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 bajaman » 09 Nov 2012, 04:54

I believe you darmstat :wink:
Just concerned for those folks who will try to build it from an incorrectly drawn schematic and then the inevitable " I built this tone control but it just makes this funny farting noise and has very low output.....etc. Can you tell me what i am doing wrong etc." :roll:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby darmstat » 09 Nov 2012, 04:57

Did you breadboard it or did just build on perf or stripboard?
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby Duckman » 09 Nov 2012, 05:07

Here is a PDF with my single sided trough hole PCB version.
73mm x 37mm. Admits on board pots (long leg)
Ground plane version and trace ground version included.
Hope it helps.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby darmstat » 09 Nov 2012, 05:17

Bajaman...I hope i did not side track you from the Fender with the Benavente build and schematic. I breadboarded the Benavente just a few minutes again and did not get any unpleasant noises. No farting or low output.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 09 Nov 2012, 06:21

yes darmstat :roll:
BUT YOU PROBABLY CONNECTED PIN 8 of the opamp to +9v and PIN 4 of the opamp to GROUND :!:
My comment was that your schematic DOES NOT SHOW THESE CONNECTIONS :!: :!: :!: :roll:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 09 Nov 2012, 06:23

thanks Duckman :thumbsup
You saved me the effort :hug:
nice looking layout too! :wink:
cheers
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby Duckman » 09 Nov 2012, 15:17

Thanks, Baja! Just a try to give back a little to this endless fountain of info.
Any way, I'll always look for your personal experienced vision. :wink:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby darmstat » 09 Nov 2012, 15:54

Here is the Benavente with the connection for 9 volt and ground.... :applause:

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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 10 Nov 2012, 10:04

Thanks to Duckman (and Sprint Layout v5.0), I have managed to shrink Duckman's through hole board layout for the Fender American Deluxe Jazz Bass Active preamp down to the same size as the SMD layout which I previously posted in this thread.
Here are some bitmap photoviews taken from Sprint Layout V5.0 ( I LOVE this PCB drawing program :secret: :wink: ).
The first bitmap image shows the silkscreen top layer with an X-Ray view of the bottom layer tracks.
The second image shows the bottom layer copper tracks with an X-Ray view of the silkscreen top layer.
Enjoy :wink:
bajaman
Baja three band active bass preamp through hole 101112 small.bmp

Baja three band active bass preamp through hole 101112 rear small.bmp

As a foot note :)
This preamp is designed for +18 volt operation - (My earlier SMD board post wrongly shows +9 volt :slap: )
Although it will work on +9 volt, the CORRECT +18 VOLT SUPPLY will provide for a much greater headroom and freedom from clipping when the controls are maxed out :!:
Cheers
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby Duckman » 10 Nov 2012, 15:21

:applause: I knew it!
Great! Nice and neat!
What's the final size?

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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 10 Nov 2012, 21:31

approximately 59mm x 28mm :wink: ( pretty much the same size as the original Fender SMD board )

Your layout saved me a lot of time Duckman :thumbsup
Thank you :hug:
cheers
bajaman

ps: your original pdf artwork is missing the ground connection traces to the input and output level potentiometer :secret:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby Duckman » 10 Nov 2012, 22:16

:oops: Dammit! :slap: Thanks for pointing it, Baja!
Now is corrected for those who like more spaced layouts :mrgreen:
Seriously Baja, your work is great.

It would be nice if some moderator please delete the previous .pdf I posted, since include that big mistake.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 10 Nov 2012, 23:35

Here is a 300 dpi paleted bitmap image for the Fender preamp
Baja three band active bass preamp through hole 101112 copper.bmp
- unfortunately the forum does not allow me to upload gerber files, so I traced the photoviews posted earlier in CorelDraw and increased some of the trace widths to conserve etching solution :wink:
This is the largest dpi image that I can upload because the forum restricts files to under 1 Megabytes :(
Anyway - if you want to etch a board yourself , this may be helpful.
Thanks again to Duckman whose layout I have shrunken down for this Fender board sized layout :thumbsup
cheers
bajaman
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby Duckman » 11 Nov 2012, 03:02

Here's the darmstat's Benavente, re-drawn just to clarify
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 11 Nov 2012, 04:07

the benavente looks very much like the Fender circuit :wink:
BUT - where is the volume level control fitted ? :hmmm:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 11 Nov 2012, 04:12

I have a design for the two band passive ladder Sadowsky (fet version of the Fender Bassman 100 tube preamp :roll: ) preamp.
My version runs at about a 10th of the current - extremely low noise AND long battery life.
I have built it into two of my bass guitars and am very pleased with it's performance (but then I always have been a BIG fan of Leo Fender - a true genius).
Perhaps i should post it :hmmm:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby DrNomis » 11 Nov 2012, 04:29

I reckon you should post it Bajaman, but it's really up to you..... :thumbsup


Are there any copyright issues with Fender?..... :hmmm:
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby Duckman » 11 Nov 2012, 17:26

bajaman wrote:where is the volume level control fitted ? :hmmm:

I just redrawn darmstat's work... don't kill the messenger! :lol:
bajaman wrote:Perhaps i should post it :hmmm:

Well... you're in the right thread :lol:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 11 Nov 2012, 20:01

I just redrawn darmstat's work... don't kill the messenger! :lol:

Sorry, I should have addressed the question to darmstat :wink:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby roseblood11 » 11 Nov 2012, 21:35

Nice layout bajaman, thx! I'll definitely give it a try in my wife's Ibanez SRX 700 NT.

3 hints...
-your black is dark grey
-if you save the file as GIF, it has 28.8kB
-if you want to post a gerber file, just change the file extension to .txt

regards, Immo
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