I like how you start on some rockstar riffs then descend into complete professional nerdness and then emerge again with some fat overdrive - nicely done.
That’s quite a clear explanation of the circuit. Nearly everything in the circuit is well explained except the choice and positions of the transistors to be perfectly matched. The current mirror circuits can be further improved to cancel out the mismatch. Great as always. Thanks for the video.
@@PhilsLab . . . on a subconscience, you're taking everything to 11 and it shows . . . enjoy your vidoes . . . I've watched the Kicad 6.0 PCB one a dozen times using it as a pattern for my first Arduino (don't hate me) PCB project . . . can't thank you enough for creating that. Also, learning a ton from your other videos . . . I have a PT100 based circuit that I plan on refactoring and incorporating the DSP stuff so that I can get a steady temp measurment from it . . . there's a tad bit of noise I want to extract to stablize the readings without compromising responsiveness to change. Thanks again man! Keep it coming!
Great build! I would suggest to anyone making this to replace R6 with a 5k trim pot. This will allow you to adjust the DC bias point voltage of the source follower (ie the base voltage of q5). JFET's have large parameter spreads from device to device so this will help you match the results he shows in his time domain. You will also be able to dial this knob and adjust at what input amplitude clipping starts.
If the cost of Altium's license was close to subscription cost of my netflix account which I use only once or twice a month than I'd have purchased the subscription by now. I really hope Altium will pay attention to hobbyist demography who use such design packages once or twice a month and mostly for hobby non-commercial project. (NO their web based free application is crap and nothing like the actual Altium software).
Awesome content as always. I will soon be graduating as a CSE. I will try to reach your current level of knowledge the next years. I hope I can buy you a beer someday as a token of appreciation.
I'm a bit confused why cascading them causes clipping when you adjust the second boost circuit, when the first circuit is at unity gain. Aren't they both powered from the same rail, and you'd get the same voltage swing capability out of each? Great video though!
The ltp amplifier is a type of differential amplifier, or another name for differential amplifiers ?(English is not my first language) This project is especially interesting to me, as just this semester I learned about differential amplifiers and op amps
LTP (Long Tailed Pair) is nothing but another name of a differential transistor pair with a current source for polarization. Most bipolar OpAmps are having this kind of input stage (sometimes using PNP BJTs; e.g.LM358 for rail to 0V input when using a single rail supply).
Thank you! Smallest SMD size is 0603, then a couple 0805s for the larger decoupling caps, some small-ish diode packages (SOD-323, 0402 for TVS), and SOT-23s for the transistors.
Boost files (schematic, manufacturing) are available here: github.com/pms67/GBS-Boost
❤️❤️❤️
I like how you start on some rockstar riffs then descend into complete professional nerdness and then emerge again with some fat overdrive - nicely done.
Agree, this also totally got me! :)
Haha thanks - thought I'd try and mix it up a bit! :D
That’s quite a clear explanation of the circuit. Nearly everything in the circuit is well explained except the choice and positions of the transistors to be perfectly matched.
The current mirror circuits can be further improved to cancel out the mismatch.
Great as always. Thanks for the video.
@14:56 . . . amplification of 11 . . . I'm sold . . . make sure the dial has 11 on it . . . It's the details
Haha I'm surprised I didn't even catch that while making this thing... :P(
@@PhilsLab . . . on a subconscience, you're taking everything to 11 and it shows . . . enjoy your vidoes . . . I've watched the Kicad 6.0 PCB one a dozen times using it as a pattern for my first Arduino (don't hate me) PCB project . . . can't thank you enough for creating that. Also, learning a ton from your other videos . . . I have a PT100 based circuit that I plan on refactoring and incorporating the DSP stuff so that I can get a steady temp measurment from it . . . there's a tad bit of noise I want to extract to stablize the readings without compromising responsiveness to change. Thanks again man! Keep it coming!
Thank you very much, Curt! Many, many more videos to come :)
Great build! I would suggest to anyone making this to replace R6 with a 5k trim pot. This will allow you to adjust the DC bias point voltage of the source follower (ie the base voltage of q5). JFET's have large parameter spreads from device to device so this will help you match the results he shows in his time domain. You will also be able to dial this knob and adjust at what input amplitude clipping starts.
Wow I remember learning this in college, but forgot about it until just now! Exciting to know that I can follow along with this video!
FELLOW GUITAR PLAYER AND ELECTRONICS DESIGNER!
Cool video man, keep it up!
Thank you! :)
Guitars and electronics - how on Earth was I not subscribed to this gold mine earlier??
