125B · 4 knobs
From the vendor
18v distortion/boost circuit
Gorilla Glasses is a DIY-friendly interpretation of the GCI Ape Eye high voltage distortion/boost circuit. It uses a charge pump to internally add a -9V rail to the standard incoming +9VDC supply for a total swing of 18 volts. The sound is classy and transparent and features the typical gain, volume and tone controls as well as a unique "clipping" control. Turn this to adust between "boost" and "distortion." Increasing this control lowers volume and increases clipping. Bassists, in particular will love this feature.
Sale is for PCB only. You must source the components and build the pedal yourself. To make foot switch wiring easier, we also suggest you buy the 3pdt utility switch.
Gorilla Glasses Build Guide
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NOT FOR COMMERCIAL USE
Schematic
The schematic is in the vendor's build document. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 53 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 14 | ||||
| CLR | 4.7k | 4.7k | 1/4 watt resistor 1k-10k | Affects LED brightness |
| R1 | 1M | 1M | 1/4 watt resistor | |
| R2 | 6.8k | 6.8k | 1/4 watt resistor | |
| R3 | 2.2M | 2.2M | 1/4 watt resistor | |
| R4 | 100R | 100 | 1/4 watt resistor | |
| R5 | 1k | 1k | 1/4 watt resistor | |
| R6 | 100k | 100k | 1/4 watt resistor | |
| R7 | 1M | 1M | 1/4 watt resistor | |
| R8 | 4.7k | 4.7k | 1/4 watt resistor | |
| R9 | 470R | 470 | 1/4 watt carbon resistor Metal | Carbon is more resilient to power supply issues |
| R10 | 1.8k | 1.8k | 1/4 watt resistor 1k-2.7k | Smaller increases gain and tightness. |
| R11 | 10R | 10 | 1/4 watt carbon resistor Metal | Carbon is more resilient to power supply issues |
| R12 | 10R | 10 | 1/4 watt carbon resistor Metal | Carbon is more resilient to power supply issues |
| R13 | 4.7k | 4.7k | 1/4 watt resistor | |
| Capacitors 18 | ||||
| C1 | 2.2n | 2.2n | film capacitor | |
| C2 | 10n | 10n | electrolytic capacitor 4.7n-22n | Input high pass |
| C3 | 10u | 10u | film capacitor 4.7u-22u | Affects Jfet gain |
| C4 | 22n | 22n | film capacitor 10n-0.1u | Interstage HPF |
| C5 | 0.1u | 100n | MLCC | |
| C6 | 100u | 100u | electrolytic capacitor | |
| C7 | 0.15u | 150n | film capacitor 0.1u-0.22 u | Affects tightness of bottom end. Bigger is looser. |
| C8 | 150p | 150p | MLCC 100p-470p, Polystyrene | Drive circuit low pass filter. Bigger is warmer. |
| C9 | 30p | 30p | MLCC 33p, none | Required for externally compensated op amps |
| C10 | 0.1u | 100n | MLCC | |
| C11 | 1u | 1u | MLCC | |
| C12 | 0.1u | 100n | MLCC | |
| C13 | 100u | 100u | electrolytic capacitor 47u-220u | Power filtering |
| C14 | 1u | 1u | film capacitor 0.47u-4.7u | Coupling cap |
| C15 | 1u | 1u | film capacitor 0.47u-4.7u | Coupling cap |
| C16 | 1u | 1u | MLCC | |
| C17 | 1u | 1u | MLCC | |
| C18 | 3.9n | 3.9n | film capacitor 2.7n-4.7n | Affects range of tone control |
| Diodes 6 | ||||
| D1 | 1n5818 | 1N5818 | Schottky Diode | |
| D2 | 1n5818 | 1N5818 | Schottky Diode | |
| D3 | RED | RED | 3mm LED Yellow, Green | Affects clipping symmetry |
| D4 | 1n5818 | 1N5818 | Schottky Diode | |
| D5 | 1n5818 | 1N5818 | Schottky Diode | |
| D6 | 1N5818 | 1N5818 | Schottky Diode | |
| Transistors 1 | ||||
| Q1 | J201 | J201 | Jfet J113, MPF5102, 2n5857 Pin co | mpatible Jfet |
| ICs 2 | ||||
| IC1 | LM741 | LM741 | Op Amp TL071, NE5534, LF356 | Pin compatible single op amp capable of 18v supply |
| IC2 | TC7660H | TC7660H | Charge Pump TC7660SPCA Adjust | power supply caps accordingly |
| Potentiometers 4 | ||||
| VOL | A100k | A100k | 16mm Pot A50k | |
| GAIN | A250k | A250k | 16mm Pot | |
| CLIP | A5k | A5k | 16mm Pot | |
| TONE | B100k | B100k | 16mm Pot B25k, B50k Affect | s range of tone control |
| Trimmers 1 | ||||
| Q_BIAS | 25k | 25k | Trim Pot 20k-100k Affect | s bias range |
| Switches 1 | ||||
| S | PAD | PAD | Send to PCB | |
| LEDs 3 | ||||
| LED | L1 | L1 | 3mm LED | |
| L+ | PAD | PAD | LED+ | |
| L- | PAD | PAD | LED- | |
| Other 3 | ||||
| R | PAD | PAD | Return from PCB | |
| V | PAD | PAD | 9V input | |
| G | PAD | PAD | Ground | |