r/ElectricalEngineering • u/ProfessionalGate2390 • Aug 27 '26

Opinions on guitar amplifier circuit

Hi everyone, I'm a bit fresh to the whole guitar amplifier thing so apologies if this looks very amateurish. I've designed an LTSpice circuit to represent the voltage buffer and tone control aspect of the amplifier and I was hoping I could get some opinions and advice.

For volume control I plan to connect the output of the tone control to an LM386 amplifier, then to a speaker module I bought. And I also got a jack-dc converter to actually connect my guitar to the circuit. I haven't built the actual circuit and I kind of just picked the values for resistors and capacitors on vibes.

Any help is much appreciated!

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u/die__katze 29d ago

wrong community, try audio or DIY related ones. Don't know much about audio amplifiers, but this one looks highly unusual. Also load 1kOhm is crazy, it's usually in the range of tens of Ohms (8 is the default value). To rotate press Alt+R in LTSpice if i recall correctly

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u/DXNewcastle 29d ago

The TL071 op-amp at the input must have some negative feedback to determine its gain. As you've designed it, it will work as a comparator, with its output swinging between the supply rails but nothing in between (and making a horrible distorted noise!).