Akashic Guitar effects circuit lookup
FREQMID

125B · 2 knobs

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/

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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 37 rows

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RefValueNormalizedTypeNotes
Resistors 15
R1150k150k1/4 watt resistor 100k-1M Bigger increases input gain. Should be equal or greater than R2.
R2100k100k1/4 watt resistor 100k-470k Sets input impedance and gain, along with R1
R32.2M2.2M1/4 watt resistor 1M Pull down resistor
R4100k100k1/4 watt resistor
R51k1k1/4 watt resistor
R610k10k1/4 watt resistor
R710k10k1/4 watt resistor
R81M1M1/4 watt resistor
R9100R1001/4 watt resistor
R10100R1001/4 watt resistor
R114.7k4.7k1/4 watt resistor
R124.7k4.7k1/4 watt resistor
R131k1k1/4 watt resistor
R141k1k1/4 watt resistor
CLR4.7k4.7k1/4 watt resistor 1k-10k Current limiting resistor for LED.
Capacitors 10
C11u1uFilm cap
C20.1u100nFilm cap 22n-0.22u Input cap
C31u1uFilm cap
C41u1uFilm cap
C5100p100pCeramic cap
C60.22u220nFilm cap
C70.1u100nFilm cap
C80.1u100nFilm cap
C9100u100uElectrolytic cap
C10100u100uElectrolytic cap
Diodes 1
D11n58181N5818Schottky diode 1n5817, 1n4001, bat41 Any suitableprotection diode for 9v
ICs 2
IC1TL071PTL071POP AMP
IC2TL072TL072Dual OP AMP TLE2072, LM833, NE5532, etc Any pin-compatible dual op amp.
Potentiometers 2
FREQB10KB10k16mm dual pot
MIDB10KB10k16mm potentiometer
Switches 1
SPADPADSend to PCB
LEDs 3
LEDL1L13mm LED
L+PADPADLED+
L-PADPADLED-
Other 3
RPADPADReturn from PCB
VPADPAD9v in
GPADPADGround