Shahriar

Hi ooooooooooooh I Myself found the answer and this is the greatest exprience in my life I had forgotton to solder one of the jumpers whic was related to -Vee Net, so we take this result that if you forget to solder -Vee then the NE5532 gets hot and the device do NOT work properly ;D so remember to count the jumpers when you finished soldering, but I expected Distortion in case the Lack of -Vee but why the things i said above happened? Anyway I am very happy

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 so that I can control the volume of all just by one Pot... the schemtic is attached... your help is appreciated in advance... Headphone_Buffer_Amp.pdf

Dear Black wing 5v relay are easy to find, in my place i can by each of them for 50 cent. they are also small enough HTH Shahriar

Dear Kasamiko I have never heard that someOne coul repair his Windows, I think you are not infected, all things that happend is that your Windows has been corrupted, uninstall you windows, and everything will be OK, to prevent this again, never install games on your computer, if you want to play games with your PC you should install your windows 4 times a year, try Windows XP with Service Pack 2, and it is possible use NTFS format. HTH Shahriar

Dear Kumar I think you can find what you are looking for in this project HTH Shahriar StepperMotor_DriverWith5804.zip

Thank you so much for your always complete answers and also for your explanation about PMPO....

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 correct? The model of the headset is 'GALAXY AP-860'.On the box of Headset is written (Mic:Condensor type),(Polar Pattern:Omni-directional) (Sensivity:-40db),(Connector:3.5mm Stereo Plug*2) ThanX in advance...

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 advance...

Dear Trigger and Suraj You are right by changing the place of components we can rout the Board butcan you tell me that How designers of TV sets design the PCB in case there are more than 2000 components on a TV Chasis, Do they use special Softwares. If i have to place the Components manually, so what is the autoplacer good for? Thanx in advance...

Dear Trigger and Suraj You are right by changing the place of components we can rout the Board butcan you tell me that How designers of TV sets design the PCB in case there are more than 2000 components on a TV Chasis, Do they use special Softwares. If i have to place the Components manually, so what is the autoplacer good for? Thanx in advance...

Dear darrin I have tried many ways for making PCB, Do not make yourself tired with making PCB, The Cleanest & Cheapest way is to draw your Schematic and PCB yourself and give the file to Fabrication... Today no one can do everything, Desinging, PCB, Soldering and etc. Spend tour time with designing and thinking about circuits instead of Seaching in PCB meterials. Protel DXP and Eagle are two good Softwares.

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

Hi, I hope I can find such relays. Can anybody tell me what is the exact meaning of RIAA (Recording Industry Association of America)? Is Normal VCD or TV audio ourput a kind of RIAA? ThanX...

Thank you so much for your good replies Audioguru... ;)

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 Audio signal Noisy?

Dear Sir Thank you so much for your valuable recommendation

Dear Sir Thanks very much for your reply, But some questions

Sorry, here is the Picture

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 swiches are to be controlled by the teacher. The quality of Sound is important... ThanX a million

Thanks a lot for your help... :)

Hi, I want to use the pcb of the 30V power supply but when i print it, it Becomes too much big, Can anybody tell me how i can fit it in actual size (12.5cm x 8.7cm) your help is appreciated in advance

Dear kasamiko i opened your circuit By protel DXP, and export your needed Meta file (Attachment), i let the protel to have the Drill hole in your PCB, if you needs the hole out of your PCB, then tell me... HTH, Shahriar YourPCB.zip