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Old 12th October 2012, 06:24 PM   #31
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by padamiecki View Post
hi
mine is better, efective full class B with zero idle
but ac sims show hf oscillations
What are you trying to show with this ?
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Old 12th October 2012, 08:11 PM   #32
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Hmmm still nothing out of my speaker when I have the resistor and capacitor wired up like that.... am I putting them in the wrong place? where do they go exactly?

Last edited by realflow100; 12th October 2012 at 08:41 PM.
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Old 13th October 2012, 06:27 AM   #33
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by realflow100 View Post
Hmmm still nothing out of my speaker when I have the resistor and capacitor wired up like that.... am I putting them in the wrong place? where do they go exactly?
They have to go like I showed in post #22

Resistor R1 is the load resistor for the transistor. Resistor R2 has to be chosen so that the voltage on the collector is around half of the supply voltage. This allows the voltage to swing equally up and down and gives maximum output voltage swing. Also this resistor value will be different for every transistor and is a major limitation of the simple design. Resistor R3 is the speaker.
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Old 13th October 2012, 09:48 AM   #34
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Mooly View Post
This was the original as far as we know,
I finally made a good working transistor amplifier

we deduced the circuit from the point to point wiring description.

Do you not see the circuits in post 17 and 22 in this thread Andrew ? They are as close as we can get from the descriptions.
thanks for the link.
Yes, I can see those sims with their schematics. But I thought they were your amplifiers. I could not see any sch from realF.
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Old 13th October 2012, 12:45 PM   #35
willamp is offline willamp  United States
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Old 13th October 2012, 10:23 PM   #36
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I'm still confused on exactly where to put them... between which positive or negative and which emitter collector or base or other positive or negative?
sorry i'm such a noob still I'm still learning!
oh and I hooked up the 12 volt power supply and it bumps my subwoofer showing at least half inch excursion it's insane everything in my house is vibrating like crazy
it's showing what looks like at LEAST 25-55 watts!!
but the transistor gets super super hot (it almost burns my finger if I touch the top of the transistor but it doesn't burn my finger ... its just really super hot.... but I let it cool down for an hour so it doesnt burn out... I don't want to ruin my amplifier!
I'm totally confused on how to remove the DC from it without using a transformer...
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Old 13th October 2012, 10:34 PM   #37
sreten is offline sreten  United Kingdom
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Hi,

Reality will bite at some point and the nonsense in the thread title and OP become apparent.

Download this free emulator : SPICE-Based Analog Simulation Program - TINA-TI - TI Software Folder

And use it to post your schematic. Also post the Tina file for your schematic and some
kind soul might show you what it actually does (and doesn't) do, and how to modify it.

rgds, sreten.
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Last edited by sreten; 13th October 2012 at 10:44 PM.
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Old 13th October 2012, 10:58 PM   #38
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Okay I'll try that thanks
by the way I managed to run my amplifier off of salt and water battery!! (one single cell!)
it's a lil quiet but it actually visably moves my subwoofer! it doesn't put out more than one volt though but it still works!!
I can even run my amplifier off of a single capacitor. (it actually works slightly)
if I simply touch the power wires together I get a little static crackle but no real sound.
but if I just simply put them to a capacitor or in a salt water battery it really increases the power and actually amplifies my sound a bit!
really neat! a home made battery and a home made amplifier... together! that's new!
I'll see about the schematic now.
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Old 13th October 2012, 11:31 PM   #39
sreten is offline sreten  United Kingdom
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Hi,

I also found a 14MB version of "The Art of Electronics 1989 djvu file"
on a well known site, you'll need this free reader though to read it :

Free DjVu Reader | PDFlite

(I suggest declining all the optional installs it suggests).

My favourite book by a long way on the basics of electronics.

rgds, sreten.

search for "The_Art_of_Electronics_2ed.djvu"
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Last edited by sreten; 13th October 2012 at 11:39 PM.
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Old 14th October 2012, 12:24 AM   #40
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okay here's the schematic I drew up
Also it doesn't show the values because I don't know the values.
I only know the value of the capacitor going to the input so that's all i put in it.

It's not a working circuit in the program
all I did was just draw it out so I'm not sure whether it works in this circuit or not.
but it works in the circuit I made my amplifier in the real world.
this just gives a quick simple example of how I have my circuit wired up.
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