Wich Acoustic Simulator project?

zeta55 · September 24, 2009, 01:54:22 PM

Here's an updated version, shure hope this one is free from errors

http://www.zeta-sound.se/woody/WoodyDIYrev1.rar

/Krister

Slade · September 24, 2009, 03:23:09 PM

Do anybody have demos of your DIY clones of this pedal? The demo of the manufacturer is just awful!

Mark Hammer · September 24, 2009, 04:48:29 PM

The zipfile on my website contains a sound-sample.

served · September 27, 2009, 01:02:19 PM

I failed with my build. Im going to make a new one i think. I really dont know whats wrong with it, but it doest do the job.
Has someone actualy built it?

Andre · September 27, 2009, 05:51:35 PM

Quote from: served on September 27, 2009, 01:02:19 PM
I failed with my build. Im going to make a new one i think. I really dont know whats wrong with it, but it doest do the job.
Has someone actualy built it?

I built one last week and it works.
I have made a new PCB layout that will fit in a 1590B enclosure.

I do like the sound of this thing.
It sounds nice when used with my Tele, but only if I play chords.
If you play single notes it has a sort of metallic sound.

I will post the transfer and the layout and maybe a soundsample shortly.

Here's a picture of my prototype:

The final PCB is a bit different because I made some errors on the first one and used the wrong schematic.
To make it fit in a 1590B the wires to the controls and jacks will need to be soldered to the copperside of the PCB I guess.

DimebuGG · September 27, 2009, 08:36:05 PM

Nice!

But I would recommend for those who want to build this circuit to use a stand alone 500K pot instead of trimmer. IMO, this is much better this way having a lot of tonal options.

served · September 28, 2009, 02:59:18 AM

thats a good thinking. Ill do that.

Mark Hammer · September 28, 2009, 02:44:28 PM

Just so that expectations don't go to inflated, as the original schematic writeup indicates, the intent was not to provide an acoustic "modeller", but rather something that would sound vaguely acoustic if you were required to play rhythm behind someone in a band situation. It does that part well. I would not for one moment expect anyone to sound like Tony Rice or Ricky Skaggs through it.

I am glad that there is confirmation of a viable layout, and some interest in it, though.

Ripthorn · September 28, 2009, 05:29:14 PM

I put together the board for this the other night, still need to get around to doing the offboard wiring. That will have to wait until after the move.

served · September 29, 2009, 03:52:07 AM

Did you build Zetas layout?
If so, ill wait for confirmation, i hope you have time to work with it.

Ripthorn · September 29, 2009, 09:47:08 AM

I'm actually working with Doc's layout. It is a little big, though...

~arph · September 30, 2009, 06:17:04 AM

The Biyang AC-8 follows Mark's original schematic.

Since it uses a simple 9v supply, the opamps are connected to 9V and ground and all ground references (bar the volume control) are replaced with a Vref reference. Constructed by a 10k/10k and 2x 100uF voltage divider. One other difference is on the input stage.
Input pulldown res is 2.2M (orig 1m) and the input cap is 0.1uF (orig 1uf) and the gain resistors used ars are 100k/120k instead of 10k/12k thus keeping the gain the same.

I only played through the unit on my strat and found the sound disappointing and lacking bass reponse. Marks soundclip sounds much better.
And I recall having breadboarded a modified version of Oliver Alex's 9v version once that sounded much better too (the signal only split once. One side was the treble/distortion and the other side was the unaffected signal with a variable active bass boost)

Mark Hammer · September 30, 2009, 08:59:47 AM

Wow, that was fast! Thanks for the confirmation. I know it might sound silly to say so, but there is a certain thrill in being able to say "Hey, I've been pirated by the Chinese!"

Just out of curiosity, what is the 4th control for? I'm guessing that it is simply the gain trimpot moved from the board to the panel, but it might be something else too.

~arph · September 30, 2009, 10:24:12 AM

Yes, top is the gain trimpot..
As I said, the basic circuit is exactly your design. Only adapted for a single supply in the most basic way.

Now I want to make it sound better, I can try converting it to a split supply see if that matters, but first I will increase the input cap to 1uF

served · October 05, 2009, 11:37:46 AM

Hi.

So i rebuilt it. Used Zetas Rev1 version.
I have a problem. The Bottom knob doesnt have any afect. Could some one hav a look at it?
Ill post some sound samples too.

Ben N · October 05, 2009, 01:53:37 PM

Quote from: Mark Hammer on September 30, 2009, 08:59:47 AM
Wow, that was fast! Thanks for the confirmation. I know it might sound silly to say so, but there is a certain thrill in being able to say "Hey, I've been pirated by the Chinese!"

I think you have to sponsor a kiddush, Mark.

Mark Hammer · October 05, 2009, 02:55:56 PM

Maybe, but I'm not so sure that egg rolls go with pickled herring.

served · October 07, 2009, 03:22:21 AM

Hi.

So i recorded a soundclip. I changed Bottom knob to 15K because 100kohm pot range was until 3 o clock and from there it didnt have any affect. Now it works fully.
I dont know if it sounds right. I spent some time with it and made a pretty long recording about 6 minutes. Because you just cant get the point if you listen a recording for 30 sec.
Its up here http://rattalaagrid.ee/Ardi/woody%20rev%20A.mp3 feel free to download it.
I will make pictures also.

zeta55 · October 07, 2009, 05:14:25 AM

Quote from: served on October 07, 2009, 03:22:21 AM
Hi.

So i recorded a soundclip. I changed Bottom knob to 15K because 100kohm pot range was until 3 o clock and from there it didnt have any affect. Now it works fully.
I dont know if it sounds right. I spent some time with it and made a pretty long recording about 6 minutes. Because you just cant get the point if you listen a recording for 30 sec.
Its up here http://rattalaagrid.ee/Ardi/woody%20rev%20A.mp3 feel free to download it.
I will make pictures also.

Just had a look at the schematic, the bottom pot should infact be a 10KA pot, so the 15K you put in there should do better just as you noticed.

I'll listen to your soundsample later today.

/Krister

Mark Hammer · October 07, 2009, 09:29:13 AM

Quote from: served on October 07, 2009, 03:22:21 AM
Hi.

So i recorded a soundclip. I changed Bottom knob to 15K because 100kohm pot range was until 3 o clock and from there it didnt have any affect. Now it works fully.
I dont know if it sounds right. I spent some time with it and made a pretty long recording about 6 minutes. Because you just cant get the point if you listen a recording for 30 sec.
Its up here http://rattalaagrid.ee/Ardi/woody%20rev%20A.mp3 feel free to download it.
I will make pictures also.

Sounds right to me. I would have turned the bass up a bit and the top down, for the purposes of making the recorded version sound a little bit more like an acoustic, but it sounds like it is working the way it should.

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Wich Acoustic Simulator project?