UBE Screamer 1.1.1 build

Built and tested the new version of the UBE Screamer PCB. Everything is working! Sounds great. This is a good alternative to the standard TS-808 and other overdrives if you’re looking for something a little different. Does great low gain sounds.

I built this in a 1590B enclosure from Tayda. I got most of the parts from Tayda as well. They still the 4049UBE Hex inverter. The cost was about $20. The build is easy. With all of the pots and LED mounted to the board the assembly simple. I used the same layout used over at PedalPCB.com for the PCBs. Power connections are at the top and all off board wiring is at the bottom.

You can build this project for yourself. Follow the build guide here. Or buy one already built from my Reverb Shop!

22/7 PCB Order

I just got these PCBs in the mail from https://www.pcbway.comPCBWay.com. I’m impressed with the quality. This is an update of my my 22/7 PCB. I made a couple small improvements.

The 22/7 is a CMOS based Big Muff. A very cool and innovative circuit by RunOffGroove.com. Did I mention they just turned 20 years! If you like the Big Muff but would like something a little different try this.

22/7 on OSH Park

Built and test this second version of the 22/7 by RunOffGroove.com. Sounds good. This is a great alternative for Big Muff fans. The OSHPark project is public and verified.

22/7 is a Big Muff built around CMOS inverters in place of the transistors used in the traditional BMP circuit. The CMOS inverters have a tube like sound when over driven.

You can order boards for this project at PCBWay.com. I have two versions of the board. One uses the 4049 and the other uses the 4069. Otherwise the rest of the parts are the same.

Order PCB here: 22/7 PCBs on OSHPARK

Parts List

C1        100µ
C2                   33n
C3            100n
C4             220p
C5               150p
C6                150p
C7             100n
C8              100n
C9                  3n3
C10                6n8
C11                 10n
C12                10n
C13               100n
C14               150p
C15     100n
D1-4    1N914
D5              1N5817
D6           LED
IC1       CD4049UBE
R1      100K
R2                 470
R3       1M
R4       1K
R5      33K
R6       1M
R7        33K
R8       1M
R9        39K
R10         27K
R11                  1M
R12      1M
R13               330K
R14           100K
R15         RLED
TONE    B100K 16MM


If you don’t want to build your own this one is for sale on Reverb.

Harvesting Parts!

Harvesting parts from these old PCBs. I had this need for a A100K pot and Christmas 🎄 has holding up the deliver from Tayda Electronics. So I started digging through my bin of old projects that never made it into a box 📦.

I didn’t my ideal A100K pot, it would have been 16mm with legs, but I did find a couple 12mm pots which might sub. These have a D shaped shaft which makes them harder to fit for knobs.

While not finding what I was looking for was disappointing, I think I may have raided this bin at an earlier date, I did find some surprises. I found at least a half dozen J201 Fets, and a 4049UBE hex inverters. The J201s are great for stomp boxes and hard to get these days.

There was also a few 3PDT switches and a bunch of 1/4” jacks along with a handful of other things. Switches and jacks can always find some use. Personally I prefer the open frame Switchcraft jacks but these plastic ones are a good second choice.

UBE Screamer PCB v1.1

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.

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.

Order Boards from PCBWay.com

Order PCBs at OSH Park


C1      10n
C2      2n2
C3        470n
C4       100n
C5        1n5
C6        150p
C7         100n
C8       100n
C9        100n
C10       100u
D1        1n4148
D2         1n4148
D3         1n5817
D4             LED
IC1      CD4049UBE
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
TONE   B500k 16MM      
VOL      B100k 16MM    
GAIN    B500k 16MM
UBE Screamer Parts list


Build your own! Or buy this one at my Reverb shop.

UBE Screamer by RunOffGroove

This UBE Screamer by RunOffGroove.com is a unique twist on the venerable Ibanez Tube Screamer TS-808. It replaces the op-amps and transistor stages with a single hex inverter using an inverter in place of each op-amp and transistor. This has a great sound that stands up to all of the other overdrives. Read more about it over at RunOffGroove.com

Well worth the effort, build it yourself! I’ve created a public project at OSH Park. Order boards and follow the build docs.

More OSH Park PCBs

These are some more PCBs from OSH Park. There is an IC Big Muff, Tube Steak, and a Woolly Mammoth.

The Tube Steak I created from a schematic posted by Charlie Barth at Moosapotamus.net. Tube Steak Fuzz is a cross between the Tube Sound Fuzz, and Way Huge Fat Sandwich. Here’s a link to Charlie’s article read it for yourself: Tube Steak Fuzz.

The IC Big Muff also called the op-amp Big Muff was a version of the Big Muff that used two op-amps in place of the four transistors used in the classic Big Muff Design. Here is a link to more information in the op-amp Big Muff.

The Woolly Mammoth is a PCB design that I made as a clone of the ZVex Woolly Mammoth. I really like the sound of this one. Designed as a fuzz for bass, it sounds good with guitar also. The design is based on the Fuzz Face.