Catalinbread - Sabbra Cadabra  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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jalmonsalmon
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Post by jalmonsalmon »

jalmonsalmon wrote: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.
Here is an updated layout
https://oshpark.com/shared_projects/5YoHAwyH
I had the diode on the wrong net, but it is good now :oops:

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johnk
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Post by johnk »

I drew up my own PCB, etched it, built it up and it sounds great.

Image

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here's the layout for a BC184:

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and another one for the BC184L (which has a different pinout and is what I used)

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laerteandrade
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Post by laerteandrade »

and the mpf4392 , is it a possible replacement ? https://www.ebay.com/itm/MPF4392-Encaps ... 19d166994b

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jalmonsalmon
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Post by jalmonsalmon »

Small Bear has a MPF102 that should work.
also
the SOT version here if you want to mess with those little jfet daughter boards.
http://www.mouser.com/ProductDetail/ON- ... a1eyKp4%3d
Over on |v|arks blog I think someone verified mirosols using other fets
http://tagboardeffects.blogspot.com/201 ... 8771957863

and these should work really well that was mentioned on the blog as well
https://www.ebay.com/itm/50PCS-PN4393-E ... 1e8d35a217

I may score some of the fairchilds my self 8)

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johnk
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Post by johnk »

I first built mine with 2N5457's and it sounded great. I took them out and installed some 2N4393's once they arrived since that's what the original uses, but I really don't think that it sounds much different, if any.

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johnk
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Post by johnk »

got mine all boxed up. thanks for posting the schematic!
I also installed a relayed true bypass in it.

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jalmonsalmon
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Post by jalmonsalmon »

That is an awesome build there!
NICE :applause:

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juansolo
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Post by juansolo »

Most awesome!

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Mbas974
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Post by Mbas974 »

@johnk very net job !!
O.T. Which technique did you use for the enclosures, labels and color look more than standard build (!!) ..?

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roseblood11
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Post by roseblood11 »

some professional printers can use white toner or ink, have a look at druckeronkel.de...

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jalmonsalmon
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Post by jalmonsalmon »

P-Touch - white on clear and trimmed very neatly I might add. :applause:

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derringer
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Post by derringer »

https://www.freestompboxes.org/download/ ... &mode=view

I built from Storyboardist's version on perf but it just does not sound right.
I've never used Mu-Amps before so i don't know what to expect voltage-wise. I'm guessing that Q4's drain and Q5's source should be the same as the Q2/Q3's are? Any help or readings from a working model would be greatly appreciated.

Thanks

battery 8.5V

Q1
C: 5.7
B: 1.9
E: 1.2

Q2
D: 5.8
S: 1.4
G: 0

Q3
D: 8.3
S: 5.8
G: 4

Q4
D: 3.6
S: 0.9
G: 0

Q5
D: 8.3
S: 4.7
G: 3.9

Q6
D: 8.3
S: 3.7
G: 4.7

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derringer
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Post by derringer »

'twas a bad gain pot. Sounds like Sabbath.

Consider Storyboardist's layout verified.
And I used 2n5457s with a 2n3903 with a gain of about 140.

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Moska
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Post by Moska »

Hello Friends.
Here is a small contribution, checked layout :thumbsup

http://www.4shared.com/office/4nUy-opDc ... BRA_3.html

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juansolo
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Post by juansolo »

FWIW built it and compared it to the original and it's nailed on, so the trace was good ;) Nice to know ;)

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R.Rechia
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my favorite amplifier: Marshall Plexi and Fender Blues Jr.
Location: Brazil

Post by R.Rechia »

Awesome guys! Iommi tones blowing my mind! \m/

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jalmonsalmon
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Post by jalmonsalmon »

OSHPARK board I did is verified and new link here:
https://oshpark.com/shared_projects/JjaHpX4O

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andregarcia57
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Post by andregarcia57 »

I managed to find the transistors MPF4393, but my pedal is very high gain. How can I change to a little less gain?

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66archer
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Post by 66archer »

Can you post EasyEDA files please? Schematics and PCB.
Thanks in advance!
Gabriel

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66archer
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Post by 66archer »

Can anyone upload gerber files please? Thanks!

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