@djsundog Would I be correct that you've got some experience with analog audio electronics?
@beadsland a bit here and there...sup?
@djsundog The electronics guru at our makerspace has found himself thwarted when trying to help recent visitors working on analog projects. Seems knowledge of op amps is hard to come by these days. (He's more the FPGA generation.) I suggested we needed to extend our collective network of subject matter experts to draw on next time someone came in with such a project.
So, of course, I thought of you. Mind if I fly a recent visitor's project problem description by you to see what you think of it?
"I don’t remember the details, but: it’s supposed to be a sine wave on the output. Or was it a square wave? And it’s … very much not, a totally different shape Still periodic, correct frequency
"Looked more like an ECG
There was nothing totally surprising about it, it was wrong in an expected way
But we had no idea where to start - does the op amp not have fast enough rise time
Is the op amp circuit not suitable to this frequency Are we hitting the rails"
@beadsland @vertigo @djsundog The Op Amp certainly could be an issue. Slew rates and what not are always published. But you're dealing with such high frequencies there are probably special problems that arise that are unique to that domain. I work in audio frequencies so I'm a bit out of my league here. Someone must know out there somewhere in the Fediverse!
Any recommendations on resources for checking/diagnosing slew rates, to help a beginner avoid missing any obvious steps in the process? Or, alternatively, expend time unproductively on puzzling out diagnostic steps they don't clearly understand?
The fellow I'm posting this electronics problem on behalf of is wondering if we wouldn't benefit from using Discourse rather than Slack, to get better threading. I'd rather an ActivityPub solution that supports long-lived threads but also federates like Mastodon to allow inter-forum crossover.
maybe look amongst circuit design for the 160 metre amateur radio band, and/or MF/AM broadcast radio - this is in the frequency range this project is dealing with.
I'm not sure if the average op-amps will work reliably at that rate - before Radio Caroline got their licence I was considering building a small AM transmitter to use with my old transistor radios and found it was a lot more complex than I'd expected..
"I’m sure the person who can help would like to look at the waveform and might instantly know what the problem is, and I wish I had kept a picture he sent."
I'm asking if there was a schematic. This is a problem brought into our space a month or so back, so information may be sketchy. But am posting here in the hope to find third pair of eyes to tag in when in the future a visitor arrives with a similar problem. So thanks for chiming in!
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!