This is the second version of the UBE Screamer board. This version fixes a mistake with the reverse polarity diode. I’m calling this ready for public consumption and will add it to the OSH Park projects pages soon.
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The enclosure is grounded through the jacks. The bottom cover though doesn’t make an electrical connection to the main enclosure body due to the powder coat. I used a drill bit to remove the powder coat inside the count sink recess, this allows the screw to make contact with the back cover for full shielding.
I recently updated the board with a few minor changes. You can order the updated board from PCBWay.com.
Check out my other shared projects here!
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2021/12/9174EC42-79D1-441E-80A0-3FAA4AEF2854-540x720.jpeg?resize=540%2C720)
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Partslist
Capacitors | |
C1 | 10n |
C2 | 2n2 |
C3 | 470n |
C4 | 100n |
C5 | 1n5 |
C6 | 150p |
C7 | 100n |
C8 | 100n |
C9 | 100n |
C10 | 100u |
Diodes | |
D1 | 1n4148 |
D2 | 1n4148 |
D3 | 1n5817 |
D4 | LED |
IC | |
IC1 | CD4049UBE |
Resistors | |
R1 1M | 1M |
R2 | 470k |
R3 | 470k |
R4 | 100k |
R5 | 100k |
R6 | 10k |
R7 | 1m |
R8 | 10k |
R9 | 100k |
R10 | 100k |
R11 | 100k |
R12 | 220k |
R13 | Rx (see note) |
R14 | 330 |
R15 | RLED |
Pots | |
TONE | B500k 16MM |
VOL | B100k 16MM |
GAIN | B500k 16MM |
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2021/08/UBE-Screamer-Schematic.png?resize=2926%2C874)
Wiring
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2021/07/UBE-Screamer-Wiring.png?resize=562%2C1084)
![](https://i0.wp.com/www.super-freq.com/wp-content/uploads/2021/08/UBE-Screamer-Drill.png?resize=1336%2C1944)
Build your own! Or buy this one at my Reverb shop.
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