Recent content by Rpschultz13

Just in time for the holidays, Full kit $129 No enclosure $117 Free shipping https://www.q-tune.com/ If you’re interested in the SMD version, PM me.

If anyone’s interested in a fully assembled Q-Tune (fully functional) with one of these SMD prototypes, PM me.

I had NO idea you could get thru-hole assembled like SMD.:cool:

Likely the same price as kit, available in 1590b only.

Not too long ago, I wanted to learn SMDA... and I knew Eagle was EOL soon. I knew KiCad some, but my research suggested that EasyEDA integrated to JLC SMDA so much better. So I went with that, and EasyEDA is SO EASY! 3 weeks in, I had learned EasyEDA, SMD, SMDA and had developed a SMDA version...

The voltage offset puts the center of the signal at the middle of the esp32 ADC, roughly 1.6v. This is very common and necessary when taking an audio signal that centers ant 0 into a computer that is only + voltages. The clipper just protects the ADC from over voltage.

I’ve studied this guys videos, specifically on grounding. Great stuff, very informative:

Hmmm. I suspect any EE will strongly disagree with this method. But I’m not knowledgeable enough to explain why. I’d suggest posing this question over on AAC. (Then report back to us!)

Regarding grounds. I’m no expert. But I’ve been told that a 4 layer board with an inner ground layer and the other 3 with ground planes is FAR superior to a 2 layer board with ground planes. I’ve recently learned how to do this in EasyEDA, it’s practically the same price as a 2 layer at JLC.

Please elaborate

Here was my latest cost for 5 assembled prototypes, just to give an idea on cost. $30 extended fee means I had 10 extended components $3 each. But everything else is so cheap, all the resistors and most of the caps/diodes are basic, literally pennys. They also allow an initial 5 boards but only...

No the 3 electrolytics are extended but still economic not standard. The only thing that tripped me over to standard was assembly on both sides. Initially I wanted the 12-pin JST on the bottom, but it increased the cost a lot. So I found a way to put it on top and keep it economic top side...

I did some digging on trace width. For signals, the default of 0.254mm (0.1") is completely adequate. Even for power that's probably fine. I did some calcs with 150 mA of current on an internal layer (hotter), and it only requires a trace width of 0.05 mm. 150 mA is a lot of current for most...

Op amp wise, the only Basic I found was the TL072. I can't find a basic one for MCP6002, and more strangely, I can't find a basic NE555 timer?!? Oh well. But yes you're right, SOIC-8 is generally best. I'm using the standard footprints that come in EasyEDA. The only footprint I created was for...