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Recent content by ThirunavukkarasuThoondi

  1. ThirunavukkarasuThoondi

    Hydro Electric Power Vs SMPS power supply

    Hi we are using the SMPS power supply for our security system. In India particularly in the Kerala state we are getting Hydro powered electricity. Regularly SMPS power supply getting fault in this state when compare with the other states of India(there we are getting different electric...
  2. ThirunavukkarasuThoondi

    [General] Detecting the telephone line presence without loading the telephone line voltage

    Hi we doing some Telephone dialer projects. in our projects we have change over the telephone line from two different telephone lines why because if one line is failed we have switch over to the next line. (which one is available) we have to detect the availability of lines with out affecting...
  3. ThirunavukkarasuThoondi

    [SOLVED] Keil C programming(89s52)

    Hi you have missed the semicolon in the function declaration of void msdelay(unsigned int itimes) function and All of your subroutines are return type (as you wrote) but your functions declarations and functions are void function(as you wrote) Thanks
  4. ThirunavukkarasuThoondi

    [General] Modem AT command error

    Hi Rocket you have to use this format - AT+CMGS="+447123456789" then next line commands (this is correct if you use SIM900 or quectel modems). you read the character '>' as reply from the Modem then send the text to be sent as SMS. Thanks
  5. ThirunavukkarasuThoondi

    [SOLVED] How to check rs232 to rs485 converter?

    Hi You may need one more RS485 to RS 232 converter. you should not short the RS485 Data+ and Data -. Thanks
  6. ThirunavukkarasuThoondi

    [ARM] RTC Time is Lacking within 15 days by 2 minutes to 8 Minutes

    Hi we are using the 32.768 KHz crystal in the PCF8563 RTC circuit. we are using 3.3VDC supply and CR2052 (3V lithium Battery) using BAT54C ORing Diode module. if we measure the frequency at the crystal points we will get the 32.768 KHz . But the Time Lacking is there. Please give some...
  7. ThirunavukkarasuThoondi

    Enabling or Disabling the pin in AT89C51 in C

    Hi Eshal If your LDR circuit output is digital (logic low and High ). else use some hardware to make it as digital. Thank you
  8. ThirunavukkarasuThoondi

    [ARM] LPC812 Micro controller - with EEPROM AT24C512 I2C Communication

    Hi we are using EEPRM AT24C512 in our LPC812 micro controller Based data logger project. The I2C communication is working properly (continuously) for 2 or 3 days with out any problem. But suddently it is giving all data as "00" (mostly). The connection we have made with AT24C512 is given in...
  9. ThirunavukkarasuThoondi

    Power Supply for GSM based Project - Battery operated system

    Hi we have got the MCP73843 charger for Batteries .Shall we go for the final design. And please help us the connector for the BL -5c Battery. where we go for the data sheets and purchase. Thanks
  10. ThirunavukkarasuThoondi

    Power Supply for GSM based Project - Battery operated system

    Hi treeZ & Hobbyckts thanks for the suggesstion. we have got the LDO LM29150.3.3V . which is the 5V to 3.3V regulator with 1.5 Amps rated. Is it reliable for the charging the purpose uses. we are charging Mobile Phone battery through this regulator. Battery specification is 3.3V x 2500mA ...
  11. ThirunavukkarasuThoondi

    Power Supply for GSM based Project - Battery operated system

    Hi We developing GSM based project which is working battery (cell phone battery). we required the charger to the battery. please suggest some regulators which is available in India for minimum quantity.(10 to 50Nos) Thanks
  12. ThirunavukkarasuThoondi

    using cd4097 for multiplexing 8 channel qei

    Hi Raman we used for encoding and decoding purposes
  13. ThirunavukkarasuThoondi

    using cd4097 for multiplexing 8 channel qei

    Hi CD 4097 can be used.we have used it in our applications. Thanks
  14. ThirunavukkarasuThoondi

    [ARM] LPC1768 Microcontroller Ethernet controller with LAN8720

    Hi we are using LPC1768 Ethernet conroller with LAN8720 for TCP -IP communication for our Applications . 25% of LAN 8720 controllers stops working or not working from initial bring up. But remaining Boards are working properly. Please give suggestion to come across this trouble. Thanks...
  15. ThirunavukkarasuThoondi

    Wich current on Gate?

    Hi transistor W2F can be replaced by High frequency transistor
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