125B · 5 knobs
Valve Wizard Engineer's ThumbVerified
Based on the Valve Wizard Engineer's Thumb· 8 other boards clone it
- Category
- Compressor
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Compressor, Valve Wizard
From the post
A little blog update: You may have noticed there wasn't a post yesterday and that there is one today. Why on a Tuesday and not a Monday? Some big-ish changes are coming to the site in the near future, which (along with a bunch of other small things) is taking up a lot of my free time. So don't freak out. I'm still here. Layouts are still coming. Just not quite as frequently (2 a week instead of 3). Now that that's out of the way...
Here's the 5-knob version of the Engineer's Thumb compressor. Been meaning to do this one for a while and decided to do it in Eagle. It's generally considered a Dyna-Comp/Ross Comp killer, and uses one side of an LM13700 chip in place of the old CA3080. This one will fit in a 125B with all 5 pots board mounted. The Bright switch is off board, but that's just 2 wires. If you don't feel like etching, you can get a board fabricated off OshPark. Original info on the circuit by the designer can be found here.
Build doc here with schematic, BOM, and drilling template.
Schematic
This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 37 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 2 values the reader of this layout was not sure of
- C3 (round can at the top right, between the Attack pot pads): the designator is tiny and faint, read as C3 by elimination since C1, C2, C4-C8 are found elsewhere
- D1 and D2 (above the IN/GND/+9V/OUT pads): outlines look like LEDs or small radial parts rather than axial diodes; listed as D
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 13 | ||||
| R1 | ? | ? | value not given; read from the layout by eye | |
| R2 | ? | ? | value not given; read from the layout by eye | |
| R3 | ? | ? | value not given; read from the layout by eye | |
| R4 | ? | ? | value not given; read from the layout by eye | |
| R5 | ? | ? | value not given; read from the layout by eye | |
| R6 | ? | ? | value not given; read from the layout by eye | |
| R7 | ? | ? | value not given; read from the layout by eye | |
| R8 | ? | ? | value not given; read from the layout by eye | |
| R9 | ? | ? | value not given; read from the layout by eye | |
| R10 | ? | ? | value not given; read from the layout by eye | |
| R11 | ? | ? | value not given; read from the layout by eye | |
| R12 | ? | ? | value not given; read from the layout by eye | |
| R13 | ? | ? | value not given; read from the layout by eye | |
| Capacitors 8 | ||||
| C1 | ? | ? | value not given; read from the layout by eye | |
| C2 | ? | ? | value not given; read from the layout by eye | |
| C3 | ? | ? | electrolytic, value not given; read from the layout by eye | |
| C4 | ? | ? | electrolytic, value not given; read from the layout by eye | |
| C5 | ? | ? | value not given; read from the layout by eye | |
| C6 | ? | ? | electrolytic, value not given; read from the layout by eye | |
| C7 | ? | ? | electrolytic, value not given; read from the layout by eye | |
| C8 | ? | ? | electrolytic, value not given; read from the layout by eye | |
| Diodes 6 | ||||
| D1 | ? | ? | value not given; drawn with a round LED-style outline; read from the layout by eye | |
| D2 | ? | ? | value not given; drawn with a round LED-style outline; read from the layout by eye | |
| D3 | ? | ? | value not given; read from the layout by eye | |
| D4 | ? | ? | value not given; read from the layout by eye | |
| D5 | ? | ? | value not given; read from the layout by eye | |
| D6 | ? | ? | value not given; read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | ? | ? | value not given; read from the layout by eye | |
| ICs 3 | ||||
| IC1 | ? | ? | 8-pin, value not given; read from the layout by eye | |
| IC2 | ? | ? | 8-pin, value not given; read from the layout by eye | |
| IC3 | ? | ? | 16-pin, value not given; read from the layout by eye | |
| Potentiometers 5 | ||||
| Release | ? | ? | Potentiometer | value not given; read from the layout by eye |
| Attack | ? | ? | Potentiometer | value not given; read from the layout by eye |
| Threshold | ? | ? | Potentiometer | value not given; read from the layout by eye |
| Ratio | ? | ? | Potentiometer | value not given; read from the layout by eye |
| Level | ? | ? | Potentiometer | value not given; read from the layout by eye |
| Switches 1 | ||||
| Bright | ? | ? | two pads on the board, type not given; read from the layout by eye | |
Other boards based on the Valve Wizard Engineer's Thumb
- Nomad Aion FX · 125B · $12.50
- Conductor's Hand delyk PCBs · 1590B
- Engineers Thumb Five Cats Pedals · 1590B · £4.50
- Engineer's Thumb Compressor Fuzz Dog · 1590B · £39.60
- Engineer's Thumb Compressor JMK PCBs · 1590B · $12.00
- Mini Comp JMK PCBs
- Thumb Sucker Compressor PedalPCB · 125B · $12.00
- Engineer's Thumb Tagboard Effects · 1590B