Fodera, Sadowsky, aguilar, and other bass preamps

bajaman · Post by **bajaman** » 11 Nov 2012, 20:40

hello Immo

Sorry about the dark grey - I was trying to get the best resolution artwork for under the 1M posting limit

I think I tried posting the gerber files as .txt (and many other formats)
I will try again and see.
cheers
Steve

bajaman · Post by **bajaman** » 11 Nov 2012, 20:49

OKAY
I tried to upload the gerber files as *.txt and got the message that txt files are NOT allowed.
I give up

bajaman

bajaman · Post by **bajaman** » 11 Nov 2012, 20:54

the gif file as requested

lietuvis · Post by **lietuvis** » 11 Nov 2012, 22:19

bajaman wrote:OKAY
I tried to upload the gerber files as *.txt and got the message that txt files are NOT allowed.
I give up
bajaman

Hi Bajaman you can try to upload a zip file, previously I was able to do so. right click on mouse then compress file or a few files on mac os, something similar would be in windows, name it whatever you want and upload if its under allowed size to forum

bajaman · Post by **bajaman** » 11 Nov 2012, 23:22

Baja three band jazz bass preamp gerber files.zip: (20.71 KiB) Downloaded 483 times

Okay - thanks for the suggestion lietuvis

Here is a zip file containing the gerber files for both SMD and through hole boards

They are both together, but if you know how to use gerber files you should now how to edit them to suit your chosen format

cheers
bajaman

bajaman · Post by **bajaman** » 17 Nov 2012, 05:53

RE: BAJA three band active bass preamp:
Here is a more friendly component value schematic for the through hole board layout.

I very much doubt that you would hear any difference to the 051112 schematic previously posted in this thread, but I am sure you will find the components much easier to find.
You can use either the LF442 or TL062 (both are equivalent bifet input low current drain op amps for extended battery life

)
I just finished populating a through hole board with these component values - it will be a wee while before I can install it in the Jazz bass I am putting together though - I have to make the body first

I already have the neck, machine heads, pickguard, control plate and pick ups (neodymium button magnet and steel pole piece design) sorted, so won't be too long before I can play it

cheers
bajaman

bajaman · Post by **bajaman** » 17 Nov 2012, 06:21

: Baja three band active bass preamp through hole board 171112 .gif (70.47 KiB) Viewed 5934 times

here is a quick scan of the completed PCB

missing capacitor (470n) is smd on rear of board

NO noisy carbon comp capacitors fitted

cheers
bajaman

alexradium · Post by **alexradium** » 17 Nov 2012, 10:00

this is cool,what are the center frequencies for each band?
I'd like to know if there is an existing board with fixed B and T and parametric mids all in one,otherwise i could try to design it myself.
That with a 20dB boost would be the end of all pres.

bajaman · Post by **bajaman** » 17 Nov 2012, 10:11

this is cool,what are the center frequencies for each band?

look back in the thread

- see the graphs

HINT: halfway down page 5

That with a 20dB boost would be the end of all pres.

Way too much boost

alexradium · Post by **alexradium** » 17 Nov 2012, 10:37

ok thank you

Duckman · Post by **Duckman** » 17 Nov 2012, 16:57

bajaman wrote:
Baja three band active bass preamp through hole board 171112 .gif
here is a quick scan of the completed PCB
missing capacitor (470n) is smd on rear of board
NO noisy carbon comp capacitors fitted
cheers
bajaman

Looks really beautiful! Baja, you´re a master!

rcustoms · Post by **rcustoms** » 04 Dec 2012, 01:54

my contribution
a complete project on the yamaha's type preamplifier founded in many brands,who cloned this circuit

YAMAHA TMB.pdf: complete project; (1.91 MiB) Downloaded 707 times

I hope you enjoy

rcustoms · Post by **rcustoms** » 04 Dec 2012, 02:10

another ,peavey cirrus bass

: cirrus bass.bmp (897.25 KiB) Viewed 5857 times

: cirrus bass.bmp2.bmp (898.3 KiB) Viewed 5857 times

ezugaru · Post by **ezugaru** » 18 Dec 2012, 01:39

bajaman wrote:RE: BAJA three band active bass preamp:
Here is a more friendly component value schematic for the through hole board layout.
multisim baja three band active bass preamp 171112.png
I very much doubt that you would hear any difference to the 051112 schematic previously posted in this thread, but I am sure you will find the components much easier to find.
You can use either the LF442 or TL062 (both are equivalent bifet input low current drain op amps for extended battery life )
I just finished populating a through hole board with these component values - it will be a wee while before I can install it in the Jazz bass I am putting together though - I have to make the body first I already have the neck, machine heads, pickguard, control plate and pick ups (neodymium button magnet and steel pole piece design) sorted, so won't be too long before I can play it
cheers
bajaman

Hi bajaman, there is no C12 right? it jumps from C11 to C13, greethings!

bajaman · Post by **bajaman** » 18 Dec 2012, 01:45

Hi bajaman, there is no C12 right? it jumps from C11 to C13, greethings!

correct

B3ar · Post by **B3ar** » 17 Feb 2013, 23:01

Hidden tracks on SMD are a pain. And it's always a little odd to trace a partially populated board. SoI'm pretty much giving up on this, the active circuit from my 4 string Dearmond Pilot pro. I'm just gonna assume standard BF Fender-style TMB unless I get a bug to follow through on the trace.

The external connections are on the PDF.

alexradium · Post by **alexradium** » 18 Feb 2013, 06:53

[quotes="B3ar"]Hidden tracks on SMD are a pain. And it's always a little odd to trace a partially populated board. SoI'm pretty much giving up on this, the active circuit from my 4 string Dearmond Pilot pro. I'm just gonna assume standard BF Fender-style TMB unless I get a bug to follow through on the trace.

The external connections are on the PDF.[/quote]

This is the same Board on the Cort gb75 i had
I did tracing and its all based on gyrators

B3ar · Post by **B3ar** » 18 Feb 2013, 13:36

alexradium wrote:[quotes="B3ar"]Hidden tracks on SMD are a pain. And it's always a little odd to trace a partially populated board. SoI'm pretty much giving up on this, the active circuit from my 4 string Dearmond Pilot pro. I'm just gonna assume standard BF Fender-style TMB unless I get a bug to follow through on the trace.

The external connections are on the PDF.

This is the same Board on the Cort gb75 i had
I did tracing and its all based on gyrators[/quote]

You know, if I had thought about that, I might have started to look at Cort as it's Korean made. Thanks for saving me the effort on this.

rcustoms · Post by **rcustoms** » 19 Feb 2013, 02:40

B3ar wrote:Hidden tracks on SMD are a pain. And it's always a little odd to trace a partially populated board. SoI'm pretty much giving up on this, the active circuit from my 4 string Dearmond Pilot pro. I'm just gonna assume standard BF Fender-style TMB unless I get a bug to follow through on the trace.

The external connections are on the PDF.

ok folks ,let me help ,i been working on this version of the circuit and has two additional trimmers and a little few more components.i trace everything and this is my work,not checked, but I think together we can finish.

PRE CURBOW AND PILOT.pdf: (95.79 KiB) Downloaded 482 times

I made this PCB with no SMD components

PRE CURBOW AND PILOT 2.pdf: (184.02 KiB) Downloaded 435 times

rcustoms · Post by **rcustoms** » 20 Feb 2013, 03:55

wiring and trimmers func.