I am really having a hard time getting low voltage signals to trigger and smooth on this Digilent. Used to say I could trigger any signal, then they took my knobs away, and these buttons don't work the same,I can't figure how to run a sync cable either. I scrolled through the buffers, added capacitance to ground, scrolled wildly at the trigger numbers, tried syncing on the output, Read through the help files, re-watched what tutorials I could find, and even tried Emailing Digilent's support site.
So what do the pros say? Just where are the waves on my wave coming from? Shouldn't my Input offset voltage/currents and bias currents all remain a constant dc? Could I be getting this much noise through my rails? I am only powering pins 4 &7 of a uA741 with +-12V from an old Heathkit, could this noise be coming from there? Just what are the effects of changing my rail voltage, and what are the datasheet characteristics that apply to pins 7 and 4?
Could this be usb jitter? I know I have a hard time at high frequencies, that is a given limitation, but nothing told me I would hit problems like this at small amplitude.
One more idea I had was to add another op-amp with gain of 1 in series with my signal to cancel out some of the noise. I am pretty sure I could make that work, but this lab is all about studying micro amps in op-amp circuits, and I would bet they would start growing and shrinking exponentially.
So what do the pros say? Just where are the waves on my wave coming from? Shouldn't my Input offset voltage/currents and bias currents all remain a constant dc? Could I be getting this much noise through my rails? I am only powering pins 4 &7 of a uA741 with +-12V from an old Heathkit, could this noise be coming from there? Just what are the effects of changing my rail voltage, and what are the datasheet characteristics that apply to pins 7 and 4?
Could this be usb jitter? I know I have a hard time at high frequencies, that is a given limitation, but nothing told me I would hit problems like this at small amplitude.
One more idea I had was to add another op-amp with gain of 1 in series with my signal to cancel out some of the noise. I am pretty sure I could make that work, but this lab is all about studying micro amps in op-amp circuits, and I would bet they would start growing and shrinking exponentially.