125B · 4 knobs
Menatone PigVerified
Based on the Menatone Pig· 2 other boards clone it
- Category
- Preamp / Amp-in-a-box
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Amp Emulator, Menatone, Overdrive
From the post
Came across this one and it's an interesting JFET-based OD with active bass and treble controls. It's apparently based on a late-60s Marshall 200 amp. Drew up the schematic for reference.
I believe the originals run off a 9v supply, but newer ones have a voltage doubler internally to run off 18v. Since I know there are different preferences when it comes to those, so I left it off the board. I realized after I drew all this up I probably should have included trimmers for biasing the JFETs, so you may want to socket the resistors going from voltage to the drain of Q1, Q3, and Q4-6. Though if you're using in-spec J201s (I highly suggest the SMD version and conversion boards) the stock values will probably work fine. YMMV Pots are board mounted and will fit nicely in a 125B.
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 30 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×4 | 100K | 100k | read from the layout by eye | |
| ×2 | 220K | 220k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×7 | 1.8K | 1.8k | read from the layout by eye | |
| ×3 | 470K | 470k | read from the layout by eye | |
| ×4 | 33K | 33k | read from the layout by eye | |
| ×1 | 27K | 27k | read from the layout by eye | |
| ×1 | 68K | 68k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| Capacitors 8 | ||||
| ×5 | 22nF | 22n | read from the layout by eye | |
| ×6 | 4.7nF | 4.7n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×1 | 470pF | 470p | read from the layout by eye | |
| ×2 | 100pF | 100p | read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| ×3 | 22uF | 22u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 6 | ||||
| Q1 | J201 | J201 | JFET; read from the layout by eye | |
| Q2 | J201 | J201 | JFET; read from the layout by eye | |
| Q3 | J201 | J201 | JFET; read from the layout by eye | |
| Q4 | J201 | J201 | JFET; read from the layout by eye | |
| Q5 | J201 | J201 | JFET; read from the layout by eye | |
| Q6 | J201 | J201 | JFET; read from the layout by eye | |
| Potentiometers 4 | ||||
| Treble | B1M | B1M | Potentiometer | read from the layout by eye |
| Bass | B500K | B500k | Potentiometer | read from the layout by eye |
| Gain | A1M | A1M | Potentiometer | read from the layout by eye |
| Volume | A250K | A250k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×1 | 100K | 100k | read from the layout by eye | |
Other boards based on the Menatone Pig
- Menatone Pig Dirtbox Layouts
- Menatone Pig Tagboard Effects