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Recent content by YEAR_

  1. Y

    How to increase amplitude of output voltage from 100 m V to 1V

    A properly biased Transistor must have the ability not distort an input signal at the output, transistors have a lower limit of input voltage before it shows up at the output which is determined by the base emitter voltage. so by biasing, you have to put the base at higher voltage than the...
  2. Y

    i want a better switching circuits..

    You mean RS-232 interface?
  3. Y

    Communication between 3.3V USART system with a 1.8V USART system

    You need voltage converters on both Rx and Tx, you can use simple Transistor based circuit. some GSM manufacturers provide reference circuits.
  4. Y

    [PIC] PIC Malfunction when other devices are switched on/off

    It may be related to the switching regulator, may be it is not stable enough to prevent the PIC from Brownout reset. use proper power line filtering.
  5. Y

    Charlieplexing Seven segment led problem?

    hemnath requested help on charliplexing and I think with charliplexing for 4 SSD, with the decimal ignored, it should be implemented with only 8 pins not 9, 10 or 11, that is the whole Idea of Charliplexing, minimizing pin count. So on jayanth.devarayanadurga's schematic the common...
  6. Y

    [SOLVED] Battery drop problem

    amayilsamy, you said you are supplying 10.5v to LM317. if you need 8.4v at the input to the battery you should consider the dropout voltage on the LM317, which is well over 2.5v, the design uses a 12v supply, so better use that voltage otherwise the battery won't charge enough.
  7. Y

    what does latching mean exactly

    Hi Manavdeep Singh, Please make your questions a little bit elaborate, specify the development environment like language, processor type and so on.
  8. Y

    microcontroller serial communication

    Hi, malik ahsan Yes the baud rate is dependent on the crystal frequency. baud rate is set by SPBRG register. On the datasheet it says for 16MHz crystal SPBRG = 25. try to write and read any register value from the corresponding transceiver as a debugging measure just to check if the...
  9. Y

    [SOLVED] Problem with ADC @ PIC16F877A

    Hi Mithun Is the ADC configuration not changed/corrupted during ADC conversion. why don't you implement ADC_Read() by your self. I think you know that every conversion is initiated by setting bit 2 (GO/DONE) of ADCON0.
  10. Y

    somebody help me in this recursive pgm???

    This will put your program in an infinite loop. The problem with the code is 1. you are using n1 as a case condition. 2. your program is recursively calling itself without modifying n1. n1 can't be updated unless the following line is executed. what you can do for example is...
  11. Y

    [SOLVED] Problem with ADC @ PIC16F877A

    hi Mithun_K_Das Are you using DHT11, the temperature & humidity sensor? So you are processing one data with the PICs' analog port and another data with the DHT11? If i get it correctly, it has a bidirectional single wire communication. Sometimes, even clock synchronized bidirectional serial...
  12. Y

    [SOLVED] Problem with ADC @ PIC16F877A

    Are you changing the ADC configuration frequently in the code? You want to convert the Digital signal with ADC??? post your code, please
  13. Y

    Merging multiple VHDL designs

    Look at system design section (chapter 10 and 11) of the book "Circuit_design_with_VHDL_by_Volnei_A._Pedroni"
  14. Y

    Power Factor of 1 VS .7 power factor , What is the difference?

    power factor signifies the amount of power that is consumed(active power) and reflected(reactive power). Loads with some capacitive/inductive behavior dissipate some of the energy as active power and store the other and return it back to the source as a reactive power. active power -> P = V X...

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