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Hello Everyone,
I am currently interested in JCOP. Does anyone have any idea where to start learning about this ? and where could i get the card ? what reader should i use ?
I used buck converter to convert +48 input to +5 (the plus and minus -48V is switched to +48) to power a microcontroller. suppose i want to use digital input of the microcontroller to detect +5V, i suppose there would be some ground reference problem. should i isolate the input or is there...
What do people usually do when designing circuits with negative voltage input ? for example -48 volts ?. What if a external 5 volts used as digital input signal on these circuits ? How do they make sure they won't be ground reference problem ? for example ground reference for -48 volts and +5...
Did you receive data from server via AT Command ? Isn't the location of the received value depends on the device drivers of the uart/usb ? what do you mean by registers ?
Everytime GSM Module connect to the internet it acquires different IP, so it is a bit hard for GSM Module to act as TCP
Server. The GSM Module could initate the connection first. Send some data. Then without closing connection, let server send some data to the GSM Module. You could use some...
The zener voltage at least has to be bigger than half the input power (2.5V) - led forward voltage and smaller than input power - led forward voltage.
So that if stat pin is high impedance, 5V- 2x2V(LED) = 4V. So 1V left. if zenervoltage > 0.5V, not enough voltage to turn on both leds. And if...
Hi,
at the last schematic that you show, if either input power or battery not present, the stat pin will go to high impedance meaning that both leds will turn on assuming the forward voltage of the led is 0.7V . you could add a zener in series with the input power like shown in my figure to...
Hi brian,
thanks for your reply. do you have some idea what parts of the circuits may be broken ? the tv has been repaired before. The last time the flyback transformator is broken and the tv won't turn on at all. It has been replaced. Do you think the replaced part may be incompatible with the...
I'm sorry, there might have been slight miscommunication with my friend. The problem is not with rs232 line but with 3.3V UART line. here is the schematic
The TVS is written on the schematic. The line is directly connected to Freescale K60 microcontrollers.
Hi iam using bidirectional TVS to protect rs232 line from overvoltage. the voltage breakdown is 16.7V. The problem is rs232 communication isn't working. When i desolder the TVS, the communication is working. Did i pick the wrong TVS ? iam using SMCJ15CA from bourns and the rs232 transceivers is...
Hi, i have a 21" flat screen crt. The problem is the screen is distorted. The left and right side of the screen is curved but the top and bottom side is fine. Are there some ideas what is the problem and how to repair it ?
I am using OV7725 Camera Module from micro4u. I tried to control the module using stm32f407x and displaying it on LCD. I get image data from camera allright, but the image color is off. what supposed to be white turn out green. Any idea where the problem is ? I am using program demo for stm32f1x...
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