Xenon strobe

Started by Mike in sci.electronics.design10 years ago 4 replies

Hi Does anyone know how to build a xenon strobe so that it has a very tight flash to flash repeatability. I have a circuit with which the...

Hi Does anyone know how to build a xenon strobe so that it has a very tight flash to flash repeatability. I have a circuit with which the frequency is only 1 flash per second at about 0.35 Joules (6.6uf and 325v), but I am getting a significant (12%) flash to flash brightness change. The supply voltage (325v) is from a DC DC converter and is very stable. Any comments would be greatl...


led Flash unit single flash

Started by Adam Blake in sci.electronics.design7 years ago 11 replies

what would be the best way to modify a "40 LED Bicycle Light". (http://www.qsl.net/yo5ofh/hobby%20circuits/led_circuits.htm) to make it flash...

what would be the best way to modify a "40 LED Bicycle Light". (http://www.qsl.net/yo5ofh/hobby%20circuits/led_circuits.htm) to make it flash only once instead of repeating the flash? Thnaks


Testing Flash Memory Question

Started by panfilero in sci.electronics.design9 years ago 11 replies

I am purchasing a Nand-Flash memory chip.... just stand alone only flash... not a microcontroller or anything. I was wondering if anyone knew...

I am purchasing a Nand-Flash memory chip.... just stand alone only flash... not a microcontroller or anything. I was wondering if anyone knew of any interfaces or test boards (maybe they are called flash controllers? I'm not sure) that I could use to test the memory... basically I will write a little code to read and write, and then check that the memory is ok. So far I have found this: ht...


Camera Flash

Started by BeeJ in sci.electronics.design5 years ago 6 replies

I have two Nikon camera flash units that are old but working fine. SB-24 SB-20 Need help with 1) flash shoe pinout functions? i.e. how...

I have two Nikon camera flash units that are old but working fine. SB-24 SB-20 Need help with 1) flash shoe pinout functions? i.e. how to trigger manually through the falsh shoe? 2) how to open the units without damage to clean interior dust? 3) compatibility with Canon EOS Rebel series cameras? i.e. will not damage either if attached/used? will flash on camera shutt...


FLASH market collapses

Started by Jan Panteltje in sci.electronics.design9 years ago 60 replies

Apart from the fact that I can buy an 8GB USB stick here now for < 20Euro, there are news items that point to an over production of FLASH...

Apart from the fact that I can buy an 8GB USB stick here now for < 20Euro, there are news items that point to an over production of FLASH memory, and losses for Sandisk for example, and them reducing investment in new factories to prevent further over production. So if you need FLASH then you should be able to negotiate a good price.


Multiple Masters on SPI

Started by sms in sci.electronics.design4 years ago 11 replies

I'm working on a design where a Cortex M3 writes data to an SPI Flash memory. The issue is that I have a data acquisition device that also...

I'm working on a design where a Cortex M3 writes data to an SPI Flash memory. The issue is that I have a data acquisition device that also needs to read the SPI Flash. Both devices can only be SPI masters. The UART on the Cortex M3 is being used for something else and I2C is too slow. Essentially we're trying to make the SPI Flash into a dual-port SPI Flash with external logic. In sea...


Almost dumped the 4G Junk Flash

Started by Anonymous in sci.electronics.design6 months ago 31 replies

I usually dump these junk mails, but something fell out of it. I almost missed it, but it's a 4G USB flash drive. I guess flash is cheaper than...

I usually dump these junk mails, but something fell out of it. I almost missed it, but it's a 4G USB flash drive. I guess flash is cheaper than paper now. The drive costs me several grands, but better than the paper cert. Looking around to buy a few shares of other BK stocks.


Suggestions please

Started by UKoncology in sci.electronics.design8 years ago 6 replies

Gentlemen, I am trying to build, for hobbyist purposes, a circuit which would meet the following requirements: -It would drive a luxeon LED 3W...

Gentlemen, I am trying to build, for hobbyist purposes, a circuit which would meet the following requirements: -It would drive a luxeon LED 3W continuously, with variable brightness. -It would also operate the same LED in a single flash mode, with external triggering by a flash slave trigger. Ideally the flash duration should be variable within a range of uSec to a few mSec, but a fixed fla...


Modding a Vivitar flash unit

Started by Peabody in sci.electronics.design6 years ago 10 replies

Well this isn't exactly "design" but I figured someone here would know. I have a Vivitar Zoom Thyristor 3500 flash with a DM/C module at...

Well this isn't exactly "design" but I figured someone here would know. I have a Vivitar Zoom Thyristor 3500 flash with a DM/C module at the bottom. Circa 1981 per the copyrights. The problem is that in Manual mode you always get full power, and what I need for off-camera "strobist" work is the ability to set the power to Full, 1/2, 1/4, 1/8,...,1/64 power. From the way the flash...


How to reformat usb flash drive?

Started by Bill Bowden in sci.electronics.design6 years ago 15 replies

I have a 1gig flash drive with some software "U3 system" installed. All the files are read only and can't be deleted, and I get an error if I...

I have a 1gig flash drive with some software "U3 system" installed. All the files are read only and can't be deleted, and I get an error if I try to change the attributes to archive. The format option is not available. There are 3 files listed as Autorun.inf, LaunchPad.zip, and LaunchU3.exe with no free space remaining. Anybody know how to dump the files and reformat as a regular flash dis...


