Catalinbread - Sabbra Cadabra  [traced]

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deltafred
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Post by deltafred »

That 820R still doesn't look right, it is now in parallel with the 10k. Maybe it should be in series with the 2u2.
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Post by DrNomis »

deltafred wrote:That 820R still doesn't look right, it is now in parallel with the 10k. Maybe it should be in series with the 2u2.

I agree, I had a look and the way it's shown in the schematic means that the capacitor is effectively shorted out by the 820 Ohm resistor, I have a feeling that the 820 Ohm resistor should really be connected between the cap's + terminal and the source of the Fet where it connects to the 10k resistor...... :hmmm:
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Post by marauder »

Brainfade when I wrote my notes down.

The 10k should be 820r, there's no other resistors connected to the source.

I'm surprised no one noticed the extra resistor.

BTW the 33K is the CLR. That thing must be really bright.

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Post by marmaliser »

SC.png

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mirosol
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Post by mirosol »

Added a power filter cap, series polarity protection and pulldown for the input..
Currently unverified.
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Catalinbread-SabbraCadabra.png
http://tagboardeffects.blogspot.com/
http://mirosol.kapsi.fi/
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juansolo
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Post by juansolo »

Very nice!

Fork is gain. It said fork on each pot I think to show which way the legs went.

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Post by juansolo »

Either that or he just had a thing for cutlery.

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andregarcia57
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Post by andregarcia57 »

can be used 2N5457?

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marauder
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Post by marauder »

I missed the 47uf and 1n4001 between the power rails on my schematic.

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Post by Matec »

Hello

I want to congratulate the people involved in the schematic design and layout, of the Sabbra Cadabra.
It was a great job.
 
I would like to make a note here:

In this schematic is missing the 1M resistor between the 100n capacitor and 33k resistor, near the gate of the first FET (Q1 on board). This resistor is what makes the polarization of the FET. This component appears in the schematic drawn by hand.

Another detail is that the terminals 1 and 2 of the Presence potentiometer, on the board, appear connected.

These two differences occur in the schematic and layout

I hope I helped. :oops:

Cheers

Matec

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marmaliser
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Post by marmaliser »

Thank you very much :oops:

Updated scheme
SC.png

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mirosol
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Post by mirosol »

Updated layout... Fix for the 1M is kinda crude, but it should work.
Attachments
Catalinbread-SabbraCadabra.png
http://tagboardeffects.blogspot.com/
http://mirosol.kapsi.fi/
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jalmonsalmon
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Post by jalmonsalmon »

Are there any other FETs that would work? I only have some 2n5457s on hand...
I suppose I need to buy the correct FETs for this one!
Nice layout!

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Nocentelli
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Post by Nocentelli »

It worked on the breadboard with 2N5457s for me, can't say whether it sounds the same as the original though.
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mirosol
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Post by mirosol »

Someone at our blog built the layout and it's working. Consider it verified.
+m
http://tagboardeffects.blogspot.com/
http://mirosol.kapsi.fi/
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Post by marauder »

I've got some MPF4393s on the way, so I'll compare with my original. Probably at the weekend.

The vero still hasn't got the 47uf on the power rails I mentioned earlier, but its easy enough to squeeze one in.

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mirosol
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Post by mirosol »

mirosol wrote:Added a power filter cap, series polarity protection and pulldown for the input..
Power filtering is in the layout (has been there all along). I drew it as 100µ since it was missing from the schematic. Use 47µ if you wish.
+m
http://tagboardeffects.blogspot.com/
http://mirosol.kapsi.fi/
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Post by jalmonsalmon »

I took a crack at this one with diptrace based off of the latest schematic,
Hopefully this is a working layout and thought I would share this PCB -
I am unable to order this project as of yet but will in the near future.
I am not that good at layouts but thought I would give back to this fantastic site! Fill free to point out any errors, I can take it! :slap:
https://oshpark.com/shared_projects/lNHrYYDM
I added the 47uF and diode for protection.
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Sabbra.pdf
(184.42 KiB) Downloaded 487 times

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storyboardist
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Post by storyboardist »

For those who like perf or to etch at home, here's my layout. If you want to use onboard pots, mount them from the solder-side of the board (gain and presence controls are oriented 180º from the range and volume controls).
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Catalinbread Sabbra Cadabra.png

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Post by juansolo »

Damn you guys are fast!

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