Fodera, Sadowsky, aguilar, and other bass preamps

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

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

Postby darmstat » 09 May 2013, 05:05

Does anyone have a schematic for the Demeter BEQP ?
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby darmstat » 18 Aug 2013, 20:34

Rcustoms....it looks like the 3 band bass EQ of the Seymour Duncan bass preamp. Bass (boost)90hz, mid cut 575hz, bass 32hz, mid 650hz, and treble 5khz. Using a bandpass EQ filter.
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby rcustoms » 18 Aug 2013, 21:33

darmstat wrote:Rcustoms....it looks like the 3 band bass EQ of the Seymour Duncan bass preamp. Bass (boost)90hz, mid cut 575hz, bass 32hz, mid 650hz, and treble 5khz. Using a bandpass EQ filter.

maybe i found many circuit based on.like jackson electronics guitar eq booster copied for esp and other brands
http://www.rcustomspedals.blogspot.com
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby darmstat » 19 Aug 2013, 03:13

Rcustoms...I have this for a schematic so far. It is rough so be gentle....lol

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

Postby rcustoms » 19 Aug 2013, 04:47

darmstat wrote:Rcustoms...I have this for a schematic so far. It is rough so be gentle....lol

looks so good,good work ,is the definitive schematic or rev 1
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby rcustoms » 19 Aug 2013, 04:54

rcustoms wrote:
darmstat wrote:Rcustoms...I have this for a schematic so far. It is rough so be gentle....lol

looks so good,good work ,is the definitive schematic or rev 1

the last model of fender basses(i don't remember which one) use this little demon,recently i install one, on an ibanez sound gr and is amazing what he does with a cheap pickups.
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby lars-musik » 01 Dec 2013, 11:06

Just in case someone's still interested: Here's a pcb I did for the Silent Fly’s Sadowsky Preamp schematic on the third page of this thread. I liked the sound a lot better with J201 transistors, drain voltages adjusted to about 4.4 V each. Replace R4 and R7 with trimmers to adjust the voltage.
Cheers, Lars
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby Duckman » 03 Dec 2013, 01:10

darmstat wrote:Rcustoms...I have this for a schematic so far. It is rough so be gentle....lol

The 1M resistor at the input... goes to ground or to Vr?

Edit: I mean, in the Curbow schemo
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby flood » 08 Dec 2013, 18:46

looks awesome baja, I might just give this a spin. wondering if I should try my buffer-before-blend concept with this design... it worked fantabulously with the Music man design.
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby lietuvis » 14 Mar 2014, 18:48

Hi all, I came across the Yamaha BB604-605 bass service manual with schematic.The preamp has built in NE-1 parametric EQ for midrange control. Original PCB is double sided so I redesigned to single side PCB. I have not built it yet but have plan to do. On my PCB I designed the way that IC's are mounted on track side :oops: , but if legs are bent backwards it will fit as normal. If there are interest to make this preamp feel free to use or modify these files. The PCB is drawn on Sprint Layout 6.
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby i2k » 20 Mar 2014, 01:01

EWS Trilogic here : viewtopic.php?f=7&t=16263&p=232387&hilit=tri+logic#p232387

But no conclusion at the end. Perhaps they need Mr Bajaman magic touch ?
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby darmstat » 07 Jun 2014, 20:02

Curbow Eq

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Fender Deluxe Bass Preamp

Postby deltafred » 17 Mar 2015, 23:12

Not my work, all credit goes to khutch on Talkbass.

See http://www.talkbass.com/threads/fender- ... es.934190/

Image

Image

Image

Image

(Apologies for the huge pictures.)
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby gogata » 15 Jun 2015, 13:59

bajaman wrote:okay - here are some graphs :wink:
the first is normalized to all controls flat (mid way)
then: full bass boost, full bass cut, full mid boost, full mid cut, full treble boost, and finally full treble cut.
enjoy :D
bajaman



Hi, i don't know how to read these grafs on page 5. I'm curious what is center frequencies of these preamp.
Thanks for help!

Are C13 electrolitic or no ?
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby EddieTavares » 17 Jun 2015, 15:21

Guys

What about using charge pump to increase the available voltage adding more headroom? Does it short the battery life?
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby lietuvis » 28 Dec 2015, 19:44

Hi here I traced Bartolini MK I onboard preamp using pictures from web , maybe some one do have one and can measure or already know smd capacitor values?
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby clintrubber » 05 Jan 2017, 19:11

lietuvis wrote:Here is another interesting bass preamp (has minor errors) with variable low pass filter and switchable Q found on other forum.


Just curious which forum that was, I don't remember ...

(based on the file-names I'm fairly sure I did make those scans from a Dutch magazine)

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

Postby lietuvis » 07 Jan 2017, 01:16

clintrubber wrote:
lietuvis wrote:Here is another interesting bass preamp (has minor errors) with variable low pass filter and switchable Q found on other forum.


Just curious which forum that was, I don't remember ...

(based on the file-names I'm fairly sure I did make those scans from a Dutch magazine)

Bye


Well it is you by the name on the other forum, thank you for sharing, but if you want it to be removed ask administrators to delete it.
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Re: Fodera, Sadowsky, aguilar, and other bass preamps

Postby clintrubber » 07 Jan 2017, 01:47

No problem at all, only glad it might be of use. Was just curious where I had posted it - DIYSB ?

Have a good wknd
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby clintrubber » 07 Jan 2017, 14:29

Silent Fly wrote:Based on the indications supplied. It should be correct:
Sadowsky-pre (1.1).gif


Digging this Sadowsky preamp up from page 3.
It makes sense to have treble-cut as well, and that has indeed been added as the VTC (Vintage Tone Control...)

So you have four controls in total: Bass-Boost, Treble-Boost, Volume and Passive-Tone (Treble-Cut).

There are reasons for putting the Passive Tone control before the preamp,
as well as for putting it after the preamp.

Just curious, anybody an idea what the original does here ?

Image

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