Maker Pro
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Audio Amp

S

sahil

Jan 1, 1970
0
Hello friends .Its sahil wants ur help. I am currently using an audio
Amp of transistor 2N3055 .It uses two transistors for one channel
..Transformer is of 12-0-12 , 5A .I am not satisfied with the amp
performance.I want some what powerful amp schematic whose transistors
are easily available .I want to drive 12" SUB WOOFER. Hey I hope U are
the person Who can HELP me......Reply .........
 
M

Michael Black

Jan 1, 1970
0
sahil" ([email protected]) said:
Hello friends .Its sahil wants ur help. I am currently using an audio
Amp of transistor 2N3055 .It uses two transistors for one channel
.Transformer is of 12-0-12 , 5A .I am not satisfied with the amp
performance.I want some what powerful amp schematic whose transistors
are easily available .I want to drive 12" SUB WOOFER. Hey I hope U are
the person Who can HELP me......Reply .........
YOu asked this before, on Sept. 14. There were a fair number of
responses.

There is no reason to ask again until you've actually read the previous
responses.

Michael
 
J

Jamie

Jan 1, 1970
0
sahil said:
Hello friends .Its sahil wants ur help. I am currently using an audio
Amp of transistor 2N3055 .It uses two transistors for one channel
.Transformer is of 12-0-12 , 5A .I am not satisfied with the amp
performance.I want some what powerful amp schematic whose transistors
are easily available .I want to drive 12" SUB WOOFER. Hey I hope U are
the person Who can HELP me......Reply .........
you can buy them cheaper than making them..
if your using 12 volt system, you need an inverter to bump up
the voltage and a 2 or more channels bridge together driving the
lowest impedance speakers you can find.
---\
happy woofer thumping.
 
B

Bob Masta

Jan 1, 1970
0
Hello friends .Its sahil wants ur help. I am currently using an audio
Amp of transistor 2N3055 .It uses two transistors for one channel
.Transformer is of 12-0-12 , 5A .I am not satisfied with the amp
performance.I want some what powerful amp schematic whose transistors
are easily available .I want to drive 12" SUB WOOFER. Hey I hope U are
the person Who can HELP me......Reply .........

Hmm, do you mean one channel uses 2 x 2n3055, *plus* a
few other transistors? The best 2n3055 design I have used
is a pseudo-Darlington that uses a small PNP to turn one
2n3055 into a fake power PNP so you can have a push-pull
output stage. (The other 2n3055 uses a small NPN in a
normal Darlington.) The amp runs class AB. If you are
running your devices class A, then that is one area where
you are losing a lot of efficiency. On the other hand, as
others have noted, you need more volts to get more
watts, and running in bridge mode is best of all.

You can measure the output swing you are getting
to see if it is taking full advantage of your +/-12 supplies.
Note that for subwoofers you may need big supply caps
to handle low frequency current demands. If you can
swing +/-8 volts from one amp, that's pretty good.
You can then bridge two amps to get +/-16, which is
4x the power into a fixed load. Beyond that, you
just need more volts.

Best regards,


Bob Masta
dqatechATdaqartaDOTcom

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