Design

Radiated vs conducted noise with flyback PS module.
Sanity check please: :) I had some fun recently with a design that used a small isolated flyback module, with large EMI issues. The device in question will pass conducted and radiated emissions at class B, if it is operated by itself with a load resistor, but when placed in a real board, emits all over th... 14 Apr 2010 18:56

USB 3.0 Flash Drive
Do anyone know have the sch. of the above ? Thanks ! townt.com ... 14 Apr 2010 14:27

Polyswitch-like circuit
I'm looking at an existing design that has a polyswitch device to limit our exposure to shorts on a cable. The existing part will hold 0.050A and trip at 0.10A which is right for us, but it's thruhole. All the SMD devices I've seen are 0.150 trip, and they tend to have larger untripped resistance. If I can ... 15 Apr 2010 13:38

Fun decap pix from a cell phone camera
Decapped InGaAs APD/TIA device, ex Terabeam, from eBay: http://electrooptical.net/www/sed/TerabeamCD3109_decap2.jpg I don't have a microscope, so I took this using a 12.5 mm focal length achromat lens attached to my cell phone with some gycol pthalate wax--it came out pretty well! Cheers Phil Hobbs -... 15 Apr 2010 01:34

Push-Pull cross-over distortion ?
Is it possible to reduce crossover distortion on a push-pull buffer in a package where the bases are tied internally? The package I'm talking about is here http://i44.tinypic.com/2rhxo2q.png The input signal is low Hz to 10MHz sine wave from a THS4222. I'm after an output of 10Vpp into 50 ohm. I can't us... 16 Apr 2010 10:34

Will this EMP bomb work?
Basically a circuit consisting of an amalgamation of a Marx circuit to generate the high seed current and an inductor wrapped around an explosively driven armature. http://img651.imageshack.us/img651/3043/empbombj.pdf Some questions I had were: 1) How do I find out the precise time the current through the indu... 17 Apr 2010 16:19

LED Lights and Garage Door Opener???
This may not be appropriate for this site or this section of the site so forgive me in advance if it doesn't belong here. We have a unique problem that for the life of my electronics background, doesn't make sense but its real and strange at the same time... and it's driving us bonkers! I have two garage door opene... 23 Apr 2010 17:56

memristors
HP found a way to make memristors http://spectrum.ieee.org/semiconductors/design/the-mysterious-memristor and I'm trying to make heads or tails of them. If they came in 0805 packages and you could buy them from digi-key, how would you spec them? They say it has the units of ohms but if its a constant its just ... 20 Apr 2010 16:19

Simulating a variable resistance input with LTSpice?
Hello Folks, Got stuck when trying to simulate an NTC. This temperature-variant resistor will be the only variable input so ".STEP" and stuff do not cut it because that only overlays multiple curve in an AC or DC simulation. I want just one curve: Output of my circuit versus varying NTC resistor value. Tr... 23 Apr 2010 21:25

unexpected delay in a TWT
Since we were having a long delay in a system I came to measure the delay of a traveling wave tube (TWT) amplifier. The delay is in the order of 40ns, which at 34.6GHz correspond to about 1380 wavelengths or 13m of free space. The tube is in the order of 30cm long. I was aware it has two helix inside but consider... 20 Apr 2010 16:17