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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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 13 | ||||
| CLR | 4.7k | 4.7k | 1/4 watt resistor 1k-10k current limit | ing resistor for LED |
| R1 | 100k | 100k | 1/4 watt resistor | |
| R2 | 10k | 10k | 1/4 watt resistor | |
| R3 | 10k | 10k | 1/4 watt resistor | |
| R4 | 1M | 1M | 1/4 watt resistor 2.2M pull down res | istor |
| R5 | 1k | 1k | 1/4 watt resistor | |
| R6 | 1M | 1M | 1/4 watt resistor | |
| R7 | 1k | 1k | 1/4 watt resistor 100R-10k forms HPF wit | h C5 and Low pot |
| R8 | 1k | 1k | 1/4 watt resistor 1k-47k sets minimum | gain |
| R9 | 22k | 22k | 1/4 watt resistor | |
| R10 | 470k | 470k | 1/4 watt resistor 100k-1M sets gain of | second op amp stage |
| R11 | 47k | 47k | 1/4 watt resistor 10k-100k sets gain of | second op amp stage and forms HPF with C6 |
| R12 | 1K | 1k | 1/4 watt resistor 1k--10k sets maximum | output volume |
| Capacitors 10 | ||||
| C1 | 22n | 22n | film cap | |
| C2 | 100u | 100u | electrolytic cap 47u-220u power filter | cap |
| C3 | 47n | 47n | film cap 10n-100n input cap | |
| C4 | 0.1u | 100n | ceramic cap | |
| C5 | 0.1u | 100n | film cap 47n-330n forms a HPF w | ith R7 and Low pot |
| C6 | 0.1u | 100n | film cap 47n-330n forms a HPF w | ith R11 |
| C7 | 100u | 100u | electrolytic cap 47u-220u power filter | cap |
| C8 | 100p | 100p | ceramic cap 47p-1n LPF for first | gain stage |
| C9 | 100p | 100p | ceramic cap 47p-1n LPF for secon | d gain stage |
| C10 | 1uF | 1u | film cap | |
| Diodes 4 | ||||
| D1 | 1n4148 | 1N4148 | Si diode 1n456a, 1n34a, LED, zener, etc clipping diod | es |
| D2 | 1n4148 | 1N4148 | Si diode 1n456a, 1n34a, LED, zener, etc clipping diod | es |
| D3 | 1n4148 | 1N4148 | Si diode 1n456a, 1n34a, LED, zener, etc clipping diod | es |
| D4 | 1n5818 | 1N5818 | Schottky diode 1n5817, 1n4001, bat41, etc any suitable | polarity protection diode for 9v |
| ICs 1 | ||||
| IC | LM833 | LM833 | OP AMP TL072, MC1458, RC4558, etc any pin compa | tible op amp. Install an IC socket for easy swaps |
| Potentiometers 4 | ||||
| VOLUME | A100K | A100k | 16mm pot A50k | |
| GAIN | A100K | A100k | 16mm pot A50k-A250k sets gain of | first op amp stage |
| HIGH | A100K | A100k | 16mm pot | |
| LOW | B10K | B10k | 16mm pot | |
| Switches 1 | ||||
| S | PAD | PAD | send to PCB | |
| LEDs 3 | ||||
| LED | L1 | L1 | LED | |
| L+ | PAD | PAD | LED+ | |
| L- | PAD | PAD | LED- | |
| Other 3 | ||||
| R | PAD | PAD | return from | |
| V | PAD | PAD | 9V input | |
| G | PAD | PAD | ground | |