OT black hole pic.

Started by George Herold in sci.electronics.design3 days ago 100 replies

My son shared this video by Vertasium on the black hole pic, https://www.youtube.com/watch?v=zUyH3XhpLTo I thought it was nice. and...

My son shared this video by Vertasium on the black hole pic, https://www.youtube.com/watch?v=zUyH3XhpLTo I thought it was nice. and this, https://www.youtube.com/watch?v=S_GVbuddri8 Amazing stuff. George H.


Little Cap Plugs

Started by Martin Riddle in sci.electronics.design4 days ago 6 replies

I am looking for small square or oval cap plugs or Tube caps. The smallest I've come across is 1" x 1.5", and they are deep. I need...

I am looking for small square or oval cap plugs or Tube caps. The smallest I've come across is 1" x 1.5", and they are deep. I need something shallow and 1" x 0.25" It will be an access port for a SD Card. Any ideas? Thanks


Carving tool for pcb's

Started by Carl in sci.electronics.design4 days ago 27 replies

I was surfing YouTube and found a video on ultrasonic cutters, which I'd never noticed before. Small ones, 20 W or so, are available for about...

I was surfing YouTube and found a video on ultrasonic cutters, which I'd never noticed before. Small ones, 20 W or so, are available for about $300-400 on eBay and seem to do a fine job on thin paper, plastics, rubber, etc. A couple of videos show cutting traces on pcb's but I'm not sure what the wattage is on them. Anyway, I wonder if one of these would be better than a simple razor ...


Testing Idss of fet and not getting what I hoped for

Started by amdx in sci.electronics.design4 days ago 84 replies

I need to sort some 2sk117 BL Fets that I got from China. (just to say maybe they aren't as marked) The marking is K117 BL OK Toshiba spec...

I need to sort some 2sk117 BL Fets that I got from China. (just to say maybe they aren't as marked) The marking is K117 BL OK Toshiba spec says, Idss with VDS=10V VGS=0V 6~14Ma I'm sorting for an Idss of 7ma. So I have the data sheet check the pin out and short Gate to the Source, put a milliamp meter on the drain and connect the other side of the milliamp meter to the power suppl...


microstrip vs. coplanar?

Started by Ivan Shmakov in sci.electronics.design4 days ago 3 replies

Do I understand it correctly that one of the advantages of (conductor-backed) coplanar waveguide over microstrip is the possibility of making...

Do I understand it correctly that one of the advantages of (conductor-backed) coplanar waveguide over microstrip is the possibility of making (with a suitable gap) the former narrower than the latter, all other things being equal? (Which is to say, R _c, dielectric thickness and \epsilon _r.) What'd be the disadvantages? (Other than the need for a lot of vias along the trace and t...


illegal alien invasion of San Francisco

Started by John Larkin in sci.electronics.design4 days ago 22 replies

https://www.dropbox.com/s/0ygw4leikb6fmsz/Illegal_Alien_Glen_Park.jpg?dl=0 That's a wild turkey. The coyotes, skunks, raccoons,...

https://www.dropbox.com/s/0ygw4leikb6fmsz/Illegal_Alien_Glen_Park.jpg?dl=0 That's a wild turkey. The coyotes, skunks, raccoons, wildcats, seagulls, snakes, and possum were bad enough. What next? Grizzly bears? Tattooed mice? -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtech...


transmission line Colpitts oscillator

Started by John Larkin in sci.electronics.design4 days ago 12 replies

I've been thinking about this https://www.dropbox.com/s/yuu737wb3cqizph/TX_Line_Osc_3.JPG?dl=0 as a roughly 500 MHz clock oscillator for...

I've been thinking about this https://www.dropbox.com/s/yuu737wb3cqizph/TX_Line_Osc_3.JPG?dl=0 as a roughly 500 MHz clock oscillator for some digital stuff. My FPGA guys claim they can accept that as an LVDS clock input. The comparator would be LVDS in and out, FAN1101 maybe, if it is really fast enough. So I have a question for some more RF-ey guys than me. Q1 furnishes negative r...


Freelance sites (lol!)

Started by bitrex in sci.electronics.design5 days ago 27 replies

A solicitation for the design a pulse-detector which has to measure the precise duration of high intensity visible light flashes on the order of...

A solicitation for the design a pulse-detector which has to measure the precise duration of high intensity visible light flashes on the order of 10 nanoseconds, plus digitally record flash intensity during the pulse - "using Arduino." and constructible using only off-the-shelf components commonly available for purchase in Pakistan. Budget: $50


How to find ASIC design houses?

Started by Joerg in sci.electronics.design5 days ago 46 replies

Got a client where we will eventually need to pour our stuff into an ASIC. Mostly analog along with some serial port glue logic. Afraid that...

Got a client where we will eventually need to pour our stuff into an ASIC. Mostly analog along with some serial port glue logic. Afraid that Jim isn't with us anymore so how does one find a preferably local ASIC design services provider in the greater Sacramento area, California? Someone who sees it through from the design to production. All the lists I have seen aren't very useful beca...


Common collector amplifier and amplitude modulation

Started by Anonymous in sci.electronics.design6 days ago 20 replies

Could some electronics guru here shed some light on this Could a single stage common collector amplifier exhibit amplitude modulation ? I have...

Could some electronics guru here shed some light on this Could a single stage common collector amplifier exhibit amplitude modulation ? I have the SPICE model of a simple common collector amplifier consisting of two base bias resistors, a collector resistor and an input and a output DC blocking capacitor, as well as a source and a load resistor of 50.0 Ohm. The BJT collector is connected to ...


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