Fodera, Sadowsky, aguilar, and other bass preamps

Stompboxes circuits published in magazines, books or on DIY electronics websites.

Re: Fodera, Sadowsky, aguilar, and other preamps

Postby Brink » 27 Aug 2009, 19:34

Someone has come forward and offered to trace the Sadowsky preamp/DI. I just mailed the pedal off a few minutes ago.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby Silent Fly » 27 Aug 2009, 20:04

Brink wrote:Someone has come forward and offered to trace the Sadowsky preamp/DI. I just mailed the pedal off a few minutes ago.


Excellent! Thanks :thumbsup
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby quaternotetriplet » 06 Sep 2009, 09:06

Nice.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby chicago_mike » 09 Oct 2009, 01:11

I would love a pcb layout gif to make one of these. :D
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby chicago_mike » 25 Oct 2009, 19:31

how would I take the green out to make this apcb printable file?

I am thinking of making my own class d bass amp and using something like this as the pre.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby lietuvis » 26 Oct 2009, 19:25

chicago_mike wrote:how would I take the green out to make this apcb printable file?

I am thinking of making my own class d bass amp and using something like this as the pre.


Hi if you are talking about this one I've posted as a ampeg and swr hibrid bass preamp there is diptrace pcb file.if you have any questions pm me or email me litvanas at googlemail.com
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby chicago_mike » 26 Oct 2009, 20:23

:hug:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby quaternotetriplet » 29 Oct 2009, 08:33

:shock:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby chicago_mike » 29 Oct 2009, 08:52

yes were all tree huggin lovie dovie hippies here... :P
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby quaternotetriplet » 29 Oct 2009, 11:22

:hug: yeah can i join. LOL :applause:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby chicago_mike » 29 Oct 2009, 11:33

sure....

umm.... how do I turn youre schematic/layout into a printable layout? I tried the program but eaglecad even gets me, so .... :oops:

IM super interested in building this. :)
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby lietuvis » 29 Oct 2009, 15:16

chicago_mike wrote:sure....

umm.... how do I turn youre schematic/layout into a printable layout? I tried the program but eaglecad even gets me, so .... :oops:

IM super interested in building this. :)



well you have to use diptrace software which is free to use to certain level and can be downloaded from here http://www.diptrace.com/.when it comes to printing you have to tick boxes or untick what layers you want to print for example silk screen is off then only traces will be printed.hapy building and dont forget to tell the results.it's based on Ampeg B2R +SVT-6 PRO EQ section and I took SWR workingmans 15 very front end with aural enchancer instead B2R ultramid.it easy can be modified to have efx send return option or built as only semiparametric EQ with Ampegs or SWR parameters by changing resistor+cap+pot values.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby chicago_mike » 29 Oct 2009, 15:54

I saw the export option, but didnt see any format I could really use, well photoshop did recognize one thankfully. :)
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby chicago_mike » 29 Oct 2009, 16:01

Nevermind...just made a pdf... :roll:

played around with diptrace..its interesting, but I already goof with eagle and my brain doesnt need more confusion. :cry:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby gena_p1 » 10 Feb 2010, 14:59

Brink wrote:...
I've got a Sadowsky Bass Preamp/DI sitting around, in a unmodded and nonworking condition. The board is SMD and ungooped. Tracing this is beyond my abilities, but if someone else wants to do it I'll mail it to them.
...


Values are unreadable, so here is nothing to trace (and compare to cube 60 bass)
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby lietuvis » 23 Sep 2010, 20:46

Hi, got chance to trace Fender Precision Deluxe Lyte MIJ onboard preamp.files are in DIPTRACE software format.the PCB is doublesided :( but schematic is pretty simple so it can be done on single layer board.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby Silent Fly » 23 Sep 2010, 21:14

lietuvis wrote:Hi, got chance to trace Fender Precision Deluxe Lyte MIJ onboard preamp.files are in DIPTRACE software format.the PCB is doublesided :( but schematic is pretty simple so it can be done on single layer board.


Thanks!
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby quaternotetriplet » 26 Sep 2010, 04:04

that was nice preamp..
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby lietuvis » 30 Sep 2010, 00:37

Here is another interesting bass preamp (has minor errors) with variable low pass filter and switchable Q found on other forum.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby jay42 » 11 Jan 2011, 01:15

I don't have permission to share the Sadowsky preamp schematic, however, I can describe it to the point that you can develop your own. First off, it's a Blackface preamp done with JFets. The tone stack is scaled appropriately...which is to say, the 100K slope resistor becomes a 10K slope resistor and the capacitors go up by a factor of 10. For a built-in, you've got a 500K audio pot for volume up front instead of after the tonestack. 2x 2N5457 You could add a mid-range pot in lieu of the fixed resistor, which is 750 ohms instead the 960 you would expect. I've been told that the Aguilar two-knob built-in is the same circuit, but I can't confirm it.

I sort of think it's ironic that some bassists will say, "I'm all modern here with active electonics and all. I need a flat pre-amp." They're really just playing through a Fender.

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