Improving a Clean Boost Guitar Pedal
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- เผยแพร่เมื่อ 25 มิ.ย. 2024
- This video look at how we can improve the basic Clean Boost (see previous videos) into a product that could be suitable for a commercial market. This is achieved by redesigning the power section, swapping the Op Amp and including RC filters.
00:00 Introduction
00:52 Overview of Improvements
02:16 Operational Amplifier Choices
04:02 Circuit Overview
04:39 RC Filters
08:15 Capacitor Charge Demo (DC)
10:53 Capacitor Reactance
13:33 Capacitor Reactance Demo
16:19 RC Filter Examples
20:13 RC Filter Demo
23:08 The Power Section
30:14 Reverse Polarity Protection
32:02 Reverse Polarity Protection Demo
33:05 Voltage Divider
34:21 The Input Section
42:22 The Amplification Section
48:03 The Output Section
51:27 Circuit Comparison
52:03 Conclusion
The notes shown in this video are here: bit.ly/3N4My9x
Other videos in the Clean Boost series:
1. Building a Clean Boost Guitar Pedal
• Building a Clean Boost...
2. Troubleshooting a Clean Boost Guitar Pedal
• Troubleshooting a Clea...
3. Modifying a Clean Boost Guitar Pedal
• Modifying a Clean Boos...
I am no expert in electronics, I remain a curious hobbyist. However, I have always been fascinated in learning how audio electronics works. Disassembling various radios as a kid and eventually becoming interested in designing and building guitar effects pedals. I attempt to understand how these systems operate electronically, and due to this approach, I have picked up a few bits of theory along the way. If you're unsure about it, my best advice is just get started, mistakes and corrections (and the occasionally popped component) is how we learn. You win or you learn
If you found this useful, want to correct my knowledge or want to know more about my DIY pedals and test gear leave a comment below.
Follow my other projects here:
/ beliefspacestu
If you'd like to support my channel and get some cool stickers, you can find my Etsy Store here (I'll be adding some electronics kits in the future): www.etsy.com/uk/shop/MusicTec...
This is so good! You are absolutely thorough and cleared up so many of the weird little questions. Got my summing amp across the finish line sounding cleaner than ever. Game changers filtering the battery, filtering pre-amplification, and the pulldown resistor. Thank you for walking through the math and using practical numbers :)
Excellent stuff on the summing amp, happy to have helped 👍
This video is great
I have to say this is the most brilliant explanation and tutorial I have ever seen in these circuits. You are a master at teaching these concepts and have helped me so much in understanding these circuits. Thank you so much!
Immensely helpful, thank you very very much!!
You're very welcome 👍
Thank you for filling in the missing details. I will have to watch again, ha ha.
Thank you for making these videos. I’ve been wanting to know how to make small amplifier circuits for years.
I also build my own pedals (since 6 years now) and your videos are the best, if not the only proper ones, explanation of the process I came across on youtube...excellent work
Excellent videos, thank you so much for making these. Very clear, logical, well paced. Love the theory, then test on breadboard and oscilloscope. Cleared up a lot of gaps in my learning
Awesome. Watching now
One of the best practical video I've seen - thanks 🙏🏻
Thanks for all your videos! Very informative 👏
This is excellent. Thank you!
Awesome work sir...
Fantastic video!
Thank you :)
usefully
Thank you for this video it was very helpful in understanding how distortion effects work. I hope it will get to more people because you've done a great job. I have just one question how is it possible that you get 4.5 V on the input of the op amp? Shouldn't some of the voltage drop across the 2M2 bias resistor and the 1K Rrf? Thank you for your answer.
Excellent observation. Yes, it will drop but insignificantly because the current is so small nanoAmps at the divider (100k) output and picoAmps after the 2M2, so for all intents and purposes it remains 4.5volts. Additionally we're using a TL071 here that has FET inputs, so that also helps negate the effects due to the massive input impedance. If you want to experiment further, nn the folder linked in the description is the Falstad emulation, you could have a play around with the values 2M2 and 1K resistors in the simulator (there's also a video on Flastad if you've not come across it before). Hope that helps.
Thank you very much that helped a lot.
Let say i would like to turn the boost into 20db, how should i do it? Great video, you deserve more subs🙏🏻🙏🏻
Thanks :) You were correct in the other comment about adjusting R1 and R2 👍
Great video! I think using a logarithmic potentiometer would lead to a more "linear" increase in volume, right? i've never experimented with that
You're right, our ears have a logarithmic response to sound levels. So, by using a logarithmic pot, we taper the pot for the way we hear.
i would like to make this pedal switchable between 3 and 5 dB.
Yes, you can use the gain calculation to adjust the feedback or the other resistor in the calculation. Staying with the Kilohm range.
Remember that it will also shift the cutoff frequency because of the capacitor in the feedback path of the OpAmp.
If you get stuck let me know and I’ll run some calculations for you.
I am curious why the extra divider after the power area with the 2M resistors if you already have Rd1 and Rd2 ?
Excellent question. The Cin Capacitor (10n) blocks DC (and low frequencies) so there's effectively no DC voltage division by the 2M2 resistors.
@@MusicTechknowledgyaha! ok thanks!
So if i was to make R1 330k I could decrease the amount of gain.
Yes, that’s right… gain(dB) = 20 x log (1+ (220/330)) which, if my maths is right, would equal around 4.44dB