Sorry if this is the wrong forum to post in....however I'm looking to getting into pedal modding, etc...and I'm looking to have this one be my first project. However, I can not find a single thing about this pedal anywhere on the net...except for a review on harmony-central.
A friend of mine gave me the pedal since it stopped working, and I was looking to get it back up and running again and mod it to work for bass..
Has anyone ever heard of this thing? Again, all I could find was that it was made by a now defunct company called Audio Sound Research, designed by Todd Brindell.
If anyone out there could help me out I'd really apreciate it as I don't want to throw this thing out.
Thanks!!
-Jason
This is the right forum. That's a great review, but as you said no other info to be found.
If you discribe the problem(s) and take some detailed pics. (get lots of pics inside) there are a lot of members here that are very good at tracing circuits so I'm sure you can get the help you need resurrecting it.
Hi!
Thanks so much for replying back to me. I'll have to take a few pictures of what the guts are and see if anything makes any sense. Here is a quick review....however this may not make any sense.
I was able to get the pedal to fire back up after I found a loose connection in the step down xfmr, and it worked but only for a min or two. When it was hooked up it really killed the high end tone of the bass...It looks like it's not set up for true by-pass...but even when I direct connect the out to the in, in passive mode(effect out), I still get the tonal problems. I'd say that this is a side issue to my main problem of the effect blowing up.
So I found that there is a secondary voltage supply circuit where it has two NPN tied together with two diodes and then a 5V regulator and then the ouput of the regulator is tied to the VCC of a dual op-amp-TL072. I found the second NPN to be shorted and when I put a new one in, the circuit fired up, but the part got real hot. And there was no output from the effect at all. When checking the 5V regulator in circuit, I was getting 13.5V out!!
A few seconds later, the new NPN died. I've checked a few resistors in the path of the NPN's and they all look good, there are two caps that I'm going to check out next....
I'm just a bit stumped as why the second NPN is blowing up. I realize that I’m leaving a bunch of info out as to how the dual NPN circuit is wired. I think I’ll try and make a crewed schematic of it, and see if it makes sense to any of you.
Thanks,
-Jason