Electronics > Beginners

The "I made this!" thread - Beginners achievements with pride.

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Howardlong:
I'm not a beginner, but my analogue electronics, particularly on control systems, has always been crap for my entire career (several decades), so I consider myself a beginner in that respect.

Today I managed to get the CC/CV working reliably (i.e., stable and not oscillating) on my poor man's 4 quadrant homebrew SMU.

On the other side of the coin, it looks like I blew up my Maynuo M9711 electronic load, by inadvertently stuffing neg 15V into it when my SMU went into oscillation. Still, I guess I won't need it when I have my SMU completed.

Mr.B:
@Howardlong,
Where do you purchase that proto board please?

Howardlong:

--- Quote from: Mr.B on February 25, 2018, 09:30:17 pm ---@Howardlong,
Where do you purchase that proto board please?

--- End quote ---

I get them from Mouser.

http://www.busboard.com/
http://www.busboard.com/surfacemountpcbs

I use the ones with the solid copper ground plane on the underside, but not the plated through ones, I just link to ground with bits of wire through the pre-drilled holes as required. They are an excellent prototyping alternative for higher speed circuits, or designs with sensitive layouts such as this project.

You’re never at a loss to find a ground to clip on your probe ground, anywhere free around the edge will work.

This is the one in the pic http://www.busboard.com/SP3-100x100-G

I also use the 1.27mm pitch boards extensively http://www.busboard.com/SP3T-50x50-G



paulca:
So I finished my first amplifier prototype board today.

It's a fairly fancy little thing, a stereo Baxandall active gain pre-amp.  Active gain in that the pot is on the outer feedback link.

The downside is, it's current hungry and I'm not sure why.  I need to get a good measure of it's current, but the opamps are fairly warm, around 40*C.

BrianHG:
I'm building my 20 year old project, the 'Subwoff'.  I just ordered 10pcbs for 16$usd, including shipping from 'JLCPCB.COM'.


If I get between 5 and 8 people who want PCBs with all parts included for 40$usd plus shipping, I'll buy enough components from Digikey to build them all.  For those who want to build these on their own, all the source files are here:
https://www.eevblog.com/forum/projects/free-subwoofer-audio-processor-project-for-forum-members/

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