Introduction: Clean Boost for Electric Guitar
This is one of the simplest OpAmp circuit which can be used as a clean volume booster or as an preamp into your speakers. With this simple circuit you can turn your any speaker system into a guitar practice amp. I first created it in separate box and then I directly installed in speaker itself using mini monojack socket so it can serve me as pedal too :)
This is a transparent, clean guitar booster for solo’s and other times when you need a couple of extra dB’s.
You can also use it to get some more gain out of an amp or distortion pedal. The circuit is a very common amplifier circuit built around a TL071-opamp. Other OpAmps can be used as well, but the TL071 is cheap and produces very little noise.
The ‘Boost’-knob controls the amount of boost, but can also attenuate the signal so you can use it as a sort of pre-settable volume knob.
• The maximum gain of this circuit is about 10 dB. If you need more (which I doubt), increase R2 (or decrease R1). The gain A = 20*log(1+(R2/R1))
• Rp is optional, it’s a pulldown-resistor to avoid ‘switch-popping’ when the effect is turned on. (I used it in my circuit)
• The circuit also acts as a buffer since it has a high input impedance (about 1 MOhm). This will give you more overall ‘clarity’ (high frequencies) when you’re using long cables.
• The booster is preferably used at the very end of the effect chain, just before the signal goes into the amp-input (or FX-return when using your amp’s effect loop).
(I got details from this link http://www.jer00n.nl/2010/07/28/clean-boost-for-guitar-or-bass/)
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Hi, I'm a senior newbie at electronics. Some of the capacitor symbols have polarity and some don't. Are they different kinds of capacitors? For example ceramic and electrolytic? Or can any kind be used as long as they have the right values?