Lm358 Audio Amplifier Circuit3/26/2021
For a better experience, please enable JavaScript in your browser before proceeding.Voltage gain of this circuit is calculated:650 with this circuit you can obtain (my circuit with complementary) 28 watts with the 4 ohm load.(actual watt) if you decrease ohm of your load power will increase.I use basic audio amplifier but unfortunately it didnt work and I used 12V instead 9V and for some of the Electrolyte capacitors I used the same capacity and higher voltage for example 470uf-50v instead of 470uf-16v or 10uf - 35v instead 10uf - 16v.But you still make the amplifier quality worse, by adding a complementary buffer.
Unfortunately, the second (tone control) stage misses a similar means. Lm358 Audio Amplifier Circuit Driver Stage NodeThe driver stage node (Q12.C) needs to swing three diode voltage drops to switch from current source to sink. A class AB output stage would have NPN and PNP output transistors biased to active state simultaneously. A bias voltage source as in UA741 is required to achieve this, see Q19Q18 in the below schematic. I experienced the effects of LM358 crossover distortions many years ago and dont need additional empirical evidence for it. Im still using this part in many designs where its appropriate, but not for audio related applications. If you want, i can take photo from face of my oscilloscope that showed its out put without crossover distortion. Its still class A, falling into class B above 50 uA. P.S.: I didnt consider an important point. The usual LM358 macro model doesnt represent the output stage correctly. By continuing to use this site, you are consenting to our use of cookies.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |