Here's a collection of vero (stripboard) and tagboard guitar and bass effect layouts that we have put together covering many classic and popular effects in growing numbers. Many of these have been posted on freestompboxes.org, so check that site out for great discussions on building your own effect pedals. Enjoy the builds and please also visit us on Facebook and Twitter
Here is a layout for the Brunetti Mercury (should fit in a 1590B size box).
Frank_NH has uploaded another verified, slightly modded version in the Forum section a while back.
This is the best video I could find (in Thai language):
Whoa, what a great layout, turned out pretty compact. I've made one of those using the layout Frank posted at the forums and gawd, it's my favourite gain box, I've using it in my pedalboard as my main od/distortion pedal since then. Guess I'll build one more
Nice layout, Alex! This is really good overdrive/distortion, and I hope others will give it a try with this more compact layout. I should note that the 3.3nF cap next to Vol 3 rolled off too much treble for me, so I replaced it with a 390 pF cap. Also, you can use other JFETs in place of the J201s (e.g. 2N5457), which will lower the gain some.
I built mine with 2n5457 . nor as wooly as the demo but more than enough gain for my taste. Maybe ill make this one with the j201 since its not verified yet just to compare.
Thanks for the layout, looks like an interesting distortion. Went through your layout and seems to be ok to me comparing to the schematics on FSB, except for the resistor from Body2,3 to ground. In your layout it is 4k7, while on the schematics available it is 10k. Could you please doublecheck? Or do you have a different source for the schematic?
Ok it's verified, you just need to swap volume & gain leads 1&3, and probably also bite (as you get more treble CCW but maybe it's like that on the original). I will replace the gain pot with a lin tapper as I get almost immediatly full gain. I also socketed that 3n3 cap and like it better with 1n Very nice sounding distortion
Good Job. Its cool isnt it. I realluy like this pedal. I made mine with the 2n5457. I didnt have a trimmer but i did match the jfets to .01 volts. Did you use the j201 or the 2n5457? Did you match them? Is it as wooly as the demo. With the 2n5457 its not quite as wooly but plenty of gain.
I tried both and like it better with J201, a bit smoother. I biased the drains at 8.2V as I get 16.4V out from the TL071 with my power supply. 100k lin for the gain, 500k lin for body and 100k log for the volume are the pot values I ended with
interesting . ill play with those pot values. thanks for the response. Ill make one of these soon. I just got a bunch of j201 but the voltages test low probably factory rejects but ill give them a shot. Did you match them at all?
interesting . ill play with those pot values. thanks for the response. Ill make one of these soon. I just got a bunch of j201 but the voltages test low probably factory rejects but ill give them a shot. Did you match them at all?
That's right vol 1 should go to ground but OTOH I really had to swap the leads. Maybe I confused the legs on the pot, you should wait for a 2nd advice before modifying the layout. Pics of my build : http://www.casimages.com/img.php?i=16050803593614005914208817.jpg http://www.casimages.com/img.php?i=16050803594114005914208818.jpg strassercaster no I didn't match the J201, I picked the 2 first that came to my hand from the box
I strongly advise you to get SMD J201 with adapter board they are much much more reliable and sound way better in these kind of circuits http://www.diyguitarpedals.com.au/shop/index.php?main_page=product_info&cPath=6&products_id=52
you should also make the rg keen improved jfet matcher and try to find a couple j201 that read VP .71 and IDSS at .03 or .04 . That is the perfect measurement to bias with the 22k drain resistor. when you use trimmers it does affect the tone of the pedal .Once i figured this out and got the right jfet it sounded much better and even more like the real deal.
Whoa, what a great layout, turned out pretty compact. I've made one of those using the layout Frank posted at the forums and gawd, it's my favourite gain box, I've using it in my pedalboard as my main od/distortion pedal since then. Guess I'll build one more
ReplyDeleteNice layout, Alex! This is really good overdrive/distortion, and I hope others will give it a try with this more compact layout. I should note that the 3.3nF cap next to Vol 3 rolled off too much treble for me, so I replaced it with a 390 pF cap. Also, you can use other JFETs in place of the J201s (e.g. 2N5457), which will lower the gain some.
ReplyDeleteI went ahead and built 2 from your layout, Frank! I subbed the 3.3nF with 1nF in mine
ReplyDeleteI built mine with 2n5457 . nor as wooly as the demo but more than enough gain for my taste. Maybe ill make this one with the j201 since its not verified yet just to compare.
