matthias hat geschrieben:well done volker! that looks very nice and clean...
thanks
matthias hat geschrieben:I never saw these transformers before..??
me two. they don't look like haufe or pikatron, but measured well and are 1+1:1. I found 12 of them in an old "geräteträger" i got for free ...[/quote]
matthias hat geschrieben:and where did you got the pcb's from?
I tried IBF - not the cheapest but the PCBs are ok.
volker
olafmatt hat geschrieben:Strom kann tot machen

Infernal_Death
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Beitrag von Infernal_Death »

Looks very cool, thanks for sharing.

Are those inductors self-wound ? I guess the amp section is based on Jakob's SRPP stage ?

Flo

[silent:arts]
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Beitrag von [silent:arts] »

Infernal_Death hat geschrieben:Are those inductors self-wound ? I guess the amp section is based on Jakob's SRPP stage ?
Yes, selfwound inductor (epcos RM8, N49 Core). and yes, the makeup stage is Jacobs SRPP stage.
I can post the schematics tonight.
volker
olafmatt hat geschrieben:Strom kann tot machen

[silent:arts]
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Beitrag von [silent:arts] »

volker
olafmatt hat geschrieben:Strom kann tot machen

nrgrecording
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Beitrag von nrgrecording »

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Hey, thats great! Verrry well done. Definately art ! Bild

[silent:arts]
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Beitrag von [silent:arts] »

thanks frank 8)
matthias hat geschrieben:I never saw these transformers before..??
btw, should be easy to convert the PCB to Lundahls - there is enough space left (first I wanted to do the layout for both, but then I thought w.t.f., get ready with your unit)
volker
olafmatt hat geschrieben:Strom kann tot machen

kubi
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Beitrag von kubi »

Cute, Volker <insert thumb-up-icon here>!

Looks like Pultecs are quite popular around here at the moment.
Darius

toff
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Beitrag von toff »

WOW!
Three thumbs up!

bernbrue
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Beitrag von bernbrue »

Hi Volker,
thats a very nice project. I really admire people like you being able to develop their own design, to built a costum made inductor and finally etch their own pcbs. I always ask myself: what do they know, I don´t know; what abilities do they have, I don´t have (sigh). Well, I still solder standard parts on premade pcbs, but half year ago I even didn´t think of the possibilty to built my own SSL or 1176. I´m still learning and DIY is so interesting. Keep on going with these fantastic projects so that people like me can learn from. ATM I´m working on G-Pultecs (maybe a stereo version). I stick to the standard frequencies. So, congratulations and thumbs up.
regards
Bernd

P.S: Do you plan to make the pcbs and inductors available for less experienced DIYers like me?

[silent:arts]
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Beitrag von [silent:arts] »

bernbrue hat geschrieben:Do you plan to make the pcbs and inductors available for less experienced DIYers like me?
Hi Bernd,
first I have to finish the unit and see if it works :D
don't know when this will happen since I have a leck of time and money at the moment :(
doing this inductor is not hard if you can count up to 410 :)
oh, and since those unknown transformers I used are not available the PCB should be changed to Lundahls or something else.
if you are interested in a PCB set I can change the layout to other transformers and send you the files.
volker
olafmatt hat geschrieben:Strom kann tot machen

bernbrue
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Beitrag von bernbrue »

Hi Volker,
yes, the layout with easy available Transformers (Lundahl or OEP) would be nice, although I´m not able to etch the PCBs myself. You said, that you had your pcbs made by a company. How much would I have to pay for a few pcbs? Are their any pcbs services with reasonable prices available?
Thanks a lot
Bernd

laitue5
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Beitrag von laitue5 »

:thumbleft:
Great one.
And thank you for your invitation in this forum.

[silent:arts]
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Beitrag von [silent:arts] »

You are welcome.
No update for this project yet (I'm just finishing the APIs you send me) ...
have fun :D
volker
olafmatt hat geschrieben:Strom kann tot machen

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