If you're building a separate preamp in front of it, why add the 741 at all?.thanks deepak.. that is why i am asking .. i know uA741 is an very old op amp and will produce a lot of noise.. so is there any ways to make it less noise?? maybe building it in few stages pre amp??
At that level, you don't need a very low noise op amp like you do for a microphone or phone pre amp. You could just use any decent op amp with adequate slew rate like an LF-356 or TL-084 or many others.Hi audioguru , i am amplifying a audio signal with 200mVp-p at 1kHz .. it will be used as a music wave and be amplify using a audio amp TDA7052.
the preamp is to stablize the input... but gathering all the info here.. i can conclude that my signal is rather big enough.. so an op amp will already stabilize the signal right??We don't know what you mean when you say "stabilize the output". Your 200mV signal is big enough to feed directly into a TDA7052A power amplifier.
What will the switch do? If you want to mute the audio then use the DC volume control function built into the TDA7052A amplifier. It mutes with an attenuation of 80dB.how about the transistor as a switch part?? can anyone teach me?? thanks..=)