Search results

How about the OPA1678? It seems better than the OPA2205 in almost every way, except in input offset voltage at 2V for OPA1678 and 0.25V for the OPA2205 and a considerably higher quiescent current for the OPA1678. If you don't care about that much about the power consumption for a non battery...

I like your process my friend. Very thorough. The noise of a TL072 really is relatively high there. I assume the NEXXXX opamps should not be used as a buffer due to both of their rather low input impedance figures. Where, then, would they be suitable for use in guitar effects? I've seen people...

I'll have a look at that now, thanks! Oooh that sounds very promising (and very interesting). I will have to try that out in addition to a clean buffer. Cheers (y)

Fantastic question - no. I really should. I have a tendency to get ahead of myself =P but it is a BJT fuzz with a low input impedance, so I already know it won't react well to having pedals placed before it. I just had questions about buffers and decided to ask them so that I could learn. If I...

Thanks for the response. I'm looking to add a buffer to an old Knight KG 389 diy-fuzz from the late 60's. Chuck discussed some changes here, which further expanded upon an older post by LucifersTrip on diystompboxes. What exactly am I looking from it? A consistent fuzz sound no matter where in...

I did get a bunch of TLE2072 chips for a much more reasonable price a few years ago. The OPA2992 seems like the more reasonably priced opamp that meets your 'requirements', JTEX. May I ask, how did you get from the ~5k DC resistance thermal noise to the figure of < 10nv/sqrt?

Didn't realise that Didn't realise that there were more calculators on that site. That input impedance and output impedance is impressive on that last one. Personally I don't see any reason not to use it over the single BJT emitter-follower circuit shown on the first calculation I linked (EDIT...

Honestly, for me, SMD is fine even with moderately good, standard soldering tools. No need for an SMD soldering station, hot air gun or solder paste. As long as you have a relatively fine soldering iron tip available, I don't see why anyone can't give it a shot. Thanks for the info (y)

Makes sense. I think. I saw this post on the other cornish thread: Honestly design B there kind of looks tempting. At least for the front end of a circuit. I will have to look into more of what this Douglas Self fella wrote about them.

Looking at the specs sheet of the tl072 I also came to that conclusion when I first started looking into buffers (not that I had the knowledge to really make such an assertive claim to other people - I still don't hahah). What's you're opinion on the TLE2072? Edit: I double checked the...

Don't worry about it (y) maybe I should ask this one on something like the eevblog forum? Electric instrument electronics are at the interesting cross section of general electrical engineering principle and niche, applied knowledge, often learned from the practical side of things. Sometimes it's...

"Okay now plug mains into it."

Yeah but what if you replaced the guitar with a 25Vpp sine wave from a function generator? Checkmate pedal nerds :cool:

Oh wow that thread did get very animated... is it bad to say I want to see the calculations done and empirical evidence shown, or is that just gate keeping a good ol' heated internet discussion :ROFLMAO:

Damn the "Is this already being discussed," popup really isn't that great, is it. I guess at least I'm asking a specific and novel question? Maybe? I should probably just stick to a jfet buffer. Still curious about my questions though :p

That reaction makes me feel like there's hidden Cornish buffer drama 😲

Hello! I was watching a video trying to understand how emitter-follower amps work. In relation to the C-Buffer, there are some things I don't understand - I can't find any model for emitter-followers that include C2, C3, R4 and R7. ( I checked this website and this website) I also wonder...

Haha Chuck strikes again! It feels like the xkcd rule: there's a relevant xkcd post for everything, just as there is a Chuck D. Bones thread for everything pedal related =P

That makes a lot of sense. Thank you. If I have another question I'll create a new thread, like you said, this is getting quite off topic. I certainly do have a habit of, shall we say, enthusiastically following up different lines of inquiry at the drop of hat. Best stick to best practices though.

Brain fart. Typing as fast as you think and not double checking your work is a recipe for mild internet embarrassment. Would the FF be current driven if you had an output impedance of a couple of ohms instead of a couple to a dozen of kilo-ohms? Seems like that would be enough change to make...