125B · 5 knobs
From the post
Someone requested the Openhaus which, to be honest upon pulling up the schematic, made my eyes glaze over. It's big. But I came across a stripped down version on Sabrotone and it felt much more doable. So here you go! It'll fit in a 125B with top mounted jacks and both footswitches. I'll leave the method of the voltage doubling up to you.
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 48 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 50pF ceramic left of IC2: printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 19 | ||||
| ×2 | 150Ω | 150 | read from the layout by eye | |
| ×1 | 220Ω | 220 | read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 680Ω | 680 | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×2 | 1.2K | 1.2k | read from the layout by eye | |
| ×2 | 1.8K | 1.8k | read from the layout by eye | |
| ×1 | 6.8K | 6.8k | read from the layout by eye | |
| ×6 | 10K | 10k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 33K | 33k | read from the layout by eye | |
| ×2 | 47K | 47k | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×2 | 100K | 100k | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×2 | 680K | 680k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| Capacitors 15 | ||||
| ×1 | 50pF | 50p | read from the layout by eye | |
| ×1 | 220pF | 220p | read from the layout by eye | |
| ×1 | 470pF | 470p | read from the layout by eye | |
| ×1 | 560pF | 560p | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 15nF | 15n | read from the layout by eye | |
| ×2 | 22nF | 22n | read from the layout by eye | |
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×4 | 100nF | 100n | read from the layout by eye | |
| ×1 | 150nF | 150n | read from the layout by eye | |
| ×1 | 470nF | 470n | box film; read from the layout by eye | |
| ×1 | 1uF | 1u | box film; read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | printed 4001; read from the layout by eye | |
| Transistors 5 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| Q2 | LND150N3-G | LND150N3-G | depletion MOSFET; read from the layout by eye | |
| Q3 | 2N1306 | 2N1306 | read from the layout by eye | |
| Q4 | 2N1306 | 2N1306 | read from the layout by eye | |
| Q5 | LND150N3-G | LND150N3-G | depletion MOSFET; read from the layout by eye | |
| ICs 2 | ||||
| IC1 | OPA2604AP | OPA2604AP | read from the layout by eye | |
| IC2 | OPA2604AP | OPA2604AP | read from the layout by eye | |
| Potentiometers 5 | ||||
| Gain | A10K | A10k | Potentiometer | read from the layout by eye |
| Volume | A10K | A10k | Potentiometer | read from the layout by eye |
| Mid | B10K | B10k | Potentiometer | read from the layout by eye |
| Bass | B10K | B10k | Potentiometer | read from the layout by eye |
| Treble | B10K | B10k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Switch | SPST on/off | SPST ON/OFF | Sw1/Sw2 pads; can be toggle or footswitch; read from the layout by eye | |