splashsky Posted February 6, 2007 Report Share Posted February 6, 2007 i built a preamp equa circuit for a bass guitar the specs and circuit is shown belowI had some problems in the begin with clipping and all...!and its goodbut there is a hiss sound (earth problems) when i touch the ground the hiss is no morebut no one plays the guitar with bare foot... (at least on a stage)can some one tell me how to solve it... is there's any way like artifical earth...! ::)http://redcircuits.com/Page69.htmspec:P1,P2_________100K Linear PotentiometersP3____________470K Linear PotentiometerP4_____________10K Log. PotentiometerR1____________150K 1/4W ResistorR2____________220K 1/4W ResistorR3_____________56K 1/4W ResistorR4____________470K 1/4W ResistorR5,R6,R7_______12K 1/4W ResistorsR8,R9___________3K9 1/4W ResistorsR10,R11_________1K8 1/4W ResistorsR12,R13________22K 1/4W ResistorsC1____________220nF 63V Polyester CapacitorC2,C8___________4µ7 63V Electrolytic CapacitorsC3_____________47nF 63V Polyester CapacitorC4,C6___________4n7 63V Polyester CapacitorsC5_____________22nF 63V Polyester CapacitorC7,C9_________100µF 25V Electrolytic CapacitorsIC1___________TL062 Low current BIFET Dual Op-AmpJ1,J2__________6.3mm. Mono Jack socketsSW1______________1 pole 3 ways rotary or slider switchSW2______________SPST SwitchB1_______________9V PP3 Battery Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 6, 2007 Report Share Posted February 6, 2007 Did you use shielded audio cable from the guitar to the preamp circuit and from the preamp to the amplifier?Is the preamp in a metal box that is connected to the signal ground?Is the amplifier connected to earth?Does the hiss sound change volume when the output volume control on the preamp is adjusted? Quote Link to comment Share on other sites More sharing options...
splashsky Posted February 8, 2007 Author Report Share Posted February 8, 2007 Did you use shielded audio cable from the guitar to the preamp circuit and from the preamp to the amplifier?yes its a good oneIs the preamp in a metal box that is connected to the signal ground?No, Its on my guitar onboardIs the amplifier connected to earth?Yes, because on the other guitars the hiss sound is not there when i Touch it..(with my shoes on)but in this guitar the sound reduces (with my shoes) and there's nothing when i touch the ground with my bare footDoes the hiss sound change volume when the output volume control on the preamp is adjusted?no, Not much... Quote Link to comment Share on other sites More sharing options...
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