Caldo71
Active member
Hey Folks,
So I attempted a build of the Tyrian (probably way too) early on in my indoctrination into this hobby...as many of you may know it has a pretty high component count. I could not get any sounds to come out of it at all and I set it aside for a while.
Eventually I realized how shitty I was (at that point) at soldering, having the right soldering rig, spec'ing my components, TESTING my components, and so-forth. So I recently decided to just start over with a NEW Tyrian PCB, cuz god knows how many fails-on-top-of-fails could have been in that first one. Maybe not worth troubleshooting just now.
Anyhow fast forward to now, and I just finished what I thought was a METICULOUS build of the Tyrian...same exact problem. Damn. You can hear the hiss increase on the output potentiometer as you crank it, but something further up-stream is keeping this thing from putting out literally ANY tones...not even the tiniest little ghost of anything.
I have a few "outside the box" additions to this build—longer cable leads from the pots/jacks for mounting in a rack enclosure, replacing the tone knobs with internal trim pots, etc—that i think I'll start desoldering and reversing to a more traditional build, just to get some of the iffy stuff out of the way so I can be sure they are non-issues.
Components-wise, of course if nothing else comes up I'll have to go back and start counting resistor stripes and so forth on everything, though I rue the day, and am pretty sure I didn't mess that up. Hopefully it's something more basic. And if anyone else has had this issue with the Tyrian and knows a simple answer, I'm all ears.
In the meantime I'd like to kick this troubleshooting off with one newbish question about the TL072 ICs: I have a variety of these laying around, all Texas Instrument branded I believe. MOST of them are marked with "TL072ACP" (the "CP" stands for "charge pump", right?) but SOME of them just say "TL072CP" (no "A") and even OTHERS just say TL072P" (or it might be "IP"...the writing is SO f$%&ing small).
Is there any operational difference between these identifiers, and is it a possibility that me using TL072s with the wrong designation is what is messing up my build?
Sorry for the long post...hopefully the background info is a help.
So I attempted a build of the Tyrian (probably way too) early on in my indoctrination into this hobby...as many of you may know it has a pretty high component count. I could not get any sounds to come out of it at all and I set it aside for a while.
Eventually I realized how shitty I was (at that point) at soldering, having the right soldering rig, spec'ing my components, TESTING my components, and so-forth. So I recently decided to just start over with a NEW Tyrian PCB, cuz god knows how many fails-on-top-of-fails could have been in that first one. Maybe not worth troubleshooting just now.
Anyhow fast forward to now, and I just finished what I thought was a METICULOUS build of the Tyrian...same exact problem. Damn. You can hear the hiss increase on the output potentiometer as you crank it, but something further up-stream is keeping this thing from putting out literally ANY tones...not even the tiniest little ghost of anything.
I have a few "outside the box" additions to this build—longer cable leads from the pots/jacks for mounting in a rack enclosure, replacing the tone knobs with internal trim pots, etc—that i think I'll start desoldering and reversing to a more traditional build, just to get some of the iffy stuff out of the way so I can be sure they are non-issues.
Components-wise, of course if nothing else comes up I'll have to go back and start counting resistor stripes and so forth on everything, though I rue the day, and am pretty sure I didn't mess that up. Hopefully it's something more basic. And if anyone else has had this issue with the Tyrian and knows a simple answer, I'm all ears.
In the meantime I'd like to kick this troubleshooting off with one newbish question about the TL072 ICs: I have a variety of these laying around, all Texas Instrument branded I believe. MOST of them are marked with "TL072ACP" (the "CP" stands for "charge pump", right?) but SOME of them just say "TL072CP" (no "A") and even OTHERS just say TL072P" (or it might be "IP"...the writing is SO f$%&ing small).
Is there any operational difference between these identifiers, and is it a possibility that me using TL072s with the wrong designation is what is messing up my build?
Sorry for the long post...hopefully the background info is a help.