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shaiqbashir

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Posts posted by shaiqbashir

  1. Laser Communication

    in Electronic Projects Design/Ideas

    Posted

    Hi guys!

    well im posting below two diagrams. The 1st one is of the transmitter and the other one is for the reciever. The laser light will be used as the signal carrier. My question is this that as it is written in the diagram that the condenser mic is to be used. Now is it correctly written?

    what will happen if i use a electret mic here. I m thinking of using an electret mic with a preamplifier using TL071 opAmp. will it work?

    please do tell me about the technical defficiencies of this circuit if exist.

    Thanks a lot and Good Bye!


    laser_trans.JPG
    [img width=680 height=451]http://www.geocities.com/shaiqbashir/reciever_laser.JPG

  6. designing a power audio amplifier with OP AMP

    in Electronic Projects Design/Ideas

    Posted

    hi again!

    well! i have connected all the ground pins of LM380 with each other to the ground. But still im facing one strange thing:

    this is happening almost regularly that whenever i press LM380 with my thumb on the breadboard, the noise stops and all become quiet. but when i release i hear the same bOOOOOOOOOOOOOOOm sound. But still the microphone is not working. I tell you that i have connected two jumper wires with the condenser mic. So, should i remove them ? what sort of wires should i connect with the mic?
    Please help me because it looks like that there is a little problem and after that the amplifier will work fine.

    Thanks in advance!

  10. designing a power audio amplifier with OP AMP

    in Electronic Projects Design/Ideas

    Posted

    Hi Audioguru!

    my dear friend!

    i made the circuit which you have suggested above. Now what im getting is a booooooooooooooooooooom sound from my speaker continuously which increases or decreases on varyinf RV1 and volume control.

    Im not hearing any sound when im speaking in mic. :'( what should i do now?

    remmeber that im testing this circuit on breadboard right now. and the 1000uf capacitor which is connected with the supply, is of 16V instead of 25V.

    secondly, i have made no ground in the circuit, just connected negative supply pin to the grounded connections. Im assuming negative supply as ground.

    Please tell me if any mistake im making!

    i shall be very thankful to you for this act of kindness.

    Regards,

  11. controlling the PC with IR remote control

    in Electronic Projects Design/Ideas

    Posted

    Hi Guys!

    well ! i want to make a circuit with which i can control the computer with a TV remote control. IN the projects>PC related section of this website there is  a circuit (Billy's Plug) which im looking for reference but the greates problem in implementing that is this that the IC TSOP 1736 is not available here at all. Now, what my question is that is this possible to replace this IC with a photo transistor or photodiode with smalle replacements. If yes then how to do that?


    plz help me as soon as possible!

    thanks and Good Bye

  14. Dual Polarity Power Supply

    in Projects Q/A

    Posted

    Hi guys!

    well! i m trying to build a power supply in order to power up my operational amplifier circuit which requires around 12-15 V and 245mA of current!

    will this circuit be suitable for that!

    http://www.electronics-lab.com/projects/power/015/index.html

    here is its circuit diagram:

    supply3.gif

    now the description given about this circuit that the voltage are adjustable from 0-15 V but what would be the current output of this circuit?

    I want a current output of 245mA.

    pplz help me as soon as possible!

    Thanks in advance!

  15. Variable DC Power Supply

    in Projects Q/A

    Posted

    HI guys!

    well! i just came across this circuit in the project section of this website:

    http://www.electronics-lab.com/projects/power/011/index.html


    here is its diagram:

    PowerSupply.gif

    now i want to ask you about its quality? will it work properly or not?

    i want a voltage of around 12-15 V and a current of 245 mA. what do you think that this supply will be able to provide that or not? is there any technical mistake in its partlist or design. Plz do tell me about that!

    Thanks a lot in advance!

    Good Bye!

    Regards!

  18. difference between negative supply and ground???

    in Electronic Projects Design/Ideas

    Posted

    Hi Guys!

    well! i have seen in many circuits diagrams that there are some connections to a negative supply lets say "-5V" and some to grounds.

    now i want to ask you that what is the difference between them?

    actually i want to know it like this that while making a circuit how we have to configure a negative supply and a ground?

    is it true that battery's negative side serves as the circuit ground. If no then how we actually develp a ground in a circuit.

    Thanks in advance!

  19. designing a power audio amplifier with OP AMP

    in Electronic Projects Design/Ideas

    Posted

    Hi Audioguru!

    well! a bundle of thanks to you for your tremendous help.


    Now my dear friend! is Ron Elliot's preamp is the same whihc i have shown above:

    and one more question

    The power amplifer figure that is present on top most part, requires a mic at its input. Now can i use a mic preamplifier as its input. What will be the change in effects. Is it going to give some greeeeeeat results?

    secondly if i want to play music in this amplifer, should i use a capacitor of around 1000uf?

    Thankss in advance

    Regards,

  20. Audio Amplifier Plz check this out

    in Electronic Projects Design/Ideas

    Posted

    Hi Audioguru!

    im thankful to you for your immediate responses.

    Actually i have taken this idea from a website:

    http://www.mines.edu/Academic/courses/physics/phgn217/lab10/lab10handout.htm

    here you can see that LM380 is used in almost the same configuration as i have used. Now my dear! according to your advice, if i just remove the pin2 of LM380 and connect it to the ground. will this circuit work then?

    PLease help me !

    actually i should have made these tests myself but my simulation software doesnot have this LM380 in it.

    I have the datasheets as well!

    Thanks in advance

    Regards,

  23. designing a power audio amplifier with OP AMP

    in Electronic Projects Design/Ideas

    Posted

    Hi Guys!

    well! i want to design a power audio amplifier with OPAMPS. Now i read somewhere that the one of the various Op Amps available for this is LM380.

    Now here is the basic circuit:

    Image56.gif

    now my dear friends! this circuit will work i guess. But i dont think that its a power amplifier. Now can you tell me what modifications should i have to make?

    similarly can i use this circuit as a electret mic preamplifer :

    index.php?action=dlattach;topic=5202.0;i

    and then the output of this preamplifier i want to use as the input of my power amplifier.

    Is this possible, what i have to do?

    plz help me as soon as possible.

    I shall be thankful to you for this act of kindness.


    remember that i want to operate speakers at the output (8ohms, 4 ohms or 2 ohms)

    Good Bye!

  25. Please recommend the alternative of this IC

    in Datasheet/Parts requests

    Posted

    Hi Guys!

    How are you?

    well! im trying to make the following project:


    http://www.electronics-lab.com/projects/pc/019/index.html

    Now the problem is that following parts are not available in my areas:

    TSOP 1736/38/40

    I know that this IC is the backbone of this circuit, but unfortunately this is not available in my areas. Please tell me any suitable alternative to it. So that i can make this project.
    I shall be thankful to you for this act of kindness.

    Good Bye!

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