Bwahahahahaha!

Started by Jim Thompson in sci.electronics.design2 months ago 340 replies

"But would it be safe? Hyperloop Transportation Technologies says that unlike train and air travel, there's no chance for human error...

"But would it be safe? Hyperloop Transportation Technologies says that unlike train and air travel, there's no chance for human error with the Hyperloop because it would be a closed system completely managed by __computer__." Bwahahahahaha! ...Jim Thompson -- | James E.Thompson |


Question regarding 78xx series devices

Started by Anonymous in sci.electronics.design2 months ago 18 replies

Could some electronics guru please clarify thhe following ? For the 78xx series voltage regulators, does the ground pin have to be ground(zero)...

Could some electronics guru please clarify thhe following ? For the 78xx series voltage regulators, does the ground pin have to be ground(zero) always ? To be more specific, I have successfully used the following setup: Step down(9 - 0 -9) xfrmr -> bridge rectifier -> positive output of bridge rectifier connected to pin 1 of a 7805 and the negative output of the bridgerectifier connected t


OT: Step drill bits

Started by bitrex in sci.electronics.design2 months ago 12 replies

I used to own a "unibit" or step drill bit years ago, but I fear it got lost in one of my moves. I went to Home Depot and they want like 55...

I used to own a "unibit" or step drill bit years ago, but I fear it got lost in one of my moves. I went to Home Depot and they want like 55 bucks for one of them. I need to drill some holes for 9 pin tube sockets in a fairly thin aluminum chassis - I know little about metalwork. Are there any cheapskate solutions available? -- ----Android NewsGroup Reader---- http://usenet.si...


Shenzen

Started by Anonymous in sci.electronics.design2 months ago 98 replies

This is interesting for those who use Ebay or certain other parts sources... Low cost chip processing for fun and...

This is interesting for those who use Ebay or certain other parts sources... Low cost chip processing for fun and profit... http://rube.asq.org/asd/2009/03/compliance/counterfeit-parts.pdf Steve


Op-Amp spec for full wave rectifier

Started by Fibo in sci.electronics.design2 months ago 4 replies

I built up a full wave rectifier and peak detector circuit the other day, it used 4 Op-Amps, and with when I used the LF411 Op-Amp, it worked...

I built up a full wave rectifier and peak detector circuit the other day, it used 4 Op-Amps, and with when I used the LF411 Op-Amp, it worked fine, but I switched to the OPA820 and I couldn't get the full wave rectifier to work... the first stage op-amp worked ok, but once I hooked up the second op-amp, my output disapeared and the thing started oscillating at like 14MHz (the input


Keithley 610C repair

Started by RBlack in sci.electronics.design2 months ago 21 replies

(following on from the discussion of leaky DIP sockets) I could really do with an instrument which measures down at the picoamp level or...

(following on from the discussion of leaky DIP sockets) I could really do with an instrument which measures down at the picoamp level or lower. The Keithley 610C seems to be highly regarded around here, but they very rarely come up for sale here in the UK. Keithley's equivalent current model, the 6517B, is $8K, and from what I hear Keithley's build quality isn't what it once was... ...


Software for differential input LPF design

Started by bitrex in sci.electronics.design2 months ago

Is there any free software package available that can assist in designing differential input 2 or 4 pole low pass/band pass filters? Can...

Is there any free software package available that can assist in designing differential input 2 or 4 pole low pass/band pass filters? Can TI's FilterPro do it? -- ----Android NewsGroup Reader---- http://usenet.sinaapp.com/


Audio transformer as step up transformer

Started by bitrex in sci.electronics.design2 months ago 12 replies

I have a few little PCB mount audio impedance matching transformers, the impedance transformation given on the bag is 500 to 4...

I have a few little PCB mount audio impedance matching transformers, the impedance transformation given on the bag is 500 to 4 ohms. Would these work OK in reverse to step low voltage up to high voltage at a few mA output current and maybe 30 kHz? Efficiency not terribly important... -- ----Android NewsGroup Reader---- http://usenet.sinaapp.com/


Rigol DS1054Z

Started by Hul Tytus in sci.electronics.design2 months ago 2 replies

Anyone had any experience with a Rigol DS1054Z or 74Z? The advertising claims 12 million memory points, which is attractive, unless they mean 12...

Anyone had any experience with a Rigol DS1054Z or 74Z? The advertising claims 12 million memory points, which is attractive, unless they mean 12 million memory bits. Hul


Socket Adapter ??

Started by Jim Thompson in sci.electronics.design2 months ago 19 replies

Is there an adapter available to convert from this POS CCFL: to a conventional base, or perhaps min-candelabra? ...

Is there an adapter available to convert from this POS CCFL: to a conventional base, or perhaps min-candelabra? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal


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