Can I use an USB pendrive as MMC card for a digital camera? Answered

A pile of flash drives I gathered inspired me to ask this question. I know you can connect an MMC card to USB socket using a simple adapter. But is it possible to make an "inverted" adapter, that would allow me to use a flash drive as MMC card for my camera? I guess it wouldn't be as simple as etching a MMC-shaped PCB and wiring it to an USB socket, and almost certainly it would require some advanced electronics... The next issue I worry about is writing speed of a pendrive. Would it be sufficient for a camcorder? I was unable to find any ready solution of this problem and I find it strange that nobody has tried it before...

Asked by Kapcaniew 6 years ago  |  last reply 6 years ago


My problem is My MMC burn several time any suggestion?

I built a Tesla Coil,my coil's specification is 5KV NST,2inch Diameter 2ndary coil,10 turn of 4mm copper tube primary and 0.15mfd 2KV capacitor(10KV mmc with 0.030Mfd Capacitance).My MMC burn several time but the coil works fine with Leyden Jar Capacitor .Please Help me!!!!!!

Asked by Bumba Lodh 7 years ago  |  last reply 7 years ago


What is LPCO Mobility Division?

I found this SD acrd adapter, but I can't find its schematic or any other information about it online. Are any of you from this company or at least knowing how to use this device?

Asked by VirtualBoxer 6 years ago  |  last reply 6 years ago


PIC24F FATFS example not compiling?

I have been trying to use the pic24 example that comes with the FATFS library download on MPLAB X, but everytime I go to build the project this appears on the output:  CLEAN SUCCESSFUL (total time: 6s) make -f nbproject/Makefile-default.mk SUBPROJECTS= .build-conf make[1]: Entering directory `C:/Users/Ben/MPLABXProjects/FATFS test.X' make  -f nbproject/Makefile-default.mk dist/default/production/FATFS_test.X.production.hex make[2]: Entering directory `C:/Users/Ben/MPLABXProjects/FATFS test.X' "C:\Program Files (x86)\Microchip\xc16\v1.20\bin\xc16-gcc.exe"   C:/Users/Ben/Documents/FATFS/examples/pic24/ccsbcs.c  -o build/default/production/_ext/2024670909/ccsbcs.o  -c -mcpu=24FJ64GA002  -MMD -MF "build/default/production/_ext/2024670909/ccsbcs.o.d"      -g -omf=elf -mlarge-code -mlarge-data -O0 -msmart-io=1 -Wall -msfr-warn=off make[2]: Leaving directory `C:/Users/Ben/MPLABXProjects/FATFS test.X' make[1]: Leaving directory `C:/Users/Ben/MPLABXProjects/FATFS test.X' make[2]: *** No rule to make target `build/default/production/_ext/2024670909/diskio.o', needed by `dist/default/production/FATFS_test.X.production.hex'.  Stop. make[1]: *** [.build-conf] Error 2 make: *** [.build-impl] Error 2 BUILD FAILED (exit value 2, total time: 5s) There are no visible errors (red underlined sections) in any of the source files, and I have not modified the code from the download. I have checked and the correct device is set under project properties. I am using XC16 v1.23, and I am sure that all the source files that are used have been included.

Asked by Higgs Boson 4 years ago  |  last reply 4 years ago


Cheap and portable >12V >10A PSU for small tesla coil? any good topload sugestions?

