I get the feeling you have no idea what you are talking about. I suggest you do some research on what waveform, frequency, current, etc. actually is before you post here again.
Der Strom
@DER strom my problem is not that i don't have a basic of electronics or something like that no
my problem is totally about language i study with french and my english is so poor for that i took a moment to write what i want to say
This is a website where we speak in English.
Then why does somebody who speaks in French come here?
Doesn't France have some electronics chat websites?
@DER strom my problem is not that i don't have a basic of electronics or something like that no
my problem is totally about language i study with french and my english is so poor for that i took a moment to write what i want to say
I understand the language issues, as I have come across them before on this forum. I suppose I mis-phrased what I was trying to say, and for that I apologize. What I meant was a basic understanding of the meaning of each word, such as frequency,for example, as you misused it several times. If it would help you, you may be able to use an online translator, such as this one. Just type your question in French and translate it to English. Then you can copy and paste the translation here. It is a very useful tool that could help a lot in the long run
Der Strom
here is this diagram represents an audio preamplifier in a receiver Fm this preamplifier comes directly after Ci (TDA7000 which makes the modulation) the tension of entry is 5mV and I want to have an exit of tension of 0,8 V for that we uses a transistor bc109 has Ic=0,5 hfe=300 Vbe=0,7 if there is Vcc=4,5 v and Fixes Vce=2v how i must choose my resistors to have the output voltage 0,8 v???