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Old 26th September 2012, 02:28 AM   #21
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nah i don't think a half a volt DC would ruin a subwoofer that can handle 14+ volts or more than 100 watts
a half a volt is like nothing
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Old 26th September 2012, 06:26 AM   #22
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Quote:
thanks it works great although I can't seem to make it sound clean
Because without proper bias, the transistor cannot cleanly reproduce the sine wave at its output.
"Bias" in electronics basically means "DC operating parameters, in the idle state." What needs to be done is to bias the transistor so that it can pass the complete positive and negative portions of the input waveform, ie we want it operating in the linear region of the transistor, not into saturation or cutoff. See what you can find out about "Q-point" (quiescent point) and "dc load line" for transistors.
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Old 26th September 2012, 07:21 AM   #23
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Dude, you're doing an output buffer. Here's an example: http://www.diyaudio.com/forums/chip-...er-transistors
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Old 27th September 2012, 01:57 AM   #24
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I fixed all of the problems now my amplifier has enough power to easily power a large 12 inch subwoofer
with perfectly clean sound output quality!
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Old 27th September 2012, 01:51 PM   #25
maxo is offline maxo  United States
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Quote:
Originally Posted by realflow100 View Post
I fixed all of the problems now my amplifier has enough power to easily power a large 12 inch subwoofer
with perfectly clean sound output quality!
can you share your list of parts and schematic ?
i want to make one for myself
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Old 27th September 2012, 07:09 PM   #26
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Originally Posted by realflow100 View Post
i think i can describe it better than i could draw a diagram so here goes..
the positive input wire goes to the base or pin 1 (lets lable the transistors leads pin 1 2 and 3)
and there is a resistor between pins 1 and 2
pin 2 goes to the positive wire of the power supply
the negative wire of the power supply goes to the positive speaker wire
and the negative wire of the speaker wire goes to the negative of the input. and the negative of the input goes to pin 3 of the transistor.
and there is a capacitor between the positive of the input and pin 1 of the transistor.

a little complicated but it works perfectly fine at only 6 volts four double A batteries.
trust me it won't work with any more or any less or it does weird things
(super heats the transistor or massive distortion if i take away one battery or add one more battery)
it works fine except for the amount of DC flowing to the speaker constantly wasting a bit of power
you must change the resistor to very high ohms in order to handle 12 volts and you must have a VERY BIG powerful transistor in order to handle the big amounts of heat! and a really big heatsink is also necessary!
but if your just using double a batteries it should be just fine
list of parts?
1: one transistor (try finding a darlington transistor they amplify much better)
2: one resistor
3: one capacitor

Last edited by realflow100; 27th September 2012 at 07:11 PM.
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