I am currently planning a small tesla coil (15 inches high, hopefully 5-12 inch sparks) I would like to make the unit small (desktop size). I decided to build the coil around a ZVS-driven flyback transformer rather than a standard NST or Oil burner transformer due to several advantages the ZVS circuit can offer: battery operation, smaller size, simpler math, no requirement to "match" the capacitance with the transformer, and since I have almost all the parts necessary to build another ZVS driver, why not!? The ZVS driver drive a DC flyback at approximately 15KV, which will then charge a homemade capacitor (I will not invest in a true MMC because it will put stress on the capacitors and connections, not mentioning the price of better quality film capacitors.) I have determined the dielectric breakdown of a few household items (plastic wrap, lids, lunch bags, etc. I assume they are low-density polyethylene) with my ZVS singing arc assumed to be at 8-10KV, and figured one layer of 5x7 inch compressed between 8 layers of plastic wrap gives an approximate capacitance of 0.7nF (sitting flat on a table with a few books to compress the plates closer together) to 1.44nF (after being rolled up very tightly. However, the breakdown voltage of this may be too low. I have yet to test this with my singing arc project)  The Capacitor will be several layers of plastic wrap sandwiched between layers of aluminum foil, which will be cut 3/4 inch shorter on all 4 sides, and after approximately 8-15 layers have been added, the capacitor will be sandwiched between 2 wooden boards with bolts on all 4 sides to permanently compress the capacitor to achieve approximately 10nF +- 5nF. This compression method might even help me fine-tune my tesla coil!  the aluminum plates will be tabbed, so that when they are stacked, the tabs will face opposite directions.  I might even submerge the capacitor in oil and pull a vacuum on it if I feel it will be necessary. However, I have not constructed a HV capacitor before, so I do not know how well this design will work. Does anyone have some experience in this matter? And lastly, my Power supply section to power the project: Has anyone built a ZVS-based tesla coil here? I see them all over youtube, with outputs ranging from millimeters (similar to my slayer exciter project)  to over a foot long! However, they never state what their PSU is rated for, or use 12 Lead Acid batteries, which I feel would be a bit impractical. So my question is: To get the output I desire, how many volts and amps should my power supply be rated for? I am thinking either a 24V 10A Switchmode supply from amazon, with the voltage adjust maxed out, or a 28V 10.8A SMPS, or a cheaper 24V 15A. SMPS. I thought about making a unregulated supply with a large transformer and a high-amperage full-wave bridge rectifier, but this cost more, and I cant be certain on it's quality. Can SMPS be used? can the amperage be below 10A? most importantly, does anyone have good data on current draw @ given voltages @ given # of turns on the inductor and flyback?

Asked by -max- 5 years ago  |  last reply 5 years ago


Tesla Coil MMC

Hello. I am currently trying to build a Tesla coil. However, due to a little mistake my MMC only has about 1/4th of the capacitance required to get it to resonate . Now I wonder what the best course of action would be. add a resistor to reduce the amount of amps to 1/4th of its maximum (6000 volt, 5 mA instead of 6000 volt, 20 mA), and thus the capacity required for resonance (I have a variable resistor here). Or just run it with full power, which would mean it would most likely not function as good as it could (spark gap fires 4 times where it only should fire once) I am currently not capable of adding up extra capacitors to the bank due to a lack of money, but might decide to do this in the furture Help would be appriciated.

Asked by kirdaiht 9 years ago  |  last reply 9 years ago


hi can i use this digital picture frame as a secondary monitor? here's the specs:

Resolution: 480 x 234 Supports JPEG MP2 MP3 WMA AVI VOB Supports SD, MS, MMC Supports USB Flash disk Support Video Output USB Interface Can read up to 32GB capacity of USB Flash drive Can read up to 8GB of SDHC/MS/MMC With 25MB internal memory?

Asked by borge_009 7 years ago  |  last reply 7 years ago


Firewire on Laptop without PCMCIA. Please Help!!?

My laptop has no pcmcia slot.Is there a way to give it firewire support? It does have the following: usb x3 ethernet x1 phone x1 sd/ms/pro/mmc/xd card reader hdmi x1 vga x1 I am trying to hook a SONY DCR-TRV27 camara into Pinical any help with this will be apreciated?

Asked by Eddiepers 9 years ago  |  last reply 9 years ago


Anyone know their PDAs, Internet tablets?

