Uni-Byte 0260 - We BUILT This and THIS Happened: Easy Guitar Amp: Part 2

Simple but sweet, I always wanted to drum but never got to it and to lazy to buggar around with guitar.

Nice and simple design, it would be great to add the tone control, pre-amp and buffer. I look forward to the next video.

Still suggest also looking at putting a 1k or 2k R between opamp output and circuit output, it might help clean out the last hint of the crossover distortion. Did you also try 4 silicon diodes instead of 3 silicon and 1 schottky? The faster recovery speed of the schottky might have a behaviour impact, or might be irrelevant, not sure. Also the schottky will have a lesser diode drop, so not match the diode drops of the darlington.

edit: If you look for the video "Biasing amplifier transistors" by DiodesGoneWild, he talks about two very interesting concepts. The first one is the implementation of what I'd term a "configurable diode", using a transistor, pot, and two resistors. It's a very neat circuit trick. The resistors around the diode allow to create a "configurable diode voltage drop", where one can tweak the pot to get just enough voltage biases. He also shows how one of the resistors needed to be changed so that the lower power BJT was properly biased. The second concept is a mention of the through-resistor that I talk about at the top of my comment, at the end of the video, and how / why it works.

So you may like experimenting with using these concepts to improve the cross-over to perfection... or not...

Replace the positive diode coming off the op amp (the middle one of the 3) with a 100 ohm variable resistor for an adjustable bias to get it just right. A 100 pf cap across the 100k feedback resistor would fix your high frequency woes. This amp could be configured to run off of a virtual ground split supply using transformers without a center tap which would inherently provide speaker protection in the case one of the outputs shorts, and allow a cheaper power transformer.

👍👍👍👍👍