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Old 3rd May 2013, 10:45 AM   #31
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Quote:
Originally Posted by frogq View Post
ok
so the ic plays the music and the transistor adds a lil more current to it
i notice that while i was looking at the diagram the music signal never flow through the transistors
hmmm is there way to make it so the sound passes through the transistors
while i was researchin amps i came across some small amp build diagrams i will post it when i get some time

Then in this case skip the all project and go for a real amplifier like the DX amplifier or P3A or sixtek amp and you get your shelf a real amp from both aspects IE quality of sound and power .

for the specific circuit and given the nature of the IC i see no other way to handle the external transistors but may others come with a better idea ... EFP them will need bias and other things

Kind regards
sakis ...
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Old 3rd May 2013, 01:28 PM   #32
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being that i am a beginner i think i should build this just i have all the parts to
i just doin some research can any 1 figure out at 24v how much watts i can get so i would know what
wattage speakers to use
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Old 3rd May 2013, 04:23 PM   #33
JMFahey is offline JMFahey  Argentina
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OK, build and test it, it will be fun
Stiff 24VDC? (you mentioned truck batteries): best case 19Vpp which divided by 2.8 yield 6.8V RMS= *almost* 6W RMS into 8 ohms or 12W RMS into 4 .

Just as a side note, adding the extra transistors adds nothing to power; such supply and loads are well within the unaided chip capabilities

Last edited by JMFahey; 3rd May 2013 at 04:25 PM.
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Old 3rd May 2013, 05:02 PM   #34
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ok ok
so this voltage does not bring in the transistors in effect ok ok
so what voltage will do this will give me maximum effect
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Old 3rd May 2013, 08:05 PM   #35
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by frogq View Post
ok ok
so this voltage does not bring in the transistors in effect ok ok
so what voltage will do this will give me maximum effect
No, it isn't that this voltage does not bring in the transistors in effect
, but
a) you won't have more peak voltage than your PSU allows.
b) they won't supply more current than your PSU allows and your load demands.
which in good English means:
they are not doing anything useful.

Not forgetting that *you* specified 24V PSU.
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Old 4th May 2013, 12:11 AM   #36
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lol yeah i know 24v is the voltage on the truck but when you start it the volt goes up to 28v so it swings from 24-28
hmm i am just asking so beginner questions
1, what if i add sum caps in parallel say 6 2200uf 35v to the power line before the input voltage stage of the amp will help boost the voltage up
also buy adding sumthing to only have that voltage flow 1 direction so it don't go back to the source
will it work what is a easy cheap way to do it
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Old 5th May 2013, 01:34 AM   #37
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frogq,
Capacitors won't raise the voltage the way you're thinking. If a capacitor is rated at 35V, that's the maximum voltage it's designed to withstand before failing--it won't raise a lower voltage to 35V.
Blocking the voltage flow will simply turn it off--nothing will flow.

If you want to raise the voltage, then you will need a DC-DC power supply. It would be a complicated project by itself.
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Old 5th May 2013, 07:25 AM   #38
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ok well i guess i will go with this an then move on
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