Fodera, Sadowsky, aguilar, and other bass preamps

Stompboxes circuits published in magazines, books or on DIY electronics websites.
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bajaman
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Post by bajaman »

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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darmstat
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Post by darmstat »

Did you breadboard it or did just build on perf or stripboard?

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Duckman
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Post by Duckman »

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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BAJA 3 BAND FENDER BASS PRE.pdf
(54.12 KiB) Downloaded 440 times

darmstat
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Post by darmstat »

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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Post by bajaman »

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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bajaman
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Post by bajaman »

thanks Duckman :thumbsup
You saved me the effort :hug:
nice looking layout too! :wink:
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Duckman
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Post by Duckman »

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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Post by darmstat »

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

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Post by bajaman »

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 small.bmp (672.71 KiB) Viewed 472 times
Baja three band active bass preamp through hole 101112 rear small.bmp
Baja three band active bass preamp through hole 101112 rear small.bmp (672.71 KiB) Viewed 472 times
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 :!:
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Duckman
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Post by Duckman »

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

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Post by bajaman »

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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Duckman
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Post by Duckman »

: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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Baja 3 Band Fender Bass Pre.pdf
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Post by bajaman »

Here is a 300 dpi paleted bitmap image for the Fender preamp
Baja three band active bass preamp through hole 101112 copper.bmp
Baja three band active bass preamp through hole 101112 copper.bmp (908.55 KiB) Viewed 445 times
- 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
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Post by Duckman »

Here's the darmstat's Benavente, re-drawn just to clarify
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BENAVENTE 3 BAND EQ-165.bmp
BENAVENTE 3 BAND EQ-165.bmp (262.99 KiB) Viewed 439 times

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Post by bajaman »

the benavente looks very much like the Fender circuit :wink:
BUT - where is the volume level control fitted ? :hmmm:
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Post by bajaman »

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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Post by DrNomis »

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


Are there any copyright issues with Fender?..... :hmmm:
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Post by Duckman »

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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Post by bajaman »

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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Post by roseblood11 »

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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