125B · 4 knobs
From the vendor
Mid-boosted silicon fuzz
Face is a high gain, mid-boosted silicon fuzz inspired by the GCI SBD. It features a dual Jfet-based band-pass filter with switchable center frequencies and a fuzz section derived from the Vox Super Beatle Distortion.
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.
Build documentation can be found here below. Please read before purchasing.
Face Build Guide
For your convenience, a parts kit can be purchased here:
http://smallbear-electronics.mybigcommerce.com/kit-face-pcb-not-included/
Share your work, get tips, ask questions and help troubleshoot at our Facebook Group. Don't forget to agree to the group rules if you wish to join. GCI DIY PCB builders group
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 41 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| CLR | 4.7k | 4.7k | 1/4 watt resistor 1k-10k Current limit | ing resistor for LED |
| R1 | 3.3k | 3.3k | 1/4 watt resistor | |
| R2 | 10k | 10k | 1/4 watt resistor | |
| R3 | 10k | 10k | 1/4 watt resistor 1k-47k Sets maximum | output volume |
| R4 | 1k | 1k | 1/4 watt resistor 1k-33k Influences bi | as voltage |
| R5 | 4.7k | 4.7k | 1/4 watt resistor 10k-33k Influences bi | as voltage |
| R6 | 10k | 10k | 1/4 watt resistor 1k-47k Forms a LPF w | ith C8 |
| R7 | 2.2M | 2.2M | 1/4 watt resistor 1M Pull down res | istor |
| R8 | 33k | 33k | 1/4 watt resistor Affects gain | |
| R9 | 120k | 120k | 1/4 watt resistor | |
| R10 | 100R | 100 | 1/4 watt resistor Affects gain | |
| R11 | 10k | 10k | 1/4 watt resistor | |
| Capacitors 10 | ||||
| C1 | 47u | 47u | 6.3mm electrolytic cap 100u Power filter | cap |
| C2 | 470p | 470p | ceramic cap 100p-1n Affect amount | of LPF in Jfet stage |
| C3 | 47n | 47n | film cap | |
| C4 | 1u | 1u | film cap | |
| C5 | 0.22u | 220n | film cap 0.33u Lowers freque | ncy of switch position 1 |
| C6 | 0.22u | 220n | film cap 0.1u - 0.47u Affects frequ | encies of all switch positions |
| C7 | 1u | 1u | film cap | |
| C8 | 1n | 1n | film cap | |
| C9 | 220p | 220p | ceramic cap 100p-1n Affects amoun | t of LPF in BJT stage |
| C10 | 22u | 22u | 5mm electrolytic cap 2.2u - 47u Affects gain | and tone of BJT stage. Increase for more gain. |
| Diodes 1 | ||||
| D1 | 1n5817 | 1N5817 | Schottky diode 1n5818, 1n4001, Bat41, etc Any suitable | protection diode for 9v supply |
| Transistors 4 | ||||
| Q1 | PF5102 | PF5102 | N-channel JFET J201, MPF102, 2n5457, etc Double check | pinout |
| Q2 | PF5102 | PF5102 | N-channel JFET J201, MPF102, 2n5457, etc Double check | pinout |
| Q3 | BC338 | BC338 | NPN Transistor 2n5088, 2n4401, 2n2222a, etc Medium to hig | h gain BJT. Double check pinout. |
| Q4 | BC338 | BC338 | NPN Transistor 2n5088, 2n4401, 2n2222a, etc Medium to hig | h gain BJT. Double check pinout. |
| Inductors 1 | ||||
| L | 100MH | 100mH | Abracon AISR-01-104J Bournes, Murata Inductors wit | h DCR less than 100 ohms are best |
| Potentiometers 3 | ||||
| LEVEL | A50k | A50k | 16mm pot | |
| MID | C10K | C10k | 16mm pot | |
| FUZZ | C1K | C1k | 16mm pot | |
| Trimmers 2 | ||||
| Q1BIAS | 25k | 25k | trim pot 50k Transistor su | bstitutions may require bigger trim pot |
| Q3BIAS | 25k | 25k | trim pot 50k Transistor su | bstitutions may require bigger trim pot |
| Switches 2 | ||||
| FREQ | SPDT on/off/on | SPDT ON/OFF/ON | switch on/on, rotary, or bypass Affects frequ | ency of mid boost |
| 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 | |