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Thanks for reply, but it's absolutely BAD. SIM900 need 3.6 - 4.2V (as LiIon voltage). I need small design, without any transoformers, etc.
I need power supply circuit for use SIM900 with 24VAC or 12VDC supply. Catalog circuit of LM2576 is ideal for 12-40V supply, but it is for DC voltage. My...
Hi boys,
please, can you help me? I need create design of power supply for GSM module SIM900. I found some catalog schematic of LM2576 ADJ as STEP DOWN from 12VDC to 4VDC. It's ok, but I need step down converter from 24V AC. Is good idea to use catalog circuit with diode bridge in input? Which...
Many thanks for reply.
No, I don´t know any HDL language, I know only ASM and C languages... But I have downloaded logic function schematic of this application solution from google. Is it possible to "click" this logic schematic in CPLD IDE? I found XILINX webpack, is it good for my idea?
I...
Hi boys,
please can you help me?
I need switch two SD cards for two MCUs. Only 1 SD to 1 MCU at one time. So I need 2 or 4 pins as selector. Select one of two SD and select one of two processors.
It will be bus selector, or bus switch if you want.
SD card have 6bits of bus. Can I use CPLD for...
Hi all,
please, do you have some experience with cheap chinese reflow oven T-962 ?
I found some informations about poor quality, poor thermal power - in specifications have oven 800 W of power, but measured parameters is some about 300W etc...
This informations are everything from 2009 and...
Hi boys,
I need LDO IC to my new design, for SIM900 GSM module supply. LM317 is poor, so I found LM1085. I need DPAK - TO252 package, but local supplier dosn´t have it. Price on farnell is very high. I need LDO IC with input voltage min 16V and adjustable (4V) output with 2-3A peak current in...
Hi boys,
today I make design for my new product. We use SIMCOM SIM900D in our company, but we have very problems with this. Every firmware version have another errors, new modules manufactured (2011-2012) freezes for every 14 days in our applications, etc.
So I did a research and I find Qurctel...
Many thanks.
Yes, I need optocoupler alternative. I don´t need isolation, but good immunity for interference. I have some good experience with connection this cables directly to IO pin of MCU. This direct connection can give interference to MCU and this will reset, etc. For this reason I Looking...
HI boys,
please, can you help me?
To this day I use optocoupler PC817 to interfacing atmel or pic input with other devices - switches, relay contacts, etc.
Now I make redesign of pcb and need smaller size. pc817 is very big. I need some another circuit such as transistor, zener diodes etc...
Thanks, It´s nice, but this is only GUI for Avrdude ? :-) I need some specific, which not will be arduino named for first look. My customer don´t know arduino and I need mask it.
For second question - my idea is some little code in bootloader, which will be specific for only this one...
Hi boys,
please, can you help me with my problem? I make some project on arduino and I need send testing firmwares to my customer. But I don't want send arduino IDE. Is possible upload firmware from arduino IDE to atmega328 with some special loader for windows?
Is possible encrypt this firmware...
I´m sorry for not good description of my problem...
Now I attach schematic of my idea. Aku will be Sealed Lead 12V 1,3Ah. I need about 6 hour backup - device have consumption about 50-200mA / 12V. This will be professional circuit so I need fabrication design - not notebook adapter, wall...
Hi boys,
plase can you help me with this idea?
I need backup power supply for 12V application. This application will be supplied from 230 to 12V/0,5A wall adapter.
Do you have any idea? Step-UP converter from 12V to 14,5V and diodes? I know only 2577 step-up converter and this will be very big...
Many thanks. This is good IC, but have a bad package. QFN is difficult to solder. I foud any application note from microchip where was cheap Liion charger with external Mosfet and diode. This mosfet switch load to power supply, or lioon when power supply down. Is it good idea? Thi is cheap...
Hi boys,
I need Liion backup for my GSM module apllication.
I have 12V supply, which is regulated to 4V. I found MCP73871 for Liion charging.
When I remake circuit and use this IC as power IC, with Liion backup, will be power supply enough for GSM module when I use this without Liion? Liion...
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