BAJA SLO OVERDRIVE PEDAL 2018  [documentation]

Original effect designs complete with schematics, layouts and instructions. Freely contributed by members or found in printed or online publications. Cannot be used for commercial purposes without consent of the respective owners of the copyright.
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bajaman
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Post by bajaman »

Hot on the heels of my BAJA AFD OVERDRIVE PEDAL comes this little offering based on the frequency response characteristics of the Soldano SLO amplifier high gain channel. Once again I used the Philips BC547B transistors for the clipping stage and the low current low slew rate TL064 quad opamp for the input and output buffers and the two gain stages :D
This pedal has quite a different response characteristic when compared to the treble boosted AFD pedal - a fuller bottom end and less top end just like the amplifier it is based on. I do hope you take the time to build it - maybe someone can draw up a vero layout ( I always make the vero layout as I place the components starting with the quad opamp and then proceeding from the input through to the output).
I will be posting more high gain amplifier styled preamp overdrive pedals in the coming days / weeks/ months - I think I can do a better design of the Friedman BE-OD as well (one that does not oscillate and whistle out of tune :roll: ), so keep a lookout :wink:
One thing you will notice immediately - no tone control section :!: The reason being that this pedal is intended to be used in front of a clean Fender style amplifier which already has it's own tone controls, but if you really feel that you need to add a tone control just graft a tube screamer, big muff Pi, or marshal type passive tone stack on the output (before the level control but after the output buffer :wink: )
Have fun :thumbsup
bajaman
Baja SLO OVERDRIVE True bypass version with BC547B clippers 190118.GIF
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IMG_3489.JPG
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287m
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Post by 287m »

woah! Thanks Baja

are you in honeymoon with TL074 and Philips BC547B?

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roseblood11
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Post by roseblood11 »

Interesting! Would be nice to have a comparison video with this circuit: http://tagboardeffects.blogspot.de/2014 ... o-100.html

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Post by Ichabod_Crane »

bajaman wrote: [...]
maybe someone can draw up a vero layout
[...]
I don't understand why there's no a veroboard layout drawn yet, but there's a working board. :scratch: :?

I was trying to draw it, but more pictures to see better the position of the components could be useful. Some parts are overlapped. :thumbsup

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287m
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Post by 287m »

roseblood11 wrote:Interesting! Would be nice to have a comparison video with this circuit: http://tagboardeffects.blogspot.de/2014 ... o-100.html
honestly, not apple to apple
remember 'The reason being that this pedal is intended to be used in front of a clean Fender style amplifier which already has it's own tone controls'

and i know you did many vero layout, maybe you can compare that vero from tagboard with this https://1.bp.blogspot.com/-ycWbTsUptrg/ ... ON-100.PNG

or, if you JFET haters or JFETless guy, try this https://4.bp.blogspot.com/-ai2qklaTHEs/ ... ulator.PNG

then you can compare :thumbsup
Ichabod_Crane wrote:
bajaman wrote: [...]
maybe someone can draw up a vero layout
[...]
I don't understand why there's no a veroboard layout drawn yet, but there's a working board. :scratch: :?

I was trying to draw it, but more pictures to see better the position of the components could be useful. Some parts are overlapped. :thumbsup
Maybe Bajaman keep that vero art style for himself
and what i see, his layout and wiring not for majority veroboard builder
no crime to not share your own art and secret
===

here i go so far for *64 IC and onboard pots
sorry, have jumper :( and its hard to do BuGG style
and i must admit, for this, its easy to draw more small layout with vero or non onboard pots perf
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guide for perf builder, always compare with schematic in first post for value
guide for perf builder, always compare with schematic in first post for value

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Post by J0K3RX »

287m wrote: honestly, not apple to apple
remember 'The reason being that this pedal is intended to be used in front of a clean Fender style amplifier which already has it's own tone controls'

and i know you did many vero layout, maybe you can compare that vero from tagboard with this https://1.bp.blogspot.com/-ycWbTsUptrg/ ... ON-100.PNG

or, if you JFET haters or JFETless guy, try this https://4.bp.blogspot.com/-ai2qklaTHEs/ ... ulator.PNG

then you can compare :thumbsup
Both are excellent and highly recommend, TrueVAL is amazing!!

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Manfred
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Post by Manfred »

Am I right that the polarity of C14 on the PCB layout is probably wrong.
SLOOD.jpg
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287m
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Post by 287m »

No, Manfred. That C14 is 10u.
look at 1st post schemo in IC 1c

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Post by Manfred »

287m wrote:No, Manfred. That C14 is 10u.
look at 1st post schemo in IC 1c
Sorry, my fault.
C14 is connected to Vbias.

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287m
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Post by 287m »

Manfred wrote:
287m wrote:No, Manfred. That C14 is 10u.
look at 1st post schemo in IC 1c
Sorry, my fault.
C14 is connected to Vbias.
Cool bro, always happy when tracer like you watch noob like me. :thumbsup
==
and for 1590A builder, here for you :wink:
1590A - BAJA SLO-OD
1590A - BAJA SLO-OD

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sixthfloor
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Post by sixthfloor »

Sounds interesting, thanks Baja !

I drew a quick layout for this one. It's not very optimized, but it should fit in a 125B.

I just checked it visually, but didn't build it. So if someone builds it using the vero, please let me know :wink:

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Post by rcustoms »

Another PCB with pot`s
slo bajapcb.jpg
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Post by bajaman »

Hi rcustoms :D
Thanks for contributing a great pcb layout for this pedal project - 2 small errors.
1. there is a missing 470k from IC2b pin 5 to Vbias
2. C3 should be 2u2 not 22u
cheers
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Post by rcustoms »

oops sorry ,here we go again
slo bajapcb.jpg
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Post by marcao_cfh »

I'm curious about the gain. It's a hi gain od? Any chance of a soundclip? (I posted the same thing on the AFD OD because I'm curious about both of them XD)

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Post by marcao_cfh »

I made a 1590B layout that fits both AFD and SLO ODs. It was made to fit a 1590B with onboard pots. Still unverified. Also, the transistors I've used for the layout are 2N5088s, which have reverse pin orientation than BC547s.

Preview:
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Link to the PDF file

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Post by bajaman »

https://www.freestompboxes.org/viewtopic ... 13&t=28851
Check this out - the Baja SLO MkII version :wink:
cheers
bajaman
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