1590BBM · 5 knobs
From the vendor
DS-1 with HM-2 EQ
Inspired by the pedal stacking of early Swedish death metal pioneers, the GCI HM-1 combines the distortion and tone stack of a DS-1 with a boost-only version of the HM-2 tone stack.
Build documentation can be found here below. Please read before purchasing.
HM-1 Build Guide
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.
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 78 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 31 | ||||
| CLR | 4.7k | 4.7k | 1/4 watt resistor | |
| R1 | 4.7k | 4.7k | 1/4 watt resistor | |
| R2 | 47k | 47k | 1/4 watt resistor | |
| R3 | 100k | 100k | 1/4 watt resistor | |
| R4 | 2.2M | 2.2M | 1/4 watt resistor 1M-10M input pull do | wn resistor |
| R5 | 1k | 1k | 1/4 watt resistor | |
| R6 | 470k | 470k | 1/4 watt resistor 270k-1M affects input | HPF along with C5 |
| R7 | 10k | 10k | 1/4 watt resistor | |
| R8 | 10k | 10k | 1/4 watt resistor | |
| R9 | 470k | 470k | 1/4 watt resistor | |
| R10 | 100k | 100k | 1/4 watt resistor | |
| R11 | 22R | 22 | 1/4 watt resistor | |
| R12 | 2.2k | 2.2k | 1/4 watt resistor | |
| R13 | 1.2k | 1.2k | 1/4 watt resistor 1k-2.2k affects HPF of gain stage along | with C8 |
| R14 | 3.3k | 3.3k | 1/4 watt resistor | |
| R15 | 100k | 100k | 1/4 watt resistor | |
| R16 | 330R | 330 | 1/4 watt resistor | |
| R17 | 82k | 82k | 1/4 watt resistor | |
| R18 | 100k | 100k | 1/4 watt resistor | |
| R19 | 100R | 100 | 1/4 watt resistor | |
| R20 | 100k | 100k | 1/4 watt resistor | |
| R21 | 330R | 330 | 1/4 watt resistor | |
| R22 | 2.2k | 2.2k | 1/4 watt resistor | |
| R23 | 6.8k | 6.8k | 1/4 watt resistor | |
| R24 | 6.8k | 6.8k | 1/4 watt resistor | |
| R25 | 10k | 10k | 1/4 watt resistor | |
| R26 | 10k | 10k | 1/4 watt resistor | |
| R27 | 5.1k | 5.1k | 1/4 watt resistor | |
| R28 | 330R | 330 | 1/4 watt resistor | |
| R29 | 3.3k | 3.3k | 1/4 watt resistor | |
| R30 | 5.1k | 5.1k | 1/4 watt resistor | |
| Capacitors 22 | ||||
| C1 | 270p | 270p | MLCC | |
| C2 | 0.1u | 100n | MLCC | |
| C3 | 100u | 100u | electrolytic cap | |
| C4 | 0.1u | 100n | film cap | |
| C5 | 47n | 47n | film cap 10n-100n affects input | HPF along with R6 |
| C6 | 0.1u | 100n | film cap | |
| C7 | 270p | 270p | MLCC 100p-470p affects high | freq of first stage f gain stage along with |
| C8 | 0.22u | 220n | film cap 0.1u-0.47u R13 | |
| C9 | 0.47u | 470n | film cap | |
| C10 | 1n | 1n | film cap | |
| C12 | 100u | 100u | electrolytic cap | |
| C13 | 68n | 68n | film cap | |
| C14 | 6.8n | 6.8n | film cap | |
| C15 | 1u | 1u | film cap | |
| C16 | 4.7n | 4.7n | film cap | |
| C17 | 0.15u | 150n | film cap | |
| C18 | 0.1u | 100n | film cap | |
| C19 | 33n | 33n | film cap | |
| C20 | 0.1u | 100n | film cap | |
| C21 | 1u | 1u | film cap | |
| C22 | 1.5u | 1.5u | film cap | |
| C23 | 470p | 470p | MLCC | |
| Diodes 6 | ||||
| D1 | 1n4148 | 1N4148 | small signal diode 1n456a, 1n914, 1n5818, mosfet clipping diod | e |
| D2 | 1n4148 | 1N4148 | small signal diode 1n456a, 1n914, 1n5818, mosfet clipping diod | e |
| D3 | 1n4148 | 1N4148 | small signal diode 1n456a, 1n914, 1n5818, mosfet clipping diod | e |
| D4 | bat41 | BAT41 | small signal diode 1n456a, 1n914, 1n5818, mosfet clipping diod | e |
| D5 | bat41 | BAT41 | small signal diode 1n456a, 1n914, 1n5818, mosfet clipping diod | e |
| D6 | 1n5818 | 1N5818 | schottky diode 1n5817, 1n4001 reverse polar | ity protection |
| Transistors 2 | ||||
| Q1 | 2N5088 | 2N5088 | NPN BJT 2n3904, 2n4401, BC550 check pinouts | (BC550 is backwards) |
| Q2 | 2N5088 | 2N5088 | NPN BJT 2n3904, 2n4401, BC550 check pinouts | (BC550 is backwards) |
| ICs 3 | ||||
| IC1 | RC4558 | RC4558 | dual op amp TL072, MC1458 | |
| IC2 | TL072 | TL072 | dual op amp TLC2272, NE5532 | |
| IC3 | TL074 | TL074 | quad op amp TLC2274, LMC6484 | |
| Potentiometers 5 | ||||
| DIST | B500k | B500k | 16mm potentiometer B250k-B1M gain | |
| SHAPE | B25k | B25k | 16mm potentiometer | |
| HI | C5k | C5k | 16mm potentiometer B5k taper will stink, but it will wo | rk |
| LOW | B5k | B5k | 16mm potentiometer | |
| LEVEL | A50k | A50k | 16mm potentiometer A100k | |
| Switches 1 | ||||
| S | Send to PCB | SEND TO PCB | PAD | |
| LEDs 3 | ||||
| LED | L1 | L1 | 3mm LED | |
| L+ | LED+ | LED+ | PAD | |
| L- | LED- | LED- | PAD | |
| Other 5 | ||||
| R | Return from PCB | RETURN FROM PCB | PAD | |
| V | 9v input | 9V INPUT | PAD | |
| G | Ground | GROUND | PAD | |
| G1 | Ground | GROUND | PAD | |
| G2 | Ground | GROUND | PAD | |
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