March 30, 2009
News - Why You Should De-Rate Ca…
about 4 months ago
This happened to me and a projectile capacitor piece broke my skin.
As a result, electrolytic capacitors cannot be used to couple AC signals.
This is wrong. Electrolytic capacitors are used to couple AC signals all the time. In a coupling application, the capacitor has 0 V across it, so there is no way it can become reverse-biased. Both sides of the capacitor are moving up and down in voltage at the same time, so the voltage across the capacitor is close to 0 V, even while the voltage of the capacitor relative to ground swings all over the place. https://en.wikipedia.org/wiki/Capacitive_coupling http://sound.westhost.com/articles/capacitors.htm
Also, electrolytic capacitors can withstand small negative voltages without harm. You have to get above about 1 V reverse bias and leave it there for a while before the cap gets damaged. https://en.wikipedia.org/wiki/Electrolytic_capacitor#Reverse_voltage
Of course if there’s a DC bias in your circuit you need to make sure the electrolytic cap is in the right orientation, but they work fine with 0 V bias too, as long as the frequencies are in the range where there is minimal voltage across the cap.
it’s identical to a wire, but with the same body as a resistor so it can be grabbed by a machine. there’s no reason to include them in this kit meant for hobbyists. just use a wire.
yes, though ceramic or film caps that would be used in exact values in filters, not electrolytics
They can grab a single SOIC pin, but the plastic head is so big you can only probe one at a time, not 2 adjacent ones.
“25 each”? Should be a lot more 10 kΩ and 100 kΩ than other values, since you use those a lot more.
Can this easily interface with I²S audio CODECs and use its single-cycle MAC to do basic DSP processing? If not, what board should I use for that?
about 2 years ago
Are the waveforms band-limited/anti-aliased?
about 2 years ago
I always worry about breathing in lead dust while using these. It’s basically an atomizer spray for liquid lead. Am I just paranoid?
News - Pit of Despair
about 3 years ago
“We need a good system (forum, FAQ, knowledge DB, etc.) to congregrate all the group intelligence in a useful way.”
Please please please please please!
Not a forum. Not an FAQ. The world needs a collaborative design website. You post your project idea and then ask for help from people with different qualifications. “Project title: I have this idea for a project and I’ve designed all the electronics, but I need help from a mechanical engineer”. Each project has a wiki/discussion board for planning and exchanging ideas. Schematics, blueprints, mechanical drawings can be drawn and edited directly on the site like circuitlab.com or upverter.com. Maybe a graphical roadmap planning tool. Everything collected together in a repository revision control system so you can see who made what changes to the schematic and fork a project to create your own related project. all the files open source (or private for pay, like github)
There are lots of tools for collaborative design of software, but none that I know of for hardware. Whoever makes one please let me know. :D
No public wish lists :(
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