Great field of study! Good luck on your exams.
Your first assignment after exams is to convert these output drivers to MOSFET.
-Frank
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GK rails in a pedal?
- Thread starter sprag
- Start date
Great field of study! Good luck on your exams.
Your first assignment after exams is to convert these output drivers to MOSFET.
-Frank
That would be really cool to build this pedal. If its not horribly hard. Looks like you guys have put a lot of thought and work into it and I cant wait to see/hear the final product!! Thanks so much for posting all this Frank and John, you guys rock. It would be awesome to see more threads like this. If I ddont speak to either of you by tomorrow through the forum, I hope the both of you have a wonderful New Year tonight!!! Thanks again.
+1 million. However, the danger would be that our collective wallets would get injured - even though I am *not* a fan of GK amps or their sound, it has been so fun to follow this process and thread that I am going to strongly consider buying one of these once done.
I happen to love GK so this pedal is right up my alley. I have had the GK Diesel Dawg clone but that wasn't quite what the Rails pedal is to my understanding. The Rails pedal is the GK growl people always talk about. IMO, if and or when this pedal sells, it will be in demand. I believe there are tons of guys out there that have used or are on the lookout for GK amps for the legendary growl factor. Thats how I see it anyway. The word growl has always been synonymous to GK as long as I can remember.
- Feb 16, 2008
- 21,240
- 23,634
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- John K Custom Basses
hey Frank, what's the polarity of C1? in most circuits, I usually have the negative facing lug 3 of the output pot but in this one's case, i'm not sure.
I would use a non-polar electro for C1, because there is no bias voltage on either side of the cap to hold polarity. You could use a 1uF for C1.. it will still have a corner freq of 16Hz with a 10K pot and a zero ohm R7 (worst case).
-Frank
- Feb 16, 2008
- 21,240
- 23,634
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- John K Custom Basses
I do have non-polar 4u7's so I think that i'll just use that for C1.
I have 10u non polars but they're pretty big (tall) so I think that the 4u7 will work fine.
I have 10u non polars but they're pretty big (tall) so I think that the 4u7 will work fine.
I just matched Duke's contribution to help offset parts. Thanks for sharing this process.
Oh definitely, there are tons of GK fans out there, this has the potential to sell really well, even beyond TB. For me personally it has been the watching of the process that has been so compelling and interesting. I'd be willing to bet that if other pedal builders did this sort of an interactive "demo" of sorts with conceptualizing and designing a pedal, it would draw other people in and make them fans of the builder, if not a customer for the product. I already had huge admiration for John and his contributions to this site, and desired his pedals before, but there is something special about what is transpiring here.
I just did the same. And, Frank, I will donate the price of a DB-CL if you just notify me already
Me three, another $10 coming your way John. This is more fun than going out to see a movie in the theatre!
EDIT: Make that me four, nshuman just beat me to it!
- Feb 16, 2008
- 21,240
- 23,634
- Disclosures
- John K Custom Basses
thanks for the donation Bryan!
and thanks everyone else, but IMO, most of credit really goes to Frank for designing it. i'm just the guy that's trying to turn it into a physical reality.
and thanks everyone else, but IMO, most of credit really goes to Frank for designing it. i'm just the guy that's trying to turn it into a physical reality.
Good point. Is there an email for Frank available, I don't mind matching the donation on the other side, it only makes sense.
Thanks to both of you. This has been fascinating to watch unfold. As most of you are aware I have 4 of John's pedals and a db cl. These guys do amazing work. And. ......since im a preamp freak ill be in line for one if they become available
Yep I'm also happy to donate to offset the cost of Frank's software and years of design experience...just give me til Friday . I figured if enough people chipped in to John's fund he'd buy Frank a nice pair of socks or something at the end, anyway...
. I figured if enough people chipped in to John's fund he'd buy Frank a nice pair of socks or something at the end, anyway...
4.7uF is a good value for C1. The 10uF was overkill, but I like to go way too big so that when testing freq response the input and output caps do not make an impact on the results for the rest of the circuit. This amp runs flat from 20-20KHz and all of the circuitry for the audio signal in the amp section (between its input and output caps) is DC coupled. I just think DC coupling is so cool! I know!---->NERD!
I am anxious to hear what this sounds like. So if you guys want to contribute to me, then please post sound files of this pedal. That's more than enough for me, I did this for the fun of it... John is the one who needs hardware.
-Frank
I just did the same. And, Frank, I will donate the price of a DB-CL if you just notify me already
We are our last batch of DE-CL's for this build cycle. Then we will be into the DB-CL cycle.
-Frank
- Feb 16, 2008
- 21,240
- 23,634
- Disclosures
- John K Custom Basses
I got the newest V4 version pcb etched and drilled so all I have to do is mount the components.4.7uF is a good value for C1. The 10uF was overkill, but I like to go way too big so that when testing freq response the input and output caps do not make an impact on the results for the rest of the circuit. This amp runs flat from 20-20KHz and all of the circuitry for the audio signal in the amp section (between its input and output caps) is DC coupled. I just think DC coupling is so cool! I know!---->NERD!
I am anxious to hear what this sounds like. So if you guys want to contribute to me, then please post sound files of this pedal. That's more than enough for me, I did this for the fun of it... John is the one who needs hardware.
-Frank
it'll probably be several hours before I can test it since it's new years eve (and i'll be spending time with my wife) but as soon as it's completed, i'll post some sound clips.
luckily, I just found another stash of LF353N's (10 more) so after testing it with a TL072, i'll pop one of those in it.
happy new year Frank (and everyone else)!
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Oh definitely, there are tons of GK fans out there, this has the potential to sell really well, even beyond TB. For me personally it has been the watching of the process that has been so compelling and interesting. I'd be willing to bet that if other pedal builders did this sort of an interactive "demo" of sorts with conceptualizing and designing a pedal, it would draw other people in and make them fans of the builder, if not a customer for the product. I already had huge admiration for John and his contributions to this site, and desired his pedals before, but there is something special about what is transpiring here.
If John didn't jump in with all of the prototyping we would not have made it to version 4. I have never been 3,000 miles away from the first prototypes of one of my schematics... I'm usually only inches away from it. So this is a first for me, this was fun and I could see me doing something like this again in the future.
Happy new year to you John and everyone following this thread!
-Frank
