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  1. Shahriar

    Mysterious Resistor?

    Hi I have made a preAmp From a datasheet from Texas Instrument that the PDF is Attached, But i Think somthing is missing because when my hand touched the Capacitor (Cx) accidently then i found that i have to Solder a big value resistor between the output of the Capacitor and SGND (Rx), but...
  2. Shahriar

    NE5532 becomes hot?

    Hi I have build a headphone buffer amplifier but there is a problem. at first the sound is weak then as the NE5532 becomes hot the sound increases untile the IC becomes very hot and then Hiss in sound appeares i have also made some changes, i have used a 100K Pot instead a !00K pot for every IC...
  3. Shahriar

    Condesor Mic Pin Map?

    Hi I have a Multimedia headset (Stereo Headphone with Mic ), and I want to build a PreAmp for the Condensor mic, it has a stereo XLR 1/8" plug it is a very general headset and works with PC Sound cards perfectly Does any boady know the pin map of the Mic Plug, which of the following pics is...
  4. Shahriar

    The Meaning of PMPO?

    Hi everybody, Can anyone tell me what is the meaning of "3000 watt PMPO" or some other things that are written on Casset players, if you take a look on the Speaker: "4 watt, 8ohm", if we imagine the calculation of PMPO power is based on the pick of voltage, it won't go so much.... ThanX in...
  5. Shahriar

    Protel DXP PCB Question

    Hi I want to design abig single side board with DXP but I have got bored with changing the place of component, how can i put the components in the best status, so the less jumper wll be used, what is the easiest way to put the jumpers.... Thanks in advance
  6. Shahriar

    Audio Signal Switch

    Hi I am working on a project and I want to select a microphone through other 19 Mics to connect it to PreAmp. I want to select Mics By a 89c51, what kind of relay or switch can i use... ThankX in Advance P.S. if I use ordinary switch to select Mics Manually, Does Ordinary swiches make the...
  7. Shahriar

    Connecting An Audio Output to 20 Headphones...

    Hi I want to connect a VCR OR VCD audio output to twenty headphones, this device is to be used in an English Institute Laboratory, as you can see in the picture i have name it Black box, The second problem is connecting twenty Microphone to the Black box, What kind of Amplifier is suitable? The...
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