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Topic: Will this Amp work? (Read 1 time) previous topic - next topic

Manny_Bee

Sep 01, 2011, 04:18 am Last Edit: Sep 01, 2011, 04:23 am by Manny_Bee Reason: 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


Manny_Bee


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...:smiley-roll:.....Anyways, thanks!

Manny_Bee


Quote
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. :P

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

raalst

#3
Sep 01, 2011, 11:03 pm Last Edit: Sep 01, 2011, 11:06 pm by raalst Reason: 1
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...

Manny_Bee


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!

Techone

@Manny_Bee

Here a basic Commun Emiter Transistor circuit.


xray303

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



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