34970A data logger loss of serial port com

Started by legg in sci.electronics.design8 years ago 8 replies

While running a fairly lengthy series of trials, the HP34970A logger started to flash it's front panal display and issue beeps, much as...

While running a fairly lengthy series of trials, the HP34970A logger started to flash it's front panal display and issue beeps, much as it does(but only once) when power is first applied. It wouldn't turn off from the front panel. Recycling from the line cord got the same behavior. Disengaging the interconnecting cartridges/harness from the unit got it behaving normally, so that's someth...


Writing to MCU flash

Started by Phil Hobbs in sci.electronics.design3 years ago 108 replies

So we've got this custom product that includes a voltage-controlled amplifier. VCA chips as used in ultrasound and so on have nice low noise...

So we've got this custom product that includes a voltage-controlled amplifier. VCA chips as used in ultrasound and so on have nice low noise at the highest gains, but at low gain they stink on ice. The same is true of all transconductance-based VCAs unless you use a zillion stages. Sooo, we're faking it with a dpot, an op amp with a mux-controlled resistor ladder, and an LPC804 Cort...


To Indemnify or Not to Indemnify!

Started by rickman in sci.electronics.design6 years ago 7 replies

I'm being prompted to update Adobe Flash Player and made the mistake of trying to look at the license document. It is 304 pages long, written...

I'm being prompted to update Adobe Flash Player and made the mistake of trying to look at the license document. It is 304 pages long, written in an unknown number of languages with no index to tell you which language is where. The first language is 8 pages long, so I assume that is 38 languages. I think this pretty clearly illustrates that not only do they not care if you read this ...


Data write/read and peak detector animation

Started by Tom Del Rosso in sci.electronics.design9 years ago 11 replies

http://www.grc.com/animation.htm Comments? I know, the read head should be magneto-resistive instead of inductive. But should it be...

http://www.grc.com/animation.htm Comments? I know, the read head should be magneto-resistive instead of inductive. But should it be Differential Manchester? The square wave transitions are not encoded like this: http://en.wikipedia.org/wiki/Differential_Manchester_encoding For some people the most interesting thing is that the animation is coded in javascript, with no flash...


Canon PowerShot SX50 HS questions

Started by Skybuck Flying in sci.electronics.design9 years ago 25 replies

1. Minimum write speed for maximum video quality settings ? (Needed to determine which flash card to buy). What is maximum write speed of the...

1. Minimum write speed for maximum video quality settings ? (Needed to determine which flash card to buy). What is maximum write speed of the camera (chip?) ? 2. Which bag(s) are suited for it ? 3. Which tripod(s) are suited for it ? (I am 1m90 and need a long one which can also aim up into the sky, and down towards the floor, and ofcourse turn). 4. Optionally since I will probab...


Are SSDs always rubbish under winXP?

Started by Peter in sci.electronics.design10 years ago 99 replies

I have installed a number of SSDs in desktops (24/7 operation) and all failed within a year or...

I have installed a number of SSDs in desktops (24/7 operation) and all failed within a year or so. Example: http://www.crucial.com/store/partspecs.aspx?IMODULE=CT256M4SSD2 They get replaced under warranty but the result is still rubbish, not to mention hassle, loss of data (we have tape backups but it's still a hassle). It seems that specific files (specific locations in the FLASH) beco...


tiny ARM processor

Started by John Larkin in sci.electronics.design6 years ago 37 replies

I need a really tiny ARM, maybe in a MSOP10 package or something, ideally not a chip-scale thing, which manufacturing and testing hate. I need a...

I need a really tiny ARM, maybe in a MSOP10 package or something, ideally not a chip-scale thing, which manufacturing and testing hate. I need a basic CPU with flash, a couple of ADC channels, a couple of port bits, and SPI or UART. Looks like I need at least 7 pins, maybe 8 with an external ADC reference. I need to put 32 of them on a VME module. Who makes stuff like that these days? ...


Intel Optane Memory

Started by Rick C in sci.electronics.design2 years ago 30 replies

It appears Optane is a type of memory that is faster than Flash and cheaper than DRAM. So the only real use for it is as a cache between the CPU...

It appears Optane is a type of memory that is faster than Flash and cheaper than DRAM. So the only real use for it is as a cache between the CPU bus and mass storage. Because the hard drive interfaces are not designed for low latency devices, it has to be more tightly coupled to the CPU. Seems they (Intel) didn't do a good job of designing chips and boards to take full advantage o


trigger LED

Started by John Larkin in sci.electronics.design2 years ago 41 replies

I'm doing a small box that accepts a user trigger. I'd like to flash an LED every time it gets triggered. Something like 100 ms, on a...

I'm doing a small box that accepts a user trigger. I'd like to flash an LED every time it gets triggered. Something like 100 ms, on a blue LED. The obvious circuit is a 74lvc1G123 one-shot, set to 100 ms pulse width. But how fast will that work? I'd like to go to 50 or maybe 100 MHz. Would it keep retriggering? I wouldn't want the LED to go out at high trigger rates. There is a spec...


Do distributors still program micros?

Started by Phil Hobbs in sci.electronics.design3 years ago 45 replies

Fifteen or so years ago, "value added services" were all the rage among distributors--they'd make cables, or flash micros to order. That...

Fifteen or so years ago, "value added services" were all the rage among distributors--they'd make cables, or flash micros to order. That seems mostly gone. How do you folks get MCUs programmed? Are there still distributors that do that? Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Elect...


Bridge rectifier question

Started by bitrex in sci.electronics.design6 years ago 16 replies

Forgive me, my power supply topology-fu is a little rusty. Still mucking around with my junk box flash capacitor charger. So if I have a...

