Akashic Guitar effects circuit lookup
VOLUMEGAINHIGHLOW

125B · 4 knobs

From the vendor

Overdrive

Hannibal is an overdrive pedal derived from the GCI Riffchild. Experienced builders will recognize the topology as a negative feedback op amp clipper — arguably the most common type of circuit used in overdrive pedals. Despite being fairly common, it’s an excellent sounding and highly customizable circuit. This PCB is an easy build with minimum components, yet it still offers the builder enough flexibility to tailor the tone to their own tastes.

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.

Hannibal Build Guide

For your convenience, a parts kit can be purchased here:

http://smallbear-electronics.mybigcommerce.com/kit-hannibal-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 39 rows

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RefValueNormalizedTypeNotes
Resistors 13
CLR4.7k4.7k1/4 watt resistor 1k-10k current limiting resistor for LED
R1100k100k1/4 watt resistor
R210k10k1/4 watt resistor
R310k10k1/4 watt resistor
R41M1M1/4 watt resistor 2.2M pull down resistor
R51k1k1/4 watt resistor
R61M1M1/4 watt resistor
R71k1k1/4 watt resistor 100R-10k forms HPF with C5 and Low pot
R81k1k1/4 watt resistor 1k-47k sets minimumgain
R922k22k1/4 watt resistor
R10470k470k1/4 watt resistor 100k-1M sets gain ofsecond op amp stage
R1147k47k1/4 watt resistor 10k-100k sets gain ofsecond op amp stage and forms HPF with C6
R121K1k1/4 watt resistor 1k--10k sets maximumoutput volume
Capacitors 10
C122n22nfilm cap
C2100u100uelectrolytic cap 47u-220u power filtercap
C347n47nfilm cap 10n-100n input cap
C40.1u100nceramic cap
C50.1u100nfilm cap 47n-330n forms a HPF with R7 and Low pot
C60.1u100nfilm cap 47n-330n forms a HPF with R11
C7100u100uelectrolytic cap 47u-220u power filtercap
C8100p100pceramic cap 47p-1n LPF for firstgain stage
C9100p100pceramic cap 47p-1n LPF for second gain stage
C101uF1ufilm cap
Diodes 4
D11n41481N4148Si diode 1n456a, 1n34a, LED, zener, etc clipping diodes
D21n41481N4148Si diode 1n456a, 1n34a, LED, zener, etc clipping diodes
D31n41481N4148Si diode 1n456a, 1n34a, LED, zener, etc clipping diodes
D41n58181N5818Schottky diode 1n5817, 1n4001, bat41, etc any suitablepolarity protection diode for 9v
ICs 1
ICLM833LM833OP AMP TL072, MC1458, RC4558, etc any pin compatible op amp. Install an IC socket for easy swaps
Potentiometers 4
VOLUMEA100KA100k16mm pot A50k
GAINA100KA100k16mm pot A50k-A250k sets gain offirst op amp stage
HIGHA100KA100k16mm pot
LOWB10KB10k16mm pot
Switches 1
SPADPADsend to PCB
LEDs 3
LEDL1L1LED
L+PADPADLED+
L-PADPADLED-
Other 3
RPADPADreturn from
VPADPAD9V input
GPADPADground