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 » 08 Nov 2012, 08:49

Here is the photoview of the SMD board :wink:
Baja three band active bass preamp SMD 051112 .bmp
300dpi

and a black and white view without the silkscreen legend
Baja three band active bass preamp SMD mono051112 .bmp
600dpi
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 08 Nov 2012, 09:07

I have the gerber files for the silkscreen and the copper (*.GBR) but the forum will not allow me to upload them :( :scratch:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby roseblood11 » 08 Nov 2012, 09:22

You could change the file extension to .TXT
Or use dropbox...
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 08 Nov 2012, 09:53

tried .txt ,.jpg, .bmp etc - none worked :(
email me if you need it :wink:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby darmstat » 08 Nov 2012, 18:13

This is my first attemp at using the Express SCH software to make a schematic for the Vente. Thanks for all the work Bajaman. Did you use 8 KHZ OR 12 KHZ for the treble frequency for the Fender 3 band eq?
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 08 Nov 2012, 19:39

Did you use 8 KHZ OR 12 KHZ for the treble frequency for the Fender 3 band eq?

ALL the info you need is in the schematic and the graphs :wink:

By the way - your schematic with OPA2134 op amp has many mistakes and WILL NOT work as drawn.
ALSO - OPA2134 draws much higher current than the low current TL062 or it's National Semiconductor equivalent the LF422 :secret:
The American Deluxe Fender Jazz Bass circuit is also powered by 18 volt NOT 9 volt which can easily overload (not in a nice way :wink: ) when extreme settings are used on the tone controls.

Who the hell is Vente anyway :?:

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

Postby darmstat » 08 Nov 2012, 20:10

You are right...I made a mistake with the first op-amp. The 1k should go to pin 3 of the op-amp. I will fix it, again my first time using new software....lol
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby darmstat » 08 Nov 2012, 20:29

Here is the revised Bena(Vente) 3 band eq.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 08 Nov 2012, 23:00

still some mistakes :wink:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby darmstat » 08 Nov 2012, 23:03

Ok...What may thoses mistakes be? Please.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 09 Nov 2012, 00:16

pin 4 of the first op amp should be connected to the junction of the 10k resistors and the +9v supply should be connected to pin 8 and pin 4 should be connected to ground :wink:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby deltafred » 09 Nov 2012, 00:47

darmstat wrote:Ok...What may thoses mistakes be? Please.

The reference (half supply) voltage divider is wrong, the resistors are correct, the caps aren't. You don't want a cap across the top reistor, it sould go across both resistors.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 09 Nov 2012, 01:02

The reference (half supply) voltage divider is wrong, the resistors are correct, the caps aren't. You don't want a cap across the top resistor, it should go across both resistors.

agreed, but in practice it makes very little difference in this case - only 47n in series with 47u which is 1000 times the size. In reality when running from a battery source the 47n is totally uneccessary and so is the diode unless you insist on connecting the battery the wrong way around :roll:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 09 Nov 2012, 01:04

For all those who do not want SMD board layout, I shall be designing a through hole component board layout in the next few days for my BAJA three band bass preamp :wink:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby darmstat » 09 Nov 2012, 02:44

That would be great Bajaman....through hole component board layout . I have revised my Benavente. Practice makes perfect.... :D
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 09 Nov 2012, 04:26

still NOT correct darmstat :roll:
see my post (4 back in this thread :wink: )
between the junction of the 10k resistors etc :secret:
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby darmstat » 09 Nov 2012, 04:34

Ok...I see it. wow...I really never make this many mistakes... :|
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby darmstat » 09 Nov 2012, 04:38

Ok...I hope i got it this time.
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby bajaman » 09 Nov 2012, 04:43

almost there - just connect pin 8 of the op amp to +9v and pin4 to ground and it will work properly :thumbsup
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Re: Fodera, Sadowsky, aguilar, and other preamps

Postby darmstat » 09 Nov 2012, 04:49

It is very sad Bajaman. I have built 2 of these and from a handwritten schematic. I try to use the software to make one schematic and it takes 4 tries. I should have just uploaded the handwritten one, but i wanted it to look nice.... :D Thanks for the help and believe me the preamp does work... :applause:
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