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Yet most desire something resembling **THAT kind of TONE** and are often prepared to pay big dollars to get it. Those old Marshall Amps are devoid of treble above 4,000 CPS. Some of the most revered Amps of yesteryear have absolutely shocking hi freq response.
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Re hi freq loss due to lower input impedance
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I'd breadboard this stuff anyway so you soon get to work out what values to use.Īs should be obvious, these 2 circuit have close to identical outputs, the first (u1) will be quite, while the gain is kept small but if you crank up R4 and R11 the circuit with the buffer (u2-u3) will be substantially quieter. Note I've not bothered to use exact values on the pic so up to you to work out the gain stuff.
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With operational chips costing only a few more cents than a single transistor you may as well use opamps. If it's good enough for a lot of the betterĮquipment makers, then it's good enough for me, wink. Open a lot of pro gear and you will often find an opamp buffer is the very first thing the signal passes thru. Replace the opamp buffer with a transistor if you wish,The opamp is obviously better. The pic should give a rough idea of how to keep the noise gremlins OUT. The trick is knowing where to use that loss to maximise the effect of tone shaping.<< Go turn up ALL the sliders on your graphic EQ and you have max tone but of course it's useless used in that manner,There has to be loss for it to work well. If max power transfer was the game then we would all be using oxygen free copper wire to join the nodes and hang 10 meg resistors off every input,Ker?Ĭricky This is an amplifier not a race car!! I tend to listen carefully when folks have built Real world equipment and are working LIVE players or at least worked a lot with stage equipment. Again I stress each techno freak has differing views on this but this is my way. >Sadly the possibilities in electronics is just so vast that what might work in an **ideal perfect text book world** is more often than not, going to have Hi Matt, obviously you are still a bit confused. I don't think we've reached a definitive conclusion. Right, but one of the things postulated here was that an op-amp as a non-inverting amplifier, with some gain, - could have a high enough input impedance on its' own. DrNomis wrote: Well, I reckon you probably will need a buffer of some sort to provide a high enough input impedance for a guitar, the output of a guitar is usually at a high impedance (for passive pickups), a buffer will make the effect sound brighter, personally I think it's good design practice to design for a high input impedance, and a low output impedance anyway.
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