Spin Semiconductor

What does the output look like at chip pin and at output buffer? And power rails, are they clean? What are the voltages to the opamp power pins? Do you have caps on the opamp power pins? Chip pin/output buffer is totally clean. If I tap the signal off directly, we have no issues. Yep, buffer has .1...

Clock signal seems fine, no modulation. All my decoupling caps are okay too. Im going to run a signal sweep and see if maybe my filter isnt working, might have too much bandwidth on the output? The weird distortion frequency is pretty low! https://www.youtube.com/watch?v=hV5pOI2JxTo&feature=yout...

OKay, so If I feed it more then 300mv (with just an in-out program), I get strange distortion. I can clearly see where the Fv-1 clips )square waves) and that problem seems fine now. I did another board revision. I will report back with a video.

Okay, so I was finally able to check again. Everything on the scope seems fine.

I have noticed that their is high frequency distortion before the onset of clipping. Im wondering if it might be a decoupling or grounding issue?

frank wrote:Is the clip indicator pin on the FV-1 indicating a clip is happening inside the FV-1?

Yes it is, I accidentally had the LED reversed...

Im thinking my oscillioscope may be having some issues? Im not sure what else could be wrong.

Just tried it with a straight in/out block. I get clipping at 1v peak to peak. Hmmmm

Here is the schematic. Distorts even without no load after R3

And yes....voltages are fine

Hi I am building a board based on the spin refrence schematic. For some reason, I get distortion on my output when it is over .5v peak-to peak. Any ideas where to begin? I am using the refrence schematic with the output tied into no load other than the 1k resistors or the ouput tied into a buffer, I...

It's hard to tell based on your delay patch, which as presented would not make any sound at all. However, if your delay patch has "dry" signal in the output, and you feed this back, you may well get some oscillation. Yeah, I must have copied it wrong because the delay patch works fine, th...

Digital Larry wrote:Looks like your delay patch doesn't really have any delay in it.

I must have exported the wrong patch, or a previous revision, because I know the delay works, the hardware feedback is just strange!

You're feeding back a reverb, it's going to ring. Why are you feeding back a reverb? Quite a few reverbs have a feedback control now. So I wanted to try it. Im well aware that its going to ring at a point, but i is ringing very quickly. Same with the delay. If I do a single quarter note delay, I ca...

Need to see code and schematic to really help. How long a delay are you doing in the FV-1? Cool, Ill post it up. Im not currently doing any filtering on the feedback in he code, probably need to. Here is the code, built in SpinCAD Designer. I using 200ms of predelay in he delay block, and the rever...

Im trying to build a hardware based feedback loop. Im taking an output after the 3.3uf cap and feeding it back in through the 1k resistor on the input. Nothing else is on the circuit. I do not have he 2.2nf or 10k resistors to ground. The circuit certainly works, but even a moderate feedback levels,...