125B · 2 knobs
Stockwell
- Category
- EQ / Filter
- Price
- $10.00in stock
From the vendor
Active sweepable mid-range EQ
Stockwell is an active mid-range EQ which provides approximately 15db of boost or cut sweepable between 200 Hz and 8 kHz. Use it before a dirt circuit to affect its timbre, clarity, and harmonic content or after a dirt circuit to provide a wide range of equalization possibilities with just two simple controls. It can be built as a stand-alone pedal or used as a mod to add EQ control to another circuit.
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.
Stockwell Build Guide
For your convenience, a parts kit can be purchased here:
http://smallbear-electronics.mybigcommerce.com/kit-stockwell-v1-1-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 37 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 15 | ||||
| R1 | 150k | 150k | 1/4 watt resistor 100k-1M Bigger increa | ses input gain. Should be equal or greater than R2. |
| R2 | 100k | 100k | 1/4 watt resistor 100k-470k Sets input im | pedance and gain, along with R1 |
| R3 | 2.2M | 2.2M | 1/4 watt resistor 1M Pull down res | istor |
| R4 | 100k | 100k | 1/4 watt resistor | |
| R5 | 1k | 1k | 1/4 watt resistor | |
| R6 | 10k | 10k | 1/4 watt resistor | |
| R7 | 10k | 10k | 1/4 watt resistor | |
| R8 | 1M | 1M | 1/4 watt resistor | |
| R9 | 100R | 100 | 1/4 watt resistor | |
| R10 | 100R | 100 | 1/4 watt resistor | |
| R11 | 4.7k | 4.7k | 1/4 watt resistor | |
| R12 | 4.7k | 4.7k | 1/4 watt resistor | |
| R13 | 1k | 1k | 1/4 watt resistor | |
| R14 | 1k | 1k | 1/4 watt resistor | |
| CLR | 4.7k | 4.7k | 1/4 watt resistor 1k-10k Current limit | ing resistor for LED. |
| Capacitors 10 | ||||
| C1 | 1u | 1u | Film cap | |
| C2 | 0.1u | 100n | Film cap 22n-0.22u Input cap | |
| C3 | 1u | 1u | Film cap | |
| C4 | 1u | 1u | Film cap | |
| C5 | 100p | 100p | Ceramic cap | |
| C6 | 0.22u | 220n | Film cap | |
| C7 | 0.1u | 100n | Film cap | |
| C8 | 0.1u | 100n | Film cap | |
| C9 | 100u | 100u | Electrolytic cap | |
| C10 | 100u | 100u | Electrolytic cap | |
| Diodes 1 | ||||
| D1 | 1n5818 | 1N5818 | Schottky diode 1n5817, 1n4001, bat41 Any suitable | protection diode for 9v |
| ICs 2 | ||||
| IC1 | TL071P | TL071P | OP AMP | |
| IC2 | TL072 | TL072 | Dual OP AMP TLE2072, LM833, NE5532, etc Any pin-compa | tible dual op amp. |
| Potentiometers 2 | ||||
| FREQ | B10K | B10k | 16mm dual pot | |
| MID | B10K | B10k | 16mm potentiometer | |
| 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 in | |
| G | PAD | PAD | Ground | |