Trying to amplify signal

[saturated]

I'm trying to make a simple signal tracer amplifier

So the first thing I did was connect the signal generator leads straight to an 8 ohm speaker 🔇 to prove that there would be no sound because it needed to be amplified 

Unfortunately it came through loud and clear 

Alright well my little cobbled up one transistor will just make it LOUDER

Unfortunately it did not.

Now there's probably a million things wrong with my circuit but that's kinda the reason I set out like this without looking up a recipe

So this seems to work but it's not as loud as just a direct connection

Also I made the circuit without looking anything up the resistors were arbitrarily chosen and I remembered seems like the base resistor is always a large value

Also the capacitors were arbitrarily chosen

I do get forward bias on base to emitter

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And obviously yes I'm gonna have to crack open some books and try to see what's up

For instance right now I'm kinda wondering hmm what do I need to make it louder CURRENT GAIN

OR VOLTAGE GAIN

I'm pretty excited to get through this part because next I want to take a look at complimentary pair and then also I want to use some 8 DIP amplifiers

And here's one old lady that's glad the storm is gone 

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[J M Fahey]

Well, good intentions but a couple problems.
1) you are injecting signal on the +V rail.
That may have 10-15V DC on it  but it is Audio ground, so you are shorting your signal.

2) same thing, speaker is connected to same +V Audio grounded rail.
Nothing audio there except maybe some hum or ripple.   

3) get a tutorial on how to design a single transistor gain stage.
Values are not random.

4) even if, an 8 ohm speaker has way too low impedance to be driven by a humble small transistor.
Back in the day, Student circuit examples used a very high impedance crystal headphone (almost unobtanium today) o a 2 k ohm magnetic headphone (same thing)

If you want simple, use a small IC such as LM386



Full article:
https://electronics-diy.com/electronic_schematic.php?id=1047

My only disagreement is them using a 10k input pot.
Audio 100k would be much better.

It easily drives a small speaker, 2" plastic type is fine, or standard walkman/phone earphones