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Recent content by mandriva

  1. M

    Changing polarity of a wire

    Hi My Dear Friends, I am designing a telephone interface. I have used an npn optocoupler in my ring detector circuit. I have connected telephone's red and green wires to pin 1 and 2 of optocoupler through some elements such as capacitors, resistors and diodes. Then I have connected emitter pin...
  2. M

    Interfacing ATmega32 with FM24C256 Memor

    Hi My Dear Friends, I want to store an string on a location of FM24C256 FRAM and then retrieve it and display on a alphanumeric LCD. As this memory uses I2C, I have used CodevisionAVR's I2C example to implement my project. The problem is that it seems write operation is done correctly (I am not...
  3. M

    Looking for the pinout of P521 Optocoupler

    Re: P521 Optocoupler Hi Dear, I have built a telephone ring detector circuit. I have connected to the Ring (Red) wire to the pin 1 of optocoupler tough a capacitor and a resistor in serial and have connected Tip (Green) wire to the pin 2 through a 1N4007 diode. capacitor - resistor is parallel...
  4. M

    Looking for the pinout of P521 Optocoupler

    Re: P521 Optocoupler Hi Dear, I am unable to find pin numbers on the element as there is no sign determines the element's start and end. I have attached the element's image. Also please describe how to connect its output to a microcontroller. Thanks.
  5. M

    Looking for the pinout of P521 Optocoupler

    Hi My Friends, Last day I got a P521 optocoupler. But I am unable to find any datasheet for it. I just need to know its pin configuration. But I am unable to find it. Any helpful idea will get rewards in paradise.
  6. M

    Sending pickup signal to the phone line

    Hi Dears, I have implemented a circuit which outputs a digital pulse when the phone line starts ringing. Now I need to implement a circuit which sends a pickup signal to the phone line and starts communication between my device and the remote one. Any idea will be highly appreciated.
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