Will this Amp work?

Using Arduino Audio
1

I found this schamatic for a voltage amplifier. Will this work for amplifing sound? And how would I find out how many ohms the resistors should be?

Thanks!
Manny

2

KE7GKP:

  1. That is a theoretical circuit, not a practical one. Note the it shows two batteries for power. That is not practical.
  2. That is a "grounded base" circuit which is rather unusual. It is found only in circuits that require very low input impedance and/or high frequency.

To answer your question, I would have to say, no, it probably won't work for whatever you are planning. But since we know nothing of the application I am only guessing.

I'll just have research ic amps I guess...I got more lots learning to do...ARGGHH...:roll_eyes:.....Anyways, thanks!

3

KE7GKP:

I'll just have research ic amps I guess

Why? A single-transistor circuit is perfect for many applications that don't need a whole op-amp, etc.
But that common-base circuit is probably the least practical of any of the standard transistor circuits.

Do you mean like this?

Sorry for the bad image. Did it with my laptop touchpad. :stuck_out_tongue:

I thought I saw somewhere where this isn't a good circuit, hopefully I'm wrong.

4

since you want an amp, maybe this is a useful tutorial on using a transistor as an amp

http://www.nerdkits.com/videos/sound_meter/

just watch the video...

5

raalst:
since you want an amp, maybe this is a useful tutorial on using a transistor as an amp

http://www.nerdkits.com/videos/sound_meter/

just watch the video...

Thank you! And KE7GKP. I watched the first part of the vid and a little of the seccond but got lost. So i'll need to watch it again and stop it to allow time for it to get into my skull, lol. If I have anymore questions i'll ask! Thanks again!

6

@Manny_Bee

Here a basic Commun Emiter Transistor circuit.

simpletransistor.jpg
simpletransistor.jpg1357×973 141 KB

7

Hi,

There are example of class AB with transistors
http://hackaweek.com/hacks/?p=332

or a simple amp with single transistor :

http://hackaweek.com/hacks/?p=327