ReplyDeleteverified?
ReplyDeleteNot verified yet.
DeleteThanks for the layout, looks like an interesting distortion. Went through your layout and seems to be ok to me comparing to the schematics on FSB, except for the resistor from Body2,3 to ground. In your layout it is 4k7, while on the schematics available it is 10k. Could you please doublecheck? Or do you have a different source for the schematic?
ReplyDelete4K7 is the corrected value.
Deletehttp://www.freestompboxes.org/viewtopic.php?f=7&t=9846&p=253908&hilit=brunetti#p253908
Oops... I missed this one, thx.
DeleteI'm currently buildind it but I realise I don't have any BAT85 diode.
ReplyDeleteWould any 1N58XX be a good replacement ? I also have a few BAT46...
Thanks
you can use anything, the 1N58xx will be as good as the BAT85, is just for the charge pump section
DeleteCool thanks ;-)
DeleteI forgot to write the type of diodes!
DeleteI've added it.
As Guilherme said, they are 1n5817 but any 1n58XX would work.
Thanks Alex I'll report back on friday
DeleteI used a 50kA pot instead of the 1M for 'Body'. I noticed that the 1M maxxed out when increased about 10%. The 50k pot gives a great range of tone.
ReplyDeleteOk it's verified, you just need to swap volume & gain leads 1&3, and probably also bite (as you get more treble CCW but maybe it's like that on the original).
ReplyDeleteI will replace the gain pot with a lin tapper as I get almost immediatly full gain.
I also socketed that 3n3 cap and like it better with 1n
Very nice sounding distortion
Good Job. Its cool isnt it. I realluy like this pedal. I made mine with the 2n5457. I didnt have a trimmer but i did match the jfets to .01 volts. Did you use the j201 or the 2n5457? Did you match them? Is it as wooly as the demo. With the 2n5457 its not quite as wooly but plenty of gain.
DeleteI tried both and like it better with J201, a bit smoother. I biased the drains at 8.2V as I get 16.4V out from the TL071 with my power supply.
Delete100k lin for the gain, 500k lin for body and 100k log for the volume are the pot values I ended with
interesting . ill play with those pot values. thanks for the response. Ill make one of these soon. I just got a bunch of j201 but the voltages test low probably factory rejects but ill give them a shot. Did you match them at all?
Deleteinteresting . ill play with those pot values. thanks for the response. Ill make one of these soon. I just got a bunch of j201 but the voltages test low probably factory rejects but ill give them a shot. Did you match them at all?
DeleteThank for verifying it!
DeleteAre you sure you need to swap legs 1 & 3?
If lug 3 would go to ground the volume would work in the opposite direction.
That's right vol 1 should go to ground but OTOH I really had to swap the leads. Maybe I confused the legs on the pot, you should wait for a 2nd advice before modifying the layout.
DeletePics of my build :
http://www.casimages.com/img.php?i=16050803593614005914208817.jpg
http://www.casimages.com/img.php?i=16050803594114005914208818.jpg
strassercaster no I didn't match the J201, I picked the 2 first that came to my hand from the box
Like this one. Used J201s. Didn't match my J201s as i used smds.
ReplyDeleteReally cool sound pedal.
ReplyDeletejust a low gain to my taste.
is there a way to increase the gain(i build it with j201)?
thanks
mine has tons of gain did you bias the Jfets to 9v?
DeleteThis comment has been removed by the author.
ReplyDeleteep strassecaster i did bias them to around 9.5v
Deleteeverything works just fine.
sound like a medium overdrive.
Would the 2N5458 also work for this project? I am buying parts from TAYDA and they don't have the J201 or 2N5457.
ReplyDeleteI strongly advise you to get SMD J201 with adapter board they are much much more reliable and sound way better in these kind of circuits
Deletehttp://www.diyguitarpedals.com.au/shop/index.php?main_page=product_info&cPath=6&products_id=52
you should also make the rg keen improved jfet matcher and try to find a couple j201 that read VP .71 and IDSS at .03 or .04 . That is the perfect measurement to bias with the 22k drain resistor. when you use trimmers it does affect the tone of the pedal .Once i figured this out and got the right jfet it sounded much better and even more like the real deal.
Delete