Unanswered Questions
19
votes
1answer
2k views
How do I make the Fairchild FSA9280/FSA9480/FSA880 BOOT pin trigger? (Samsung Galaxy S)
this is a bit of a long shot but I'm hoping someone has access to the full data sheet for one of the chips listed in the title, and can tell me what combination of VBUS_IN and resistors on ID_CON will ...
4
votes
1answer
67 views
PCI obsolescence - IEEE1284 (EPP,ECP,LPT) printer port ASIC
I have a product in volume manufacture where the embedded CPU is now obsolete.
I have to replace that CPU with a lower cost alternative. For political (and practical) reasons I don't have a choice ...
3
votes
1answer
46 views
Arduino-controlled slot cars - alternative to MOSFETs for speed control?
I'm attempting to control the speed of two slot cars in a set using Arduino.
Each car is controlled by a controller with a variable resistor that looks like this:
They're wired in parallel to ...
3
votes
1answer
186 views
Bit Banging a PICAXE 08M2 as an I2C Slave
Only the X2 parts of the PICAXE family support I2C slave compatibility, but I need to have an 08M2 to act as an I2C slave on a board that I have. Unfortunately I don't have the option of changing ...
3
votes
1answer
107 views
Switching Mixers for LO frequency= 4.25Ghz
I want to upconvert a square pulse of 250 Mhz bandwidth(250Mhz is the value of the first zero of the sinc ) to a center frequency of 4.25 Ghz , so that the spread becomes from 4Ghz to 4.5 Ghz.
...
3
votes
1answer
109 views
What do you call the dynamic range of a variable gain amp?
Dynamic range is the ratio of the largest signal a system can process to the noise floor of that system.
If the system has variable gain, though, then you could interpret this two ways:
Fixed gain ...
3
votes
0answers
42 views
Adding third channel to the PIC32 starter kit `DMA chaining and PWM´ example
I just received my PIC32 starter kit, and played with the demos. I have never used any higher-end uCs than the 8-bit PICs.
One of the new things to me in the PIC32 is DMA. The starter kit came with ...
3
votes
1answer
146 views
Corrupt LVDS Display
We are using an Advantech PCM-3363 PC104 board to drive a NLT Technologies NL10276BC13-01C LVDS Display in an embedded device.
While everything works fine usually, the display sometimes is corrupt.
...
3
votes
1answer
143 views
Dual power supply confusing TTL serial?
Sorry for the vague title: I'm a bit of a noob at analogue electronics, more a logic &software guy. Basic problem is I'm sitting at the end of a cable with a USB powered Arduino trying to send ...
3
votes
0answers
269 views
TI LM3S ARM Cortex M3 with USB 3G Modem
I've got a TI LM3S Cortex-M3 Development board with USB host. I've done quite a bit of TCP/IP programming through the Ethernet and using SPI/UART GSM modems, but I was wondering the feasibility of ...
2
votes
1answer
64 views
Soft video encoder for M4
Video encoding is a computationally heavy task. I like to ask, are the video specs that can be managed with a ARM M4 (STM32F4 type CPU) type CPU? Perhaps low frame rate (10fps) and only VGA quality.
2
votes
1answer
44 views
Value of blown resistor in this simple lead acid charger, Please help if you can
I hope someone can help with this very simple circuit, I have traced from the pcb, my electronics theory has really gone out the window, The circuit shown is from a car battery charger and has a 2 ...
2
votes
1answer
33 views
Does RFID interfere with NFC
i have a small question about interference. Do active RFID (860 MHz) interfere with NFC cards (13.56 Mhz) when placed on top of eachother? (NFC above RFID tag for example). Thanks!
2
votes
1answer
84 views
Phase shift of 180 degrees on refection from optically denser medium
Can anyone please provide an intuitive explanation of why phase shift of 180 degrees occurs in the Electric Field of a EM wave,when reflected from an optically denser medium?
I tried searching for it ...
2
votes
2answers
95 views
Replacing analog scope BNC input connectors
I am wondering if it's safe to replace the BNC input connectors on my old Hitachi v-422 scope.
As long as I'm careful and stay away from the CRT etc? Or is there anything else I'm not aware of?
