Enclosure not stated · 3 knobs
MXR Phase 45 with JC Maillet's Vibe mods
Based on the MXR Phase 45· 12 other boards clone it
- Category
- Phaser
- Price
- see vendor
From the vendor
The two-stage MXR Phase 45 with JC Maillet's mods to make it more Uni-Vibe-like: switchable Uni-Vibe-style 10:1 phase-shift cap pairs, a Rate LED, an external Bias control, a faster speed range and a Mix pot for a pitch-shifting vibrato mode. The post notes that small-box 'Vibes such as the Lovepedal Magicboy Vibe are based on the Phase 45. The 2N5458 JFETs must be matched.
[1] A switch selects Uni-Vibe 10:1 ratio cap pairs in the two phase stages. [2] LED rate indicator (2.4K and LED). [3] External Bias control (100K pot between two 47k resistors). [4] Two 8k2 resistors in parallel (4.1K) in series with the Speed pot. [5] Mix pot for a phaser / pitch-shifting vibrato mode.
Schematic
The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.
Parts list 50 rows
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Check before you build · 2 values the reader of this schematic was not sure of
- The resistors drawn in italic in the LFO and at the output are small and read as 150k; the one from +9V is the least clear.
- The second stage's cap pair reads .047 and .1 (the first stage .047 and .01).
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 27 | ||||
| R1 | 10K | 10k | read from the schematic by eye | |
| R2 | 22K | 22k | read from the schematic by eye | |
| R3 | 470K | 470k | read from the schematic by eye | |
| R4 | 10K | 10k | bias supply; read from the schematic by eye | |
| R5 | 10K | 10k | input buffer feedback; read from the schematic by eye | |
| R6 | 10K | 10k | stage 1; read from the schematic by eye | |
| R7 | 10K | 10k | stage 1; read from the schematic by eye | |
| R8 | 10K | 10k | read from the schematic by eye | |
| R9 | 10K | 10k | read from the schematic by eye | |
| R10 | 470K | 470k | read from the schematic by eye | |
| R11 | 10K | 10k | stage 2; read from the schematic by eye | |
| R12 | 10K | 10k | stage 2; read from the schematic by eye | |
| R13 | 10K | 10k | read from the schematic by eye | |
| R14 | 10K | 10k | read from the schematic by eye | |
| R15 | 470K | 470k | read from the schematic by eye | |
| R16 | 1M | 1M | read from the schematic by eye | |
| R17 | 47K | 47k | read from the schematic by eye | |
| R18 | 47K | 47k | read from the schematic by eye | |
| R19 | 3.9M | 3.9M | read from the schematic by eye | |
| R20 | 150K | 150k | read from the schematic by eye | |
| R21 | 150K | 150k | from +9V; hard to read; read from the schematic by eye | |
| R22 | 150K | 150k | read from the schematic by eye | |
| R23 | 150K | 150k | read from the schematic by eye | |
| R24 | 8.2K | 8.2k | mod 4, two 8k2 in parallel; read from the schematic by eye | |
| R25 | 8.2K | 8.2k | mod 4, two 8k2 in parallel; read from the schematic by eye | |
| R26 | 2.4K | 2.4k | mod 2, LED; read from the schematic by eye | |
| R27 | 150K | 150k | output pulldown; read from the schematic by eye | |
| Capacitors 13 | ||||
| C1 | 10n | 10n | input, .01; read from the schematic by eye | |
| C2 | 10u | 10u | electrolytic; read from the schematic by eye | |
| C3 | 10u | 10u | electrolytic; read from the schematic by eye | |
| C4 | 47n | 47n | stage 1, .047; read from the schematic by eye | |
| C5 | 10n | 10n | stage 1, .01, switched alternative; read from the schematic by eye | |
| C6 | 10n | 10n | read from the schematic by eye | |
| C7 | 47n | 47n | stage 2, .047; read from the schematic by eye | |
| C8 | 100n | 100n | stage 2, .1, switched alternative; read from the schematic by eye | |
| C9 | 10n | 10n | read from the schematic by eye | |
| C10 | 47n | 47n | read from the schematic by eye | |
| C11 | 10n | 10n | .01; read from the schematic by eye | |
| C12 | 10u | 10u | electrolytic; read from the schematic by eye | |
| C13 | 47n | 47n | output, .047; read from the schematic by eye | |
| Diodes 1 | ||||
| D1 | 5.1V zener | 5V1 | bias reference; read from the schematic by eye | |
| Transistors 2 | ||||
| Q1 | 2N5458 | 2N5458 | matched with Q2; read from the schematic by eye | |
| Q2 | 2N5458 | 2N5458 | matched with Q1; read from the schematic by eye | |
| ICs 2 | ||||
| IC1 | NE5532 | NE5532 | read from the schematic by eye | |
| IC2 | NE5532 | NE5532 | read from the schematic by eye | |
| Potentiometers 3 | ||||
| Bias | 100K | 100k | Potentiometer | mod 3; read from the schematic by eye |
| Speed | 500K | 500k | Potentiometer | read from the schematic by eye |
| Mix | 22K | 22k | Potentiometer | mod 5; read from the schematic by eye |
| Switches 1 | ||||
| Cap switch | DPDT | DPDT | mod 1; read from the schematic by eye | |
| LEDs 1 | ||||
| LED1 | LED | LED | rate indicator; read from the schematic by eye | |
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