Call for comments: Blues Driver clone layout at gaussmarkov.net

[oomnelson]

Caspercody, I just checked all again, the jfet legs are all right, I discard the idea about BF245 as a wrong substitution for the J201 because as you said in a message before, you prove it and everything was fine. Q3, Q6 and Q7 transistors are fine too.
But, I found an error in a resistor: R18 5,6k ... I put in this place 6,8 k 
And the other error I found is caps C13 and C14 : 18 nf  both ... I put in this places 22 nf, because I couldn´t get 18 nf.
If I can´t get the 18 nf, I´m thinking in replace the 22 nf by 15 nf.
Thank you bro!

[oomnelson]

I made the changes, and same thing, now I checked all again and finally I found the real mistake I made, it was a microscopic bridge that basically made a short circuit, joining the positive 9 volts with the ground...   
Ok, after all the negative adjetives words against me, I decided to fix the mistake and test it again, of course, it much better, but the sound is still not good, I realize that in the mix of the polarities, some, or all the jfet, transistors, even the IC could died.
So, my next step is to change all the jfet, transistors and the IC... yes, I will take care when I soldering 
Thank you Caspercody for your assistance.

[caspercody]

If you can, use sockets for the transistors and Jfets. Makes it a lot easier to try different types, and change out if bad.

[oomnelson]

The Blues Driver clone works great!... thanks for this project.
I made some changes, as fets I use 2SK117, it works perfect, better than the BF245.
For the IC, I put in a 4559, that´s a direct replace for the M5218AL, which is the Boss BD-2 IC. It works better than the TL072 for my taste. And I´m thinking to test the NE5532.
And finally I made all the Keeley changes, including the Phat mode. I recomend this changes, it improve a lot the tone and performance.
In some days I´ll test our BD-2 clone with an original Keeley modified side by side. I will post the results.

[oomnelson]

After a while, I´m here again, I did the test between the original BD-2 with the Keeley mod and our BD-2 Clone version (which I applied the keeley mod too). The BD-2 clone sound a little better, it is difficult to express with words, the pedal is the same, but the tone seems to be with a little more body in comparison with the original. I think it could be because I used all the best quality components.

Thank you Gaussmarkov!

[dadomaygilmour]

Hi!

I'm trying to simulate with spice this circuit but...just before the 2nd discrete opamp (after the input high pass filter) I see a voltage of about few nV...I think that it is impossible, isn't it? Before the HPF all works...I check 1,000 times the connections and the component values....

[IMG=http://img88.imageshack.us/img88/8649/bd2eb.jpg][/IMG]

Uploaded with ImageShack.us

The image is too small...so C7 = 0.047uF, C6 = 0.1uF, C17 = 2.2nF ...etc...

Please help me!!!!!

[dadomaygilmour]

Help me please! I haven't found my error yet

[slacker]

I think the problem is you have used 1M for the resistor value, in PSpice this means milli not Meg so you've got a 1000th of an Ohm resistor there which will basically shunt most of the signal to VREF. You need to use 1 meg or 1000k instead.
The 2M at the start should be changed as well although this won't cause a problem because the voltage source can provide infinite current so it doesn't care what resistance you connect to it.

Have a look here for more info http://web.doe.carleton.ca/~tkuend/ELEC3509/pspice_tutorial/pspice_tutorial.html

[dadomaygilmour]

Yeeeah!!!       

I've never used a resistor of 1Meg in pspice before...

Thank you very much!!!!!