Convert V to mV

[BobK]

OkNow i know it might sound crazy, but apparently it's possible

Could you post a link so we can see whether it is nonsense or you are just misinterpreting it?

Bob

 

[davenn]

Ok, ok. Here's the experiment i'm doing: To emit and receive a signal between the -70 mV and -80 mV range using pulsated LD's.

Now i know it might sound crazy, but apparently it's possible

That is the full description. That is why i wanted to convert 9v or some other source between -70 and -80 mV

your terms are all mixed up

you want to build a radio transmitter ?

what's a pulsated LD ? a Laser diode or something else ?

your voltage conversion thing is all mixed up ... there isnt anything that operates on -70 to -80mV and nothing much that would operate on even +70 to + 80mV

Laser diodes ... if that's what you meant, run of ~ 3 - 5 volts and require a special driver circuit for current control

Dave

 

[CDRIVE]

Yep, I did that. It was based on an actual cartoon of the same name that I saw at an animation festival.

Bob

Bob, I don't think I ever saw the ASCII version but I did see the cartoon which made me laugh! Animated ASCII? Wow, that must have been a bunch of coding!

I don't know any laser diode that operates from 80mV. I'm sure you have gotten something wrong - conceptually. If you want to measure a signal in the range of 80mV and transmit the measurement using laser diodes, you'll have to modulate the Laser diode current in a suitable manner and you will have to demodulate accordingly on the receiving end.

By what means ever you are going to transmit the signal: The larger the input signal, the better the transmission. Arbitrarily reducing an input of 9V to 80mV for transmission is contra-productive.

Why the hell to some nubes constantly do this? I'm talking about mystery posts where the OP gives us info in dribs and drabs but never gives us the whole damn picture! Hell, all he had to do is post the link or links where he got his brainstorm! Then we'd