Enclosure not stated · 4 knobs
Blackout Effectors Mantra Overdrive
Based on the Blackout Effectors Mantra· 7 other boards clone it
From the post
Here's a great sounding overdrive from Blackout Effectors. It features a 2-band EQ and the standard drive and volume controls. The topology of the circuit is reminiscent of the classic Big Muff, (input amplifier, gain stage, gain stage, EQ, gan recovery stage) but the components are completely different. Here's the schematic for reference. Adjust the trimmers to around 6.2v, then fine tune by ear if necessary.
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 29 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×9 | 10K | 10k | read from the layout by eye | |
| ×3 | 470K | 470k | read from the layout by eye | |
| ×6 | 2.2M | 2.2M | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×1 | 390K | 390k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| Capacitors 10 | ||||
| ×4 | 47pF | 47p | read from the layout by eye | |
| ×2 | 470pF | 470p | read from the layout by eye | |
| ×1 | 680pF | 680p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×2 | 3.3nF | 3.3n | read from the layout by eye | |
| ×4 | 10nF | 10n | read from the layout by eye | |
| ×4 | 100nF | 100n | read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| D1 | ? | ? | value not given; read from the layout by eye | |
| D2 | ? | ? | value not given; read from the layout by eye | |
| D3 | ? | ? | value not given; read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | 2N7000 | 2N7000 | MOSFET; read from the layout by eye | |
| Q2 | 2N7000 | 2N7000 | MOSFET; 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 | |
| Potentiometers 4 | ||||
| Treble | A100K | A100k | Potentiometer | read from the layout by eye |
| Bass | A100K | A100k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Gain | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×2 | 150K | 150k | read from the layout by eye | |
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