GCI Hannibal Build Manual

GOD C ITY I NSTRUMENTS – H annibal V 1.3 B uild g uide
The G od C ity I nstruments ( GCI) H annibal i s a n o verdrive p edal d erived f rom t he G CI R iffchild. E xperienced
builders w ill r ecognize t he t opology a s a n egative f eedback o p a mp c lipper, a rguably t he m ost c ommon t ype o f
circuit u sed i n o verdrive p edals. D espite b eing f airly c ommon, i t's a s imple, e xcellent s ounding, h ighly
customizable c ircuit. T his P CB h as b een d esigned t o b e a n e asy b uild w ith m inimum c omponents, y et s till o ffer
the b uilder e nough f lexibility t o t ailor t he t one t o t heir o wn t astes.
Regarding t he " Low" k nob, t his p ot c ontrols h ow m uch b ass i s a llowed i nto t he o verdrive s ection, b ut i t a lso
has a n i nfluence o n g ain. A s m ore b ass i s a llowed i nto t he c ircuit, t he a mount o f g ain i s r educed. I f t his i s
undesirable, j umper p ins 1 a nd 2 o f t he l ow p ot, o mit t he p ot, a nd a djust R 7 a nd C 5 f or d esired b ass a nd g ain
response. 1 .2k a nd 0 .22u i s a g ood p lace t o s tart. C 5 c ould e ven b e r eplaced w ith a D PDT o n/on/on f or 3 c ap
values.
If a c lipping d iode s witch i s d esired, o mit D 2 a nd D 3 a nd r un w ires f rom t he D 1 p osition t o a s witch f or o ff-­‐
board c lipping d iode o ptions.
This p edal i s a n e asy b uild, b ut t his g uide i s i ntended f or p eople w ho h ave s ome e xperience b uilding p edals.
Component s ourcing, c omponent i dentification, a ssembly t echniques, w iring s tomp s witches, e tc. i s n ot
covered. T he G CI B rutalist J r. a ssembly g uide h as h elpful i nformation f or l ess e xperienced b uilders. T hat g uide
can b e f ound h ere:
http://www.kurtballou.com/brutalistjr/
For y our c onvenience, c omplete p arts k its i ncluding e verything y ou n eed e xcept t he P CB c an b e p urchased
through S mall B ear E lectronics. B e w ary t hat t hey m ay n eed t o m ake s ubstitutions f or w ork-­‐alike c omponents
which m ay o r m ay n ot i nfluence t he t one o f t he p edal. B e a ware t hat t ransistors m ay h ave b een s ubstituted
for w ork-­‐alikes w ith d ifferent p inouts.
http://smallbear-­‐electronics.mybigcommerce.com/kit-­‐hannibal-­‐pcb-­‐not-­‐included/
Available s eparately i s t he G CI 3 PDT u tility P CB f or P CB p in 3 PDT f ootswitches. T his P CB m akes f ootswitch
wiring q uick a nd e asy. N ot c ompatible w ith s older l ug s tyle s witches.
Don't f orget t o c onnect t he g round p ad o f t he P CB t o t he g round l ug o f t he i nput, o utput, a nd D C p ower j acks!
Due t o t he s cope o f t his p roject, t echnical s upport i s n ot a vailable. H owever, c onsider j oining t he G CI D IY P CB
Builders g roup o n F acebook t o g et a dvice f rom a nd s hare y our w ork w ith o ther b uilders. W e r equire t hat a ll
group m embers a gree t o t he r ules b efore b eing a ccepted i nto t he g roup.
https://www.facebook.com/groups/2454786551255317/
Component v alues f or t he P CB a s w ell a s s ome a lternate v alues a re l isted b elow. T his i s a B OM f or t he P CB
only. R esistors a nd d iodes a re 6 .3mm l eg s pacing, f ilm a nd c eramic c apacitors a re 5 .08mm l eg s pacing, a nd
electrolytic c apacitors a re 2 .54mm l eg s pacing. I /O j acks, D C j ack, s witch, e nclosure, a nd k nobs a re n ot l isted.
The s chematic a nd a d rill t emplate f or a 1 25B ( 1590N1) s ized e nclosure a re a lso a ttached.
God C ity I nstruments – H annibal V 1.3 B uild G uide
1