Latest threads in Electronics Designshow only best voted threads
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C0G ceramics vs humidity---I think I have the answer
Follow my logic: The reason a polymer capacitor drifts with a change in humidity is that water is a very polar molecule w/ a dielectric constant of about 80. Polymers are much lower, 2-8 more or less....
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9 years ago
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Estimate of diode laser bandwidth
Hi all, after tribulations with HV opamps and leaky inductors, my diode laser seems to be happy again. Here's a scan of the laser through a Fabry-Perot confocal cavity. (F-P FSR ~ 380 MHz, finesse >...
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9 years ago
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4-20mA signalling
Hi is there any accepted "standard" (or common) way of signalling "null" or "unavailable" or "fault" values? Perhaps a current below 4mA or above 20mA? I am looking for something that a customer can...
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9 years ago
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Are 2N7002s somehow fragile?
I have had two 2N7002 broken for no apparent reason. I used them for shifting logic levels, and thought that they are not very critical (until they stopped working that is). I used 100n capacitors as...
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9 years ago
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C0G ceramics vs humidity
Does anyone have reliable information on the affect of humidity on C0G capacitors? Polypropylene caps will drift about 1/2% from 50 to 90% humidity, polycarb are much worse, maybe 3-4%. I have never...
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9 years ago
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AD SSM 2000: Documentation Eval Board?
Attention: fup2! Dear experts, A "few" years ago Analog Devices launched SSM 2000 "Hush", a noise reduction IC. Together with it they offered an evaluation board of which I have schematic and circuit...
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9 years ago
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faraday cage leakage
I am trying to charge my device in a faraday cage. The cage works well without the cord plugged into the device. When I have it plugged into the charge cord radio waves penetrate the cage. Do the...
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9 years ago
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Radio communications device on I2C
Hello, I'm looking for a device which I can connect to STM32 (the one like here: h ttp:// a_brief/DM00094498.pdf) for radio communications. I want to transmit and re ceive signals, encoded with AX.25....
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9 years ago
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Arbitrary delay in LTspice
Awhile back we were trying to figure out how to make a voltage-variable delay line in LTspice. Turns out there is a way to use one signal to delay another: there's an undocumented function delay(x,y)....
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9 years ago
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pmos and pnp pass transistors
I've been having a hard time getting an op-amp with a pnp and/or pmos series pass transistor to work (I can't get the pnp or pmos to work)... when I say work I really mean to simulate on LTspice. I...
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9 years ago
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Art of Electronics, 3rd edition, corrections
AoE 3rd edition, is shipping from Amazon, I got two copies Sunday (delivered by the USPS). We're eager to hear about errors and typos, so we can put corrections in the next printing, which will go to...
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9 years ago
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SAMSUNG - TV LED 28 Pouces HD
SAMSUNG - TV LED 28 Pouces HD
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9 years ago
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Electron Rotation Symmetry
Many moons ago I learned that electrons needed to rotate 720 degrees before coming back to their starting point. Among other implications, this means that if one constructs an apparatus to measure the...
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9 years ago
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proto boards
I laid out a bunch of test circuits on one 4-layer board. Someone here suggested getting myropcb to fab four of them, so we did that. It took 3 weeks and cost something like $250 for the lot. They...
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9 years ago
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Micro strip capacitor issues and questions
Could some electronics guru please help ? Recently, I came upon some literature related to micro strip inter-digitated capacitors fabricated on single side copper clad FR4. Several questions arose in...
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9 years ago
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