asrarbaig

Dear Mr. Guru, I am sorry for being absent for a long time. I am not using a low passfilter and it is still ok. If i connect an audio power amplifier with a pre-amplifier i can hear a clear noise. Actually i m using a pre-amplifier circuit and would like to know what is the purpose of capacitor C2 in the circuit. You gave the explanation but i am sorry i didnt understand it. As you have said it block the dc but it is not at the input of the circuit so i was wondering. Well i will be grateful to you for the kind reply, Thanking you, Yours Faithfully, Mughal.

Hi dear Mr. Guru, Thanks a lot for helping me out. actually i am using a low pass filter after the pre-amplifier circuit but when i am connecting both the circuits i am getting a voltage of 10-12mv at the low pass filter output where as as the input of the lowpass filter from the pre-amplifier is 100 mv. my cutoff frequency is 3.5 KHZ i dont know whether this preamplifier can use for this frequency. waiting for your reply, thanking you, Yours Faithfully, Mughal.

Hi Mr. Guru, Thank you for your kind reply. I have one more doubt regarding the circuit if we change the variable resisor with a higher value we can increase the gain to a more extent but is it safe to do that may be to use a 250K ohm instead of 100K ohm. what do u suggest. well thank u again, Yours Faithfully, Mughal.

Hi Mr. Guru, thanks for the wonderful and easy to build circuit that you provded. I tested the circuit and it is perfect means that i can change the output as i like. I need your help again i am using this circuit for my project but i dont now how it works can you help me regarding this in detail if possible. well i have to write it in my projet report. Waiting for your reply, Thanking you, Yours Faithfully, Mughal.

Hi everyone, well i m new to this forum an i need your help. i m building a voice scrambler but i am stuck in between. i would like to know which mic-preamplifier circuit is the best for producing an ouptut voltage of 0.7 Vpp or less than that so that i can give it to my scrambling circuit. thanking you all, bye. regards, Mughal.

Hi everyone, well i m new to this forum an i need your help. i m building a voice scrambler but i am stuck in between. i would like to know which mic-preamplifier circuit is the best for producing an ouptut voltage of 0.7 Vpp or less than that so that i can give it to my scrambling circuit. thanking you all, bye. regards, Mughal. :)