Does anyone know much about modern PDAs or "internet tablets"?Background- like a complete eejit I managed to break the screen on the Guide, so after fuelling my fifteen minutes of internet fame it looks like being relegated to memento status. It occurs to me that for the 80 quid it would cost me to replace the hardware I could probably get a much more recent PDA or similar device and have more adventures with that. I'm not very familiar with this newfangled technology, however: the last PDA I owned before the Guide was a Psion series 3 and I always buy cheapo phones that don't double as internet browsers, games consoles or teasmades. Therefore I could use some help sifting through the wealth of devices available for one that meets my requirements. These, in rough order of importance, are:Browser availableCheap!Competent operating system, preferably Linux, preferably not WindowsExpansion card slot for readily available flash storage (CF, MMC, SD etc)Decent-sized touch screen or decent sized screen and QWERTY keyboardPocket sizedCan interface with a PC (running Linux) relatively easilyIsn't a phone, camera or mp3 playerThe only really important ones are the first four. From what I've seen the Nokia 770 seems to meet most of these. Sadly it only supports 2GB of flash storage on RS-MMC, but I can live with that- it seems small RS-MMC cards are so cheap that I could get several and have a multi-volume encyclopaedia :)Does anyone know any other devices that might fit this description, or can tell me more about the 770?

Posted by PKM 10 years ago  |  last reply 10 years ago


How to power tesla coil? Answered

I asked a similar question https://www.instructables.com/answers/How-to-improve-tesla-coil-/ and I still didn't managed to get a spark. I want the simplest way to build and power this tesla coil  Now I have : -5 layden jars -1 MMC -1 primary 5t -1sec 500t -1 zvs (dc out at 30kv) -1 ignition coil -5 timers -1 MOT -2 capacitors for MOT at 0.98uF -2 diodes for MOT

Asked by theVader75 7 years ago  |  last reply 7 years ago


What Capacitor size for a 4 stack MOT Tesla coil?

I have just bought a 4 stack MOT transformer in a case and oil filled it says 8.6kv on it but no idea of amperage, I have a large variable ballast and hooked it up to my test jacobs ladder and it pulls about 10amp and really fires the ladder well. My coil has a 6inch by 29inch winding on the secondary and a Synchronous spark gap (200bps) but I cant seem to get a decent spark off it I have an MMC of 44.0nF @20kv at the moment 

Asked by GordieO1 2 years ago  |  last reply 2 years ago


Too many electronics sitting around

I have too many electrons sitting around and was wondering what all I could make with them? Heres the list to what I have: a brand new 2wire wireless router 2700hg-b a dead creative zen stone 1gb 2 old digital cameras - 1: sony cyber-shot dsc-p52 - 2: hp photosmart 435 64 mb sd card 16m MMC 4 cellphones - 1:Samsung Qwest SPH-A880 - 2:Sony Ericsson W300i - 3:LG PM225 - 4:Sony Ericsson Z520a (all have batterys not sure if they work though) old xbox 400w power supply usb external floppy drive im sure there is more stuff ill add it in later if I find anything else

Posted by JRauck 10 years ago  |  last reply 10 years ago


Capacitor quick question: (Dissipation factor vs ESR?)

I want a decent small capacitor that is suitable for "high power resonant circuits." On the osciloscope, the waveform looks like 2 well rounded humps, one that is skinny and tall and one shortly following that is shorter but longer, and this is periodic at 30KHz. UPDATE: looking at the waveform closer, it is clearly a damped ringing that is a bit trimmed. The screenshot is uploaded. The maximum measured slew rate was about 25.5MV/S, (which is 25.5V/uS, right?) for a "perfect" 1uF capacitor, that is a peak current of 25.5A! I am unsure of the RMS current due to the non-sinusoidal nature of this waveform. But it must be pretty high as well, explaining why my 3, 1cm diameter 3cm long 0.47uF MMC film capacitors get pretty warm.   . Why do some film capacitor datasheets only give dissipation factor ratings at a few test frequencies (like 10KHz and 100KHz) and others give ESR ratings as well? . Based on what I googled, I figured out dissipation factor is the ratio of ESR to the capacitive reactance. And since the frequency and capacitance is given it is not hard to calculate the ESR. So then why is this not conveniently already listed on the datasheet? Is it because the dissipation factor is what is directly measured? (like the total measured impedance of the capacitor at a certain test frequency)

Asked by -max- 2 years ago  |  last reply 2 years ago


Acer laptop, what mother board does it use?

