PAKIDIL Posted April 20, 2007 Report Share Posted April 20, 2007 hello there, can any help me Please how to make a circuit work by applying 10mv as an input and the output should be 4v or 5v (working with emitter follower ) can any 1 help in this or any site ? please Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 20, 2007 Report Share Posted April 20, 2007 An emitter-follower doesn't have voltage gain. With a 10mV input, the output is about 9.99mV.A common-emitter single transistor amplifier has a max voltage gain of about 150, but you want a gain of 500.Why not use an opamp? Quote Link to comment Share on other sites More sharing options...
PAKIDIL Posted April 20, 2007 Author Report Share Posted April 20, 2007 can u please tell me the site where it is used ? or any circuit ? becoz its given by our instructor as a project and i and my friend is trying hard to make it so can u please help us ? Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 20, 2007 Report Share Posted April 20, 2007 Maybe you were told to make a transistor amplifier with a gain of 500 and it must have an emitter-follower at its output.Then make a two or three transistors amplifier.I shouldn't do your homework for you but I have a two transistors amplifier with Q2 as an emitter-follower. It has a 10mV input and a 5V output. Quote Link to comment Share on other sites More sharing options...
PAKIDIL Posted April 21, 2007 Author Report Share Posted April 21, 2007 Thanks it helps a lot. but can i have small circuit with npn or pnp transistor with easiest way ?please ? any help ? Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 21, 2007 Report Share Posted April 21, 2007 Thanks it helps a lot. but can i have small circuit with npn or pnp transistor with easiest way ?please ? any help ?My circuit has a voltage gain of 500 and has an emitter-follower at its output.The circuit might be a little simpler if it has 3 or 4 transistors. Quote Link to comment Share on other sites More sharing options...
login
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.