320F2811/2812 use part of the program flash as a data flash

Started by mook johnson in sci.electronics.design7 years ago 9 replies

Can the a section of the program flash be written to, by the embedded code, for storing things like calibration data that would are loaded...

Can the a section of the program flash be written to, by the embedded code, for storing things like calibration data that would are loaded serially once the device is in service? I need these to be loaded via the SCI or SPI and written to internal non-volatile memory. These valued may change over the life of the device so the OTP is not a clean option. It can be done of that is the onl...


DFT Tutorial

Started by Anonymous in sci.electronics.design9 years ago 3 replies

Hi, I have created a flash tutorial program to illustrate the Discrete Fourier Transform. It is...

Hi, I have created a flash tutorial program to illustrate the Discrete Fourier Transform. It is located: http://www.fourier-series.com/fourierseries2/DFT_tutorial.html It allows you to draw a function and then use the flash program to calculate a 16 point DFT on the function you created. There is also a flash program that helps illuminate the basis functions used in the D...


compact-flash/ide adapter

Started by Hul Tytus in sci.electronics.design5 years ago 6 replies

sci.electronics.design compact-flash/ide adapter A compact-flash/ide adapter (SD-CF-IDE-A) from dealextreme.com worked well but only as a...

sci.electronics.design compact-flash/ide adapter A compact-flash/ide adapter (SD-CF-IDE-A) from dealextreme.com worked well but only as a master, not as a slave, which is a distinct bother. Anyone know of an ide adapter that works either way, either from dealextreme or another dealer? Hul


OT: So, have you tried to get your daily dose of Dilbert?

Started by JeffM in sci.electronics.design9 years ago 6 replies

The site now requires Flash to even get in. If you enable Flash and REGISTER, you can leave a comment. The coverage at Slashdot included this...

The site now requires Flash to even get in. If you enable Flash and REGISTER, you can leave a comment. The coverage at Slashdot included this gem: http://entertainment.slashdot.org/article.pl?sid=08/04/19/1842208&threshold=5&mode=nested#231293 82 If you surf with JavaScript disabled, insert &no_d2=1 into the link


Xenon flash tube

Started by bitrex in sci.electronics.design2 years ago 42 replies

I got several of these xenon flash tubes down at Rat Shack on sale for less than 2 bucks...

I got several of these xenon flash tubes down at Rat Shack on sale for less than 2 bucks each. http://www.radioshack.com/long-life-xenon-strobe-tube/2721145.html Anyone have a design for a junk box circuit that could be used for experimenting with these, say firing them from a TTL logic output?


NAND Flash Datasheets needed...

Started by Brane2 in sci.electronics.design8 years ago 11 replies

I want to start a project using NAND Flash ( like the chips in USB- keys, Smartmedia cards etc) but I can't find any datasheets with programming...

I want to start a project using NAND Flash ( like the chips in USB- keys, Smartmedia cards etc) but I can't find any datasheets with programming and reading protocols anywhere. All manufacturers I could find would list just chip models etc, without any actual in-depth documentation. Is there a way to get to this stuff ?


"Safe" way of running Flash under Firefox

Started by Don Y in sci.electronics.design3 years ago 16 replies

Hi, I tend NOT to install Flash on outward facing machines just to eliminate one more set of bugs, opportunity for advertisers, cookie jar,...

Hi, I tend NOT to install Flash on outward facing machines just to eliminate one more set of bugs, opportunity for advertisers, cookie jar, etc. SWMBO has been increasingly grumbling about not being able to view the (silly) videos her friends send her way. (sigh) So, I'm looking for options on "safe" ways to provide her with that without adding to the amount of maintenance I have to ...


USB Flash Drive to xD

Started by Mike Warren in sci.electronics.design7 years ago 6 replies

I have started thinking about a hobby project I'd like to do. I want to create a board to adapt a device that reads and writes xD cards so it...

I have started thinking about a hobby project I'd like to do. I want to create a board to adapt a device that reads and writes xD cards so it will be able to use USB flash drives. The plan is to use a small uC and make one end a USB host and the other pretend to be a xD card, but I have a couple of obstacles to overcome. 1/ I can't find any information on the xD electrical or data spec....


Flash ADC encoder logic equations

Started by Daku in sci.electronics.design6 years ago 9 replies

Could some DSP or electronics guru please direct me ? I am trying to get hold of a typical (some standard number of resolution bits) flash ADC...

Could some DSP or electronics guru please direct me ? I am trying to get hold of a typical (some standard number of resolution bits) flash ADC encoder logic equations. Any hints, pointers would be very valuable. Thanks in advance for your help.


Flash ADC question

Started by Daku in sci.electronics.design6 years ago 5 replies

Could some electronics guru please help ? In a flash ADC, there is a resistor chain, whose voltages at each node are the reference voltages for...

Could some electronics guru please help ? In a flash ADC, there is a resistor chain, whose voltages at each node are the reference voltages for the quantization levels. So, let us suppose that I want to digitize a sine wave, with +ve and -ve lobes - in this case how is the polarity of the reference voltages going to change, with each zero crossing ? In commercial designs, is there a togg...