 I have a acer aspire 5542, And would like to know the mother broad it uses Thanks for your help Brand Acer Model Aspire 5542 Operating system Windows 7 Home Premium 64 Bit Processor / Graphics AMD Athlon II Dual-Core M300 2.00 GHz ATI Mobility Radeon HD 4200 Series Memory 4 GB Dual-Channel DDR2 SDRAM 667 MHz Hard drive SATA 500 GB HDD 5400 rpm Display / Resolution 15.6-inch HD 1366×76 resolution high brightness Acer CineCrystal TFT LCD, 16:9 aspect ratio, 8 ms response time, 60% color gamut Removable Storage 8X DVD-Super Multi double-layer drive Wireless Support Atheros AR5B93 Wireless Network Adapter 802.11 n, b, g Communications Broadcom NetLink Gigabit Ethernet, HDAUDIO Soft Fax Modem with SmartCP, Acer Video Conferencing with Integrated Acer Crystal Eye Webcamer featuring 640×480 resolution, Bluetooth 2.1 Input Devices Full-size keyboard including number pad, Synaptics touchpad with Multi-Gesture support Power 6-cell Li-ion with up to 3 hours of battery life Accessories Extra battery, external USB floppy, extra AC adapter Security software/features Acer Backup Manager1, Acer Bio-Protection1, Acer eRecovery Management, McAfee® Internet Security Suite 2009 Trial, MyWinLocker®, Nortonâ„¢ Online Backup Other Software Acer Arcadeâ„¢ Deluxe featuring Acer CinemaVisionâ„¢ and Acer ClearVisionâ„¢ technologies, Acer Crystal Eye, Acer GridVistaâ„¢, Acer Launch Manager, Adobe® Flash® Player, Adobe® Reader®, EarthLink®1, eSobiâ„¢, Google Toolbarâ„¢, Microsoft® Works with Office Home and Student 2007 Trial, NetZero®, NTI Media Makerâ„¢, Oberon GameZone, WildTangent® Memory card reader Media Card Reader supporting SD, MMC, RS-MMC, MS, MS Pro, xD Accessible memory slots 2 slots Maximum Memory Expansion Up to 4 GB Ports Headphone/speaker/line-out jack with S/PDIF support, Microphone-in jack, Line-In jack, Ethernet (RJ-45) port, Modem (RJ-11) port, DC-in jack for AC adapter Additional Ports None Audio Dolby®-optimized surround sound system with two built-in stereo speakers, Optimized 3rd Generation Dolby Home Theater® audio enhancement, featuring Dolby® Digital Live, Dolby® Pro Logic® IIx, Dolby® Headphone, Dolby® Natural Bass, Dolby® Sound Space Expander, Dolby® Audio Optimization, Dolby® High Frequency Enhancer technologies10, True 5.1-channel surround sound output High-definition audio support S/PDIF (Sony/Philips Digital Interface)11 support for digital speakers, MS-Sound compatible Built-in microphone ENERGY STAR Qualified Energy Star 5.0 Weight 6.16 lbs (2.8 kg) with battery Dimension 15.1 x 9.9 x 1.03 to 1.5 inches, 383 x 250 x 26 to 37 mm Thinness 1.03 to 15 inches, 26 to 37 mm Network Card Broadcom NetLink Gigabit Ethernet, HDAUDIO Soft Fax Modem with SmartCP PC Card Slot None Webcam Acer Crystal Eye Webcamera featuring 640×480 resolution Multimedia and Entertainment Acer Arcadeâ„¢ Deluxe featuring Acer CinemaVisionâ„¢ and Acer ClearVisionâ„¢ technologies, Acer Crystal Eye, Adobe® Flash® Player, NTI Media Makerâ„¢, Oberon GameZone, WildTangent® Warranty Limited 1-year and 90 day warranty options available depending on country, 1-year limited warranty on primary battery. Optional HP Care Pack Services extended warranty

Asked by andreblue 7 years ago