Op Amps: Guitar Fuzz!

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Electronics with Professor Fiore

Күн бұрын

Пікірлер: 15

@CornelionSigismon 9 ай бұрын

I discovered your channel yesterday. You're a boss, I love it!

@JohnWiku 9 ай бұрын

Professor Fiore! You are a treasure!! Would you be able to put together a class on high voltage JFET or MOSFET as replacement for tube driven gain stages? Aka LND150 transistors and such? You're a rockstar!! Keep it up and I'll be here to learn everything I can from you!!

@ElectronicswithProfessorFiore 9 ай бұрын

I do have a number of videos on JFET and MOSFET amplifiers. These are found in the Semiconductor Devices playlist.

@SuburbanDon 9 ай бұрын

I also just discovered this channel. Good job.

@JonDeth 9 ай бұрын

*Designing music gear is what motivated me to eventually enroll in college.* Before that, I lucked my way through an op amp based soft-clipper that I've used for 15 years and never changed, not even after going to school and having a far better understanding and ability of the science. *Tubes are great, but people truly misunderstand the potential of semiconductors.* After going to school, I've always felt we can achieve a lot more dynamic and clever schemes using them, and with enough thought and care, they greatly outperform tubes. *You covered what I'm pursuing ATM with a voltage divider so a hard clipping scheme in fact, clips softly with a round knee.* And now with the tremendous advancements with digital topology, which I once despised, it's at the forefront of performance in music gear. I am still striving to produce analog processing that will be digital microcontroller controlled.

@ElectronicswithProfessorFiore 9 ай бұрын

If uprocessor control is what you're after, look around for an old book called "Musical Applications of Microprocessors" by Hal Chamberlin. I had the 1st edition when it came out circa 1980 and then gave it away when the 2nd ed came out 1985-ish. Still have it. Some of it is a quite dated but there are good ideas in there. I don't know if it ever went OER or public domain. Look around for it in the usual places.

@JonDeth 9 ай бұрын

@@ElectronicswithProfessorFiore I'll see if I can find a copy online. I had a realization that the Arduino is ideal for this, so I ordered some digital potentiometers and have been studying the Arduino extensively. I haven't really done anything with electronics for quite a few years, but it's better late than never.

@ElectronicswithProfessorFiore 9 ай бұрын

@@JonDeth In case you're not aware of it, I have a playlist of videos that covers programming the Arduino using C. The first half of the book explains the C language, the second half takes apart the Arduino Uno. I focus on a generic microcontrollers approach instead of just using the standard Arduino libraries (which can be inefficient for some applications). As usual for my stuff, the text (and associated lab manual) are free OERs.

@JonDeth 9 ай бұрын

@@ElectronicswithProfessorFiore ty. I'm jumping right on it because you do a great job teaching. You're thorough and go through everything in a rational order. I've been out of school for almost 11 years, and have to do a lot of review in analog while I also learn C, some C++ and arduino, but am still fortunate I completed as much school as I did. I found a circuit clip of a high gain dual op-amp distortion, and 3-band EQ I built 9 years ago that sounds dead on to an EVH 5150 and the Mesa dual rectifier specific to shredding metal solos and rhythms, as well as complex instrumentals. Now granted I still have the op-amp clipper and the 3rd stage was simple, I can't even remember what that 3rd was and just that it was a BJT I was overdriving lol.

@jimbelcher6877 9 ай бұрын

Another interesting circuit. Big question for me is that your output on the second circuit seems to be more line level than instrument level. Someone using this circuit might want to use this in a stomp box chain, where the next box in line is expecting an instrument level signal. It seems I am always fighting this battle with different signal levels. I guess I don't understand them well enough. Might be an ideal for another video.

@ElectronicswithProfessorFiore 9 ай бұрын

There is an issue regarding the lack of standardization, particularly when it comes to guitars. Some pickups are very "hot", producing output much larger than is typical. We've got two more-or-less standard levels, pro audio and consumer audio where 0VU is well defined, but then there's "instrument level" which is a bit fuzzy. A modern high end keyboard would have dual outputs, usually XLR for pro level and 1/4" for consumer level. Older keyboards might have RCAs and are likely operating at consumer level. Then comes vintage equipment. Probably consumer level, but who really knows? Guitars and basses, well, how old is it? Does it have active or passive pickups? Are the pickups "hot"? How does the musician play? Do they have a light touch? It's certainly not like saying "0 VU is 0.775 volts" or some such. And when it comes to effects, as you say, where they are placed in a chain makes a huge difference. Swap the order of a fuzz box and a flanger or EQ and check out the difference!