diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Chip Amps (http://www.diyaudio.com/forums/chip-amps/)
-   -   most simplest transistor amplifier? (http://www.diyaudio.com/forums/chip-amps/220323-most-simplest-transistor-amplifier.html)

realflow100 25th September 2012 12:31 AM

most simplest transistor amplifier?
 
Okay I want to build the most SIMPLEST audio amplifier without any resistors or capacitors
but only using one transistor
(i only have a bunch of varying sized field effect transistors)
but I think it will be the same as any other transistors or extremely similar.
I don't care how BAD the sound is I just care if it actually amplifies the signal a bit

I have the batteries.. the headphone jack input wires that plugs into my computer.. the speaker and the transistor and that's all I want to use for this project. no more no less
can someone show me how to wire each wire to the transistor to make it work?
and without any resistors or capacitors.
I did this once before and it worked
although it sounded very distorted I didn't care about that I only care that it amplifies sounded like guitar amplifier distortion sorta

but I can't remember how I wired it

can someone show me a wiring diagram on how to wire it all together?
I have no skills whatsoever in diagrams.
so a very simple wire to wire diagram would be of much more help.
and no biasing or however you spell it
i just want to use it as a simple as can be amplifier no matter how bad the output quality is

Minion 25th September 2012 01:10 AM

You need resistors to bias the transistor and you need capacitors to block the output DC unless you use a transformer on the output ..... not possible to not use resistors unless your psu supplies the correct biasing voltages ......

You can try it yourself , a transistor only has 3 leads so one is positive , one is negitive and one is the signal input and the output can be taken from either the positive or negitive but more commonly the positive ......

realflow100 25th September 2012 02:11 AM

I know a transistor only has 3 leads but I did it one time WITHOUT resistors or capacitors and it did work!
I used it more like a switch than an amplifier
unless you want to explain in detail where every single wire goes to every single connection and how the signal flows from here to there and there to here
and where exactly to place each wire on the end of each lead of the resistor or capacitor or whatever and where to place the wires from those to the other connections and where those connections go..
i cant just know where everything goes you have to explain in detail which wire goes to which lead either it be positive or negative or somewhere in between
and then i have to waste my money going to radio shack to find the exact thing that i need

or you could just say how to make an on and off switch amplifier which makes ten times more sense and is ten times easier i dont care how bad it sounds i just care if it can make a speaker make bigger sound than what comes from the headphone port on my computer.
i dont care if it makes a complete square wave if it will at least work.. then i could go on from there and try to make it sound better...
i'm a total noob at this stuff so don't scream at me for not knowing how to make a simple amplifier..

Minion 25th September 2012 02:25 AM

The collector is the Posistive voltage pin , the emitter is negitive and the base is the input , the collector is usually the voltage output (usually through a capacitor to block the DC ) but can also flow from the emitter with the phaze reversed ......

maxo 25th September 2012 02:30 AM

Quote:

Originally Posted by realflow100 (Post 3177623)
I know a transistor only has 3 leads but I did it one time WITHOUT resistors or capacitors and it did work!
I used it more like a switch than an amplifier
unless you want to explain in detail where every single wire goes to every single connection and how the signal flows from here to there and there to here
and where exactly to place each wire on the end of each lead of the resistor or capacitor or whatever and where to place the wires from those to the other connections and where those connections go..
i cant just know where everything goes you have to explain in detail which wire goes to which lead either it be positive or negative or somewhere in between
and then i have to waste my money going to radio shack to find the exact thing that i need

or you could just say how to make an on and off switch amplifier which makes ten times more sense and is ten times easier i dont care how bad it sounds i just care if it can make a speaker make bigger sound than what comes from the headphone port on my computer.
i dont care if it makes a complete square wave if it will at least work.. then i could go on from there and try to make it sound better...
i'm a total noob at this stuff so don't scream at me for not knowing how to make a simple amplifier..

check this RealFLow
as minion says
you need resistors to bias the transistor more less in the correct way
check this simple design, it dont have caps but you need some resistors

Chapter 10: Computers and Electronics -- Build a simple 1 watt audio amplifier

realflow100 25th September 2012 02:39 AM

I have seen that one before and I have attempted to do it but I failed because I can't figure out where the input wires go exactly and whatnot.
and it's really difficult without some sort of 3D diagram showing which positive or negative wire goes where or which lead goes where

how different are field effect transistors, pnp transistors, and npn transistors? like how do they do the same thing differently..
or how do they do different things?

and again.. I have no clue which lead is positive or negative or some straight wire in between.. (i dont know where they go to the power supply or input or the transistors leads or the output to the speaker.)

in order for me to know how to make an amplifier i need to know a few things first.
one is where the positive and negative wires from the battery
(or power supply) have to go on the correct leads on the transistor

and two I need to know where the positive and negative input wires go and which leads of the transistor they need to go to
and I need to know which leads of the transistor go to get to the speaker
and I need to know the exact polarity of everything and which positive goes where and which negative goes where and which wire goes where and whatnot.

and I just realized how much more I type than anyone else on the forums O_O sorry for that.

DUG 25th September 2012 02:55 AM

There is a diagram (schematic) about half way down the page that maxo suggested.

The input and battery positive and negative connections are shown on that diagram.

The positive input is labeled +input, the negative input is labeled -input.

The battery positive connection (9V in this case) is labeled with + 9 volts.

To connect the correct polarity (positive and negative) to the transistor you need to look at the data sheet of the transistor you are working with. This is a must since they are not all the same.

Learn well

Minion 25th September 2012 02:59 AM

Also if you look up the datasheet for your type of transistor it will show which wire in Collector, Emitter and Base ......

realflow100 25th September 2012 03:00 AM

how do I do that?

sofaspud 25th September 2012 03:14 AM

There should be numbers and letters on the transistors you have. Tell us what they are. Or at least give us the Radio Shack part number (eg 291-xxxx) printed on the package.


All times are GMT. The time now is 03:26 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2