Glad to have you with us now! :)
Amazing vid! Hope to see more pedal designs here in the future ;)
Thank you, Diogo! Many more pedal designs to come - I'm designing/preparing/ordering quite a few different circuits (ODs, delays, etc.).
@@PhilsLab Great, if some day you could do an envelope filter pedal that would be awesome!
Great work, I enjoyed the walk through of the circuit...cheers.
Thanks a lot, Andy!
absolutely love this phil! thanks for keeping us novice EEs inspired
Thanks, Jacob!
A nice little bit of "Crazy Train" at the end 👍
1:52 "Rather overkill for this application" Ha ha I love it! There's nothing wrong with overkill mate! Great video...
Haha thanks, Rob!
If the cost of Altium's license was close to subscription cost of my netflix account which I use only once or twice a month than I'd have purchased the subscription by now. I really hope Altium will pay attention to hobbyist demography who use such design packages once or twice a month and mostly for hobby non-commercial project. (NO their web based free application is crap and nothing like the actual Altium software).
Great skid row solo!
Thanks, Alex!
Awesome content as always. I will soon be graduating as a CSE. I will try to reach your current level of knowledge the next years. I hope I can buy you a beer someday as a token of appreciation.
Thank you very much, Alexandros. Well, if you're ever near Heidelberg in Germany, let me know and we'll grab a beer!
Nice intro Phil
is that charvel custom ? what a cool man . . . . me as a embedded software engineer really impressed with your content
Do you recommend the input diods and resistor/capacitors universally, or are there situations where they do more harm than not?
Would you consider putting a limited run of the completed boards up for sale? Bet there'd be plenty of people interested.
Just the boards, or assembled in an enclosure? I've considered putting some PCBs up on a webshop/Tindie/similar.
I was thinking just completed boards to house however a person likes. Would save on shipping costs too that way.
This is amazing and i wish I could make it myself someday.
Thanks, Moses!
How linear your input buffer (which is our of the loop) is? What was a reason to add a fet buffer instead of fet driven differential stage?
Ok, the Skid Row solo is even more impressive than the electronics knowledge :)
Thanks John :D
I'm sure you've gone over it somewhere, but why would you want to keep the audio traces as thin as possible?
Skid Row - 18 and life, YEAH!
Love you Phil.
Thanks
How to learn this type of electronics?
Any books you recommend?
Any book by Douglas Self. In particular, 'Small Signal Audio Design'.
Also take a look at the DIY Stompboxes forum: www.diystompboxes.com/smfforum/
Why the 2sk208 specifically ?
I'm a bit confused why cascading them causes clipping when you adjust the second boost circuit, when the first circuit is at unity gain. Aren't they both powered from the same rail, and you'd get the same voltage swing capability out of each? Great video though!
NVM I see the v/div changed and I didn't notice, so the first stage wasn't at unity.
Thanks - yeah, the scale changed during the transition!
@14:56 so these do go to 11, nice
I can't believe I missed that - great catch! :D
The ltp amplifier is a type of differential amplifier, or another name for differential amplifiers ?(English is not my first language) This project is especially interesting to me, as just this semester I learned about differential amplifiers and op amps
LTP (Long Tailed Pair) is nothing but another name of a differential transistor pair with a current source for polarization. Most bipolar OpAmps are having this kind of input stage (sometimes using PNP BJTs; e.g.LM358 for rail to 0V input when using a single rail supply).
Great video 🔥🔥
Thanks!
Something they don't explain in university properly 🙄
Yep. My professor never taught me how to shred.
Great video, Phil. Curious what size smd you are using. Thanks.
Thank you! Smallest SMD size is 0603, then a couple 0805s for the larger decoupling caps, some small-ish diode packages (SOD-323, 0402 for TVS), and SOT-23s for the transistors.
@@PhilsLab 👍thanks
Visiting the Genius Again to grab some chips as a beginner !
Sounds ace!
Thanks, Jason!
thx for that -I´m in audio, pls do more of it.....headamp?
Thanks, Harald - I have a headphone amp design on my channel ('massively parallel NE5532').
Crazy Train, at the end?
Yep :)
That's amazing
Thank you, Mahmoud!
Dude . . . nice . . .
amazing
So much engineering only to disturb your neighbors! 👌
Exactly! :)
👍🙏❤
18 and life padal 😀
Exactly :D
skills! :D
Thanks, Bart :
Great video, but man, the way you pronounce potentiometer threw me off for a second lol.
Can you share your email please. Need your thoughts. Cannot discuss too much here.