Greetings,
I am working on a preamp for a guitar amplifier with opamps and you see the circuit i have come up with other circuits and experimenting. It seems to do well at least for my ears. Dont say that its low quality in know it is i would like to keep it smple. I would like to add a uper mid boost, say at 4 - 6 khz and a control for that(potentiometer). Where in this circuit could i do that, while keeping everything simple. I dont know how to design circuits so any help would be much Appreciated. And i forgot to mention I would like to add it after the switch which switches between clean and overdrive channels.
Best regards and many thanks in advance to anyone who repiles
I am working on a preamp for a guitar amplifier with opamps and you see the circuit i have come up with other circuits and experimenting. It seems to do well at least for my ears. Dont say that its low quality in know it is i would like to keep it smple. I would like to add a uper mid boost, say at 4 - 6 khz and a control for that(potentiometer). Where in this circuit could i do that, while keeping everything simple. I dont know how to design circuits so any help would be much Appreciated. And i forgot to mention I would like to add it after the switch which switches between clean and overdrive channels.
Best regards and many thanks in advance to anyone who repiles
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With no spec as to what frequencies & boost you want, I would point out that used graphic equalizers are going $40-60 on ebay. I liked the Peavey Q215 as being really quiet, and stereo which I needed for my PA application for 2 mikes. The Peavey Q431f turned out to be monaural, which annoyed me but would be perfect for your application. Put it between the guitar pickup and the power amp. Some of the other brands are hissy, brands come & go so fast I'm not going to point out the failures wasting room in my attic.
I used an equalizer to kill room howls caused by a person walking around with a microphone. I realize DSP are in now, but I don't carry a $600 cell phone or laptop computer around to program one. I just move the slider to what I want. Also, a slight boost to some ranges of my voice makes it sound a little less like Tommy Lee Jones (of the Fugitive, which is who I sound like with flat response).
At these prices you might get stuck with replacing a slider pot, or as I did on the Q215, fixing a dead channel by resoldering a bad joint on one IC. Or putting the thing back in a box and shipping it back for a refund. The Q431 was perfect except for being mono. The Q215 wasn't an ebay failure, it came with an entire "band leaving the road" PA setup with lots of little problems in everything but the speakers, which bargain paid for the rest of the boxes of bugs.
Once you find a curve you like, copy the op amp circuits in the equalitzer to put in your guitar amp so you don't have to carry an 8 lb equalizer to gigs. The schematics are available on line for Peavey equipment.
I used an equalizer to kill room howls caused by a person walking around with a microphone. I realize DSP are in now, but I don't carry a $600 cell phone or laptop computer around to program one. I just move the slider to what I want. Also, a slight boost to some ranges of my voice makes it sound a little less like Tommy Lee Jones (of the Fugitive, which is who I sound like with flat response).
At these prices you might get stuck with replacing a slider pot, or as I did on the Q215, fixing a dead channel by resoldering a bad joint on one IC. Or putting the thing back in a box and shipping it back for a refund. The Q431 was perfect except for being mono. The Q215 wasn't an ebay failure, it came with an entire "band leaving the road" PA setup with lots of little problems in everything but the speakers, which bargain paid for the rest of the boxes of bugs.
Once you find a curve you like, copy the op amp circuits in the equalitzer to put in your guitar amp so you don't have to carry an 8 lb equalizer to gigs. The schematics are available on line for Peavey equipment.
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