Activation of a LED light with a 15MV signal

[Gilles Lafleche]

Hi,

For one my project, with the help of my ampere meter I want to
activate my LED light with a signal of 15MV/A.

However, I will have a 15MV at the end of one of my instrument,
therefore I dont know how to do it or activate it.

Thanks

 

[Jon Kirwan]

On Thu, 23 Dec 2010 18:57:11 -0800 (PST), Gilles Lafleche
<nicoc82@hotmail.com> wrote:

For one my project, with the help of my ampere meter I want to
activate my LED light with a signal of 15MV/A.

Can you describe your project? And by "ampere meter" do you
mean "ammeter?" Also, describe the LED light you have. Is
it a complete system, like a flashlight? Or just the part
itself; an LED with two leads sticking out?

Finally, 15MV/A is difficult to understand without any
context. Is the M for "million" as in 10^6? Or is it "m"
for "milli" as in 10^-3? And V/A would normally be
interpreted as "ohms." But it makes little usual sense to
consider a "signal" as being described in ohms.

However, I will have a 15MV at the end of one of my instrument,
therefore I dont know how to do it or activate it.

So you have some other instrument, also not described yet,
which has an output of some kind. Supposedly, that is the
signal you were talking about, earlier. And the output is
either 15/1000 of a volt or else it is 15*10^6 volts.

You really should write more about what you are doing and
with what. A lot more.

Jon

 

[George Herold]

On Dec 23, 10:07 pm, Jon Kirwan <j...@infinitefactors.org> wrote:

On Thu, 23 Dec 2010 18:57:11 -0800 (PST), Gilles Lafleche

nico...@hotmail.com> wrote:
For one my project, with the help of my ampere meter I want to
activate my LED light with a signal of 15MV/A.

Can you describe your project?  And by "ampere meter" do you
mean "ammeter?"   Also, describe the LED light you have.  Is
it a complete system, like a flashlight?  Or just the part
itself; an LED with two leads sticking out?

Finally, 15MV/A is difficult to understand without any
context.  Is the M for "million" as in 10^6?  Or is it "m"
for "milli" as in 10^-3?  And V/A would normally be
interpreted as "ohms."  But it makes little usual sense to
consider a "signal" as being described in ohms.

However, I will have a 15MV at the end of one of my instrument,
therefore I dont know how to do it or activate it.

So you have some other instrument, also not described yet,
which has an output of some kind.  Supposedly, that is the
signal you were talking about, earlier.  And the output is
either 15/1000 of a volt or else it is 15*10^6 volts.

You really should write more about what you are doing and
with what.  A lot more.

Jon

Hee hee, Jon you're trying to read tea leaves. My reading of the
title was that he wanted to turn it on with a 15 millivolt signal....
but that ended when I read the rest of the post.

George H.

 

[Jon Kirwan]

On Thu, 23 Dec 2010 20:17:56 -0800 (PST), George Herold
<ggherold@gmail.com> wrote:

On Dec 23, 10:07 pm, Jon Kirwan <j...@infinitefactors.org> wrote:
On Thu, 23 Dec 2010 18:57:11 -0800 (PST), Gilles Lafleche

nico...@hotmail.com> wrote:
For one my project, with the help of my ampere meter I want to
activate my LED light with a signal of 15MV/A.

Can you describe your project?  And by "ampere meter" do you
mean "ammeter?"   Also, describe the LED light you have.  Is
it a complete system, like a flashlight?  Or just the part
itself; an LED with two leads sticking out?

Finally, 15MV/A is difficult to understand without any
context.  Is the M for "million" as in 10^6?  Or is it "m"
for "milli" as in 10^-3?  And V/A would normally be
interpreted as "ohms."  But it makes little usual sense to
consider a "signal" as being described in ohms.

However, I will have a 15MV at the end of one of my instrument,
therefore I dont know how to do it or activate it.

So you have some other instrument, also not described yet,
which has an output of some kind.  Supposedly, that is the
signal you were talking about, earlier.  And the output is
either 15/1000 of a volt or else it is 15*10^6 volts.

You really should write more about what you are doing and
with what.  A lot more.

Jon

Hee hee, Jon you're trying to read tea leaves. My reading of the
title was that he wanted to turn it on with a 15 millivolt signal....
but that ended when I read the rest of the post.

Yeah, that's how I took the title, too. Almost didn't
respond after reading the post. Some lark made me do it.
We'll see if anything more happens.

Jon

 

[Bob Masta]

On Thu, 23 Dec 2010 18:57:11 -0800 (PST), Gilles Lafleche
<nicoc82@hotmail.com> wrote:

Hi,

For one my project, with the help of my ampere meter I want to
activate my LED light with a signal of 15MV/A.

However, I will have a 15MV at the end of one of my instrument,
therefore I dont know how to do it or activate it.

I'm guessing here that you have a 15 mV (millivolt) signal
that you want to use to turn on an LED. The most versatile
solution would probably be to use a comparator, which
compares the input signal to a reference level (which you
set with a couple of resistors or a control potentiometer)
and switches its output on when the input is above the
reference. The output from the comparator can then operate
the LED, either directly through a series resistor in the
case of an open-collector comparator, or it can toggle a
switching transistor to do it.

The only catch is that the comparator may need a different
suppy voltage (or voltages) than you have handy. Let us
know what you want to do in more detail, and we can give
more specific help.

Best regards,


Bob Masta

DAQARTA v5.10
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
Frequency Counter, FREE Signal Generator
Pitch Track, Pitch-to-MIDI
DaqMusic - FREE MUSIC, Forever!
(Some assembly required)
Science (and fun!) with your sound card!