amplify audio signal from computer to higher voltage and cur

[simplesal]

I’m looking for away to amplify the audio signal coming from my
computer sound cards output.
I’m trying to amplify the output voltage to 31 volts and the output
current to 1.5mA can someone recommend a small amplifier to do the job
or a circuit that will do this for me.

I'm just trying to do some testing.

tia sal2

 

[Sjouke Burry]

simplesal wrote:

I’m looking for away to amplify the audio signal coming from my
computer sound cards output.
I’m trying to amplify the output voltage to 31 volts and the output
current to 1.5mA can someone recommend a small amplifier to do the job
or a circuit that will do this for me.

I'm just trying to do some testing.

tia sal2
Take a ~50W stereo amplifier, replace the speaker with 2

50 ohm resistors, and see how much voltage you get on the output.
No need to build something for some testing.

 

[sal2]

On Tue, 15 Jul 2008 00:11:44 +0200, jer0en wrote:

I think you went wrong on the proportions. you probably mean 31 KVolts
and 1.5ÂľA. you can test it quite comfortably on your tits.

That made me laugh hahahhaha becareful you don't want to singe your
nips ;-) no the specification are correct
output voltage 27 Volts to 31 Volts (from 54 Volts Peak-Peak, to 62 Volts
Peak-Peak). and
Output Current at : 1.0to 1.5 milliamps

 

On Jul 14, 2:08 pm, Sjouke Burry <burrynulnulf...@ppllaanneett.nnlll>
wrote:

simplesal wrote:
I’m looking for away to amplify the audio signal coming from my
computer sound cards output.
I’m trying to amplify the output voltage to 31 volts and the
output
current to 1.5mA can someone recommend a small amplifier to do
the job
or a circuit that will do this for me.

I'm just trying to do some testing.

tia sal2

Take a ~50W stereo amplifier, replace the speaker with 2
50 ohm resistors, and see how much voltage you get on the output.
No need to build something for some testing.

Right idea but might need a little more 'powerful' (higher voltage)
amplifier. One rated 100 or more watts into 8 ohms should do the
trick.

G˛

 

[Tom2000]

On Mon, 14 Jul 2008 14:59:54 -0700 (PDT), simplesal
<ratullochjk@gmail.com> wrote:

I’m looking for away to amplify the audio signal coming from my
computer sound cards output.
I’m trying to amplify the output voltage to 31 volts and the output
current to 1.5mA can someone recommend a small amplifier to do the job
or a circuit that will do this for me.

I'm just trying to do some testing.

tia sal2

A small audio amp, maybe even the one in your computer's speakers,
with one speaker replaced by a "70 volt" audio transformer, connected
backwards, to serve as a step-up transformer.

 

[John Fields]

On Mon, 14 Jul 2008 14:59:54 -0700 (PDT), simplesal
<ratullochjk@gmail.com> wrote:

I’m looking for away to amplify the audio signal coming from my
computer sound cards output.
I’m trying to amplify the output voltage to 31 volts and the output
current to 1.5mA can someone recommend a small amplifier to do the job
or a circuit that will do this for me.

I'm just trying to do some testing.

---
31 volts * 1.5mA is 46.5 milliwatts, so if your sound card puts out
more than that just connect a transformer to it with the turns ratio
selected to give the output voltage you want into the load.


JF

 

[Max65]

output voltage 27 Volts to 31 Volts (from 54 Volts Peak-Peak, to 62 Volts
Peak-Peak). and
Output Current at : 1.0to 1.5 milliamps

The output transformer is a good idea since the maximum power is just
46.5mW for a square wave signal, the problem is what frequency range
do you want handle on that output?

Tranformers have different bandwidths due to their construction
characteristics.

If the signal you want to handle with it is a complex wave (not a
simple sinusoidal one), computing the high frequency limit of the
transformer's bandwidth consider the signal's harmonics too.

Massimo

 

[Robert Baer]

stratus46@yahoo.com wrote:

On Jul 14, 2:08 pm, Sjouke Burry <burrynulnulf...@ppllaanneett.nnlll
wrote:
simplesal wrote:
I’m looking for away to amplify the audio signal coming from my
computer sound cards output.
I’m trying to amplify the output voltage to 31 volts and the
output
current to 1.5mA can someone recommend a small amplifier to do
the job
or a circuit that will do this for me.

I'm just trying to do some testing.

tia sal2

Take a ~50W stereo amplifier, replace the speaker with 2
50 ohm resistors, and see how much voltage you get on the output.
No need to build something for some testing.

Right idea but might need a little more 'powerful' (higher voltage)
amplifier. One rated 100 or more watts into 8 ohms should do the
trick.

G˛
...transformer??

 

[Max65]

   ...transformer??
Yea, transfomer.

Why do you wonder about?
From the WordWeb dictionary: "Transfomer: an electrical device by
which alternating current of one voltage is changed to another
voltage".
Since the low power required, despite the request of "amplify" the
signal, it's cheaper to convert the energy to higher voltage (reducing
the current) than use a more complex electronic circuit.

As previously stated, many aspects of the transformer to be used
depend on the required frequency range.

Massimo

 

[Robert Baer]

Max65 wrote:

...transformer??

Yea, transfomer.
Why do you wonder about?
From the WordWeb dictionary: "Transfomer: an electrical device by
which alternating current of one voltage is changed to another
voltage".
Since the low power required, despite the request of "amplify" the
signal, it's cheaper to convert the energy to higher voltage (reducing
the current) than use a more complex electronic circuit.

As previously stated, many aspects of the transformer to be used
depend on the required frequency range.

Massimo
I do not wonder about it; seemed that a number of responders did not

mention this obvious solution.

 

[Max65]

   I do not wonder about it; seemed that a number of responders did not
mention this obvious solution.

Yea, but if you read in detail my first message, I just pointed out
that the transformer solution should be evaluated under the frequency
response of the transformer.
I wrote that because Gerard Bok proposed:

With those requirements I would suggest to connect a simple mains
transformer, as found in many wall wards, in reverse to the
speaker output of your soundcard.
It should work right, but it could not because we don't know the

frequency and the shape of the wave to handle. ;-)

Massimo