Enclosure not stated · 6 knobs
Blackstone Appliances Mosfet Overdrive
Based on the Blackstone Appliances MOSFET Overdrive· 2 other boards clone it
- Category
- Overdrive
- Controls
- Red Level · Red Drive · Blue Level · Blue Drive · Mid Cut · Mode
- Price
- see vendor
From the vendor
A two-channel overdrive: an MPF102 JFET and TL072 op-amp front end feeding CD4049UBE CMOS inverter gain stages (each inverter is a pair of MOSFETs), with separate drive and level controls for the red and brown/blue channels and a mid cut. The post says it sounds tube-like and very responsive, a change from the Tube Screamer.
VR6 (500K trim) sets stage 2 treble and VR7 (500K trim) stage 2 gain. C11 and the PCL 330p cap are socketed for experimenting.
Schematic
The schematic is in the post. Open it at Revolution Deux. 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 schematic was not sure of
- The post's only drawing is RipDivot's vero layout; the schematic itself is an off-site download. Parts are taken from the layout's parts list.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 20 | ||||
| R1 | 8.2K | 8.2k | off board; read from the schematic by eye | |
| R2 | 2.2K | 2.2k | read from the schematic by eye | |
| R3 | 39K | 39k | read from the schematic by eye | |
| R4 | 1M | 1M | read from the schematic by eye | |
| R5 | 390K | 390k | read from the schematic by eye | |
| R6 | 33K | 33k | read from the schematic by eye | |
| R7 | 33K | 33k | read from the schematic by eye | |
| R8 | 39K | 39k | read from the schematic by eye | |
| R9 | 12K | 12k | read from the schematic by eye | |
| R10 | 22K | 22k | read from the schematic by eye | |
| R11 | 3.3K | 3.3k | off board; read from the schematic by eye | |
| R12 | 2.2M | 2.2M | read from the schematic by eye | |
| R13 | 390K | 390k | read from the schematic by eye | |
| R14 | 220K | 220k | read from the schematic by eye | |
| R15 | 220K | 220k | read from the schematic by eye | |
| R16 | 220K | 220k | read from the schematic by eye | |
| R17 | 750K | 750k | read from the schematic by eye | |
| R18 | 120 | 120 | read from the schematic by eye | |
| R19 | 100K | 100k | read from the schematic by eye | |
| R20 | 390K | 390k | read from the schematic by eye | |
| Capacitors 14 | ||||
| C1 | 220p | 220p | read from the schematic by eye | |
| C2 | 33n | 33n | read from the schematic by eye | |
| C3 | 56n | 56n | read from the schematic by eye | |
| C4 | 1.5n | 1.5n | read from the schematic by eye | |
| C5 | 150n | 150n | read from the schematic by eye | |
| C6 | 56n | 56n | read from the schematic by eye | |
| C7 | 1.5n | 1.5n | read from the schematic by eye | |
| C8 | 33n | 33n | read from the schematic by eye | |
| C9 | 3.3n | 3.3n | read from the schematic by eye | |
| C10 | 3.3n | 3.3n | read from the schematic by eye | |
| C11 | 10n | 10n | socketed; read from the schematic by eye | |
| PCL | 330p | 330p | socketed; read from the schematic by eye | |
| CP1 | 4.7u | 4.7u | electrolytic; read from the schematic by eye | |
| CP2 | 100u | 100u | electrolytic; read from the schematic by eye | |
| Diodes 1 | ||||
| D1 | 1N4001 | 1N4001 | read from the schematic by eye | |
| Transistors 1 | ||||
| Q1 | MPF102 | MPF102 | read from the schematic by eye | |
| ICs 2 | ||||
| IC1 | TL072 | TL072 | read from the schematic by eye | |
| IC2 | CD4049UBE | CD4049UBE | read from the schematic by eye | |
| Potentiometers 7 | ||||
| Blue Level | B50K | B50k | Potentiometer | VR1; read from the schematic by eye |
| Red Drive | B500K | B500k | Potentiometer | VR2; read from the schematic by eye |
| Red Level | B50K | B50k | Potentiometer | VR3; read from the schematic by eye |
| Mid Cut | B50K | B50k | Potentiometer | VR4; read from the schematic by eye |
| Blue Drive | B500K | B500k | Potentiometer | VR5; read from the schematic by eye |
| Stage 2 treble trim | 500K | 500k | Potentiometer | VR6, trimmer; read from the schematic by eye |
| Stage 2 gain trim | 500K | 500k | Potentiometer | VR7, trimmer; read from the schematic by eye |
| Switches 1 | ||||
| Mode | SPDT | SPDT | SW3; read from the schematic by eye | |
| LEDs 2 | ||||
| LED1 | red/blue LED | RED/BLUE LED | channel; read from the schematic by eye | |
| LED2 | violet LED | VIOLET LED | bypass; read from the schematic by eye | |
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