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splashsky
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Posts posted by splashsky
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i built a preamp equa circuit for a bass guitar the specs and circuit is shown below
I had some problems in the begin with clipping and all...!and its good
but there is a hiss sound (earth problems) when i touch the ground the hiss is no more
but 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.htm
spec:
P1,P2_________100K Linear Potentiometers
P3____________470K Linear Potentiometer
P4_____________10K Log. Potentiometer
R1____________150K 1/4W Resistor
R2____________220K 1/4W Resistor
R3_____________56K 1/4W Resistor
R4____________470K 1/4W Resistor
R5,R6,R7_______12K 1/4W Resistors
R8,R9___________3K9 1/4W Resistors
R10,R11_________1K8 1/4W Resistors
R12,R13________22K 1/4W Resistors
C1____________220nF 63V Polyester Capacitor
C2,C8___________4µ7 63V Electrolytic Capacitors
C3_____________47nF 63V Polyester Capacitor
C4,C6___________4n7 63V Polyester Capacitors
C5_____________22nF 63V Polyester Capacitor
C7,C9_________100µF 25V Electrolytic Capacitors
IC1___________TL062 Low current BIFET Dual Op-Amp
J1,J2__________6.3mm. Mono Jack sockets
SW1______________1 pole 3 ways rotary or slider switch
SW2______________SPST Switch
B1_______________9V PP3 Battery -
I've got the Chips from Texas instruments www.ti.com
any site for led's and POT's -
I agree to you....!
But the pot what i get here near my place are not of good quality...
Is there is any part..cular site for the same... -
Is there is any free sample site for switches and Potentiometer (esp..ly
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Almost all the problem was solved Thanks
but only the hum is there in the End, like when i turn off the battery.
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If the crackling problem is caused by the inputs of the TL062 opamps being overloaded then playing the guitar softly, using an 18V supply for them or using the other opamps I have listed will fix it.
The 22k resistors charge the 100uF capacitor in 1.1 seconds which should be quick enough. Does the crackling in the beginning last for longer than only 1.1 seconds after the battery is turned on?
yes its more than 1.1 like for some times its like for the whole time the battery is on..
What is this circuit driving? Its load should be 10k ohms or higher or the volume control will be burnt and the opamp will overheat.
the opamp did not heat up...
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can i Try lesser value for (22 k resistor ) ? and the capacitor like 50uF?
The 22k resistors charge the 100uF cap in only 1.1 seconds after the battery is turned on. Lesser values will be quicker but it is quick enough now. If the values are 10 times higher then there will be crackling at the beginning for 11 seconds.
Is there crackling if you play softly? -
Hi Splashsky,
welcome to our forum. ;D
Try the project with two 9V batteries in series making an 18V supply.
I would use an MC33172 or MC34072 dual opamp that won't cause this problem. You could try using older dual opamps like an MC1458 or an LM358 dual opamp. But these opamps use a higher battery current than the TL062 dual opamp in the project.
Thanks
If i subtitute the MC1458, or LM358 -
If R12 and R13 are 220k instead of 22k then they would cause C7 to charge very slowly and cause distortion at the beginning and when the battery is turned off. Or if C7 is 1000uF instead of 100uF.
I Checked these value using multimeter it was OK... can i Try lesser value for (22 k resistor ) ? and the capacitor like 50uF.
The TL072 might have the same overload problem as the existing TL062 but the MC1458 and LM358 won't. The MC1458 and LM358 have the same pins numbers as the existing TL062 so try one. They will work without changing the circuit.
Will try the the other IC's -
Thanks for your prompt reply ...
Cracking, or breaking of sound and I checked for the battery (its brand new one) -
I Built the circuit for Guitar Control (http://redcircuits.com/Page69.htm)
i Wanna use it for my Bass Guitar.
and it works fine... but there lots of clipping...(the breaking and cracking noise) mostly in the beginning... I checked all the connections and all the POT's but still the Clipping occurs....
and when i turn it off there's a buzz and then Becames silent...
other wise the sound is awesome... it rocks...
Can you
Hiss Sound
in Electronics chit chat
Posted
yes its a good one
No, Its on my guitar onboard
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 foot
no, Not much...