Forgive me, my power supply topology-fu is a little rusty. Still mucking around with my junk box flash capacitor charger. So if I have a surplus tranny with a 1:12 step up ratio that I'm feeding through a cap with a 10 volt P2P square wave with a +5 volt DC offset, that gives me +5/-5 into the tranny. 1:12 step up ratio plus bridge voltage doubler gives me about 120 volts out if I'm...


Adobe Download Button

Started by amdx in sci.electronics.design9 years ago 9 replies

Hi Guys, Having some video player problems and want to download, Adobe Flash Player 11.6.602.180, but I cannot locate the Download Now...

Hi Guys, Having some video player problems and want to download, Adobe Flash Player 11.6.602.180, but I cannot locate the Download Now Button that is referenced. http://get.adobe.com/flashplayer/ Anyone see a download button? Mikek


Rigol DS1074Z

Started by Hul Tytus in sci.electronics.design6 years ago

sci.electronics.design Rigol DS1074Z scope The DS1074Z is currently recording a sweep of 12 seconds total on 2 channels with the memory...

sci.electronics.design Rigol DS1074Z scope The DS1074Z is currently recording a sweep of 12 seconds total on 2 channels with the memory depth set at 6 million pts. By varying the sweep rate afterwards, the entire 12 seconds can be viewed. If that data is put on a flash card via the Rigol's "external USB storage device" and recalled, or "loaded", the waveform can't be seen. The dat...


Hamming ECC

Started by bitrex in sci.electronics.design3 years ago 11 replies

Do you use Hamming/Reed Solomon/etc. codes to check for data errors when writing/reading e.g. large battery-backed SRAMs or Flash memory that's...

Do you use Hamming/Reed Solomon/etc. codes to check for data errors when writing/reading e.g. large battery-backed SRAMs or Flash memory that's are used for non-volatile storage of user data for significant periods of time (couple weeks)? Or do you find single-bit errors in RAM reads to be not much of an issue in practice? I'm considering writing the external memory in pages of say 8 by...


Nice MCU for small jobs

Started by Phil Hobbs in sci.electronics.design3 years ago 96 replies

LPC804: 15 MHz Cortex M0+, 32kB flash, 4k RAM, 12-bit 2 us ADC with 1 LSB DNL, 10-bit DAC, the usual serial stuff, 20-TSSOP: 67 cents in...

LPC804: 15 MHz Cortex M0+, 32kB flash, 4k RAM, 12-bit 2 us ADC with 1 LSB DNL, 10-bit DAC, the usual serial stuff, 20-TSSOP: 67 cents in reels, dev board $27. We're using it for a super-quiet diode laser controller where it will run the temperature control and automatic power control loops. I'll never use another ATmega. ;) Cheers Phil Hobbs -- Dr Philip C D Hobbs Principa...


Best bang-for-buck uC

Started by bitrex in sci.electronics.design4 years ago 94 replies

IMHO the best bang-for-buck uP available right now is the ATTiny85. Luxurious 8K of program memory, 512 bytes RAM, 512 bytes flash, 4 ADC...

IMHO the best bang-for-buck uP available right now is the ATTiny85. Luxurious 8K of program memory, 512 bytes RAM, 512 bytes flash, 4 ADC channels, 2 hardware PWM outputs, 20 MHz clock @ 5 volts. Under a buck in quantity at Mouser:


Stellaris JTAG problem

Started by Marco Trapanese in sci.electronics.design10 years ago 1 reply

Hello, I have several boards that host LM3S* Stellaris MCU. They are different boards but the connections around the MCUs are the...

Hello, I have several boards that host LM3S* Stellaris MCU. They are different boards but the connections around the MCUs are the same. Some boards work fine and I can program the MCU using JTAG (LMI FTDI). Others don't work - LM Flash Programmer returns error while connecting. I might exclude a design error due to the working boards. Perhaps some problems during soldering. I chec...


2TB upgraded to 32G

Started by Anonymous in sci.electronics.design3 years ago 56 replies

I brought the previous version of this, just trying to figure out the scam. It did not mention 32G before. So, i was gambling $10 on...

I brought the previous version of this, just trying to figure out the scam. It did not mention 32G before. So, i was gambling $10 on 2TB. Now, they say 2TB upgrade with 32GB memory chip. Still not accurate. Actually, 32GB faked as 2TB. Buyer beware. https://www.ebay.com/itm/2TB-Swivel-OTG-USB-2-0-Flash-Drive-Pen-Memory-Stick-Key-Thumb-Storage-U-Disk-RED/303147581728?_trkparms


bare-metal ZYNQ

Started by John Larkin in sci.electronics.design2 years ago 28 replies

Assume I'm a pointy-haired boss trying to help one of my guys. I think that... The Xilinx ZYNQ (FPGA+ARM on a chip) has a hard boot...

Assume I'm a pointy-haired boss trying to help one of my guys. I think that... The Xilinx ZYNQ (FPGA+ARM on a chip) has a hard boot loader. It figures out what the boot device is (serial flash, SD card, whatever) and reads in a secondary boot program, which the Xilinx tools provide as part of a build. That loader then reads the entire FPGA config bitstream into DRAM, and sets up a gi...


Ebay special SATA flash memory drive

Started by bitrex in sci.electronics.design6 years ago 19 replies

So I wonder how well something like this would work for "regular use" before one starts getting write...

So I wonder how well something like this would work for "regular use" before one starts getting write errors: http://www.ebay.com/itm/10-x-Micro-SD-TF-Memory-Card-to-SATA-SSD-A dapter-RAID-Quad-2-5-SATA-Converter-/121818700671?hash=item1c5cf5d b7f:g:xJwAAOSwlV9WTWUL It says it does RAID 0...stick 10 64 gig cards in there? 64 gig cards can be had pretty cheap, I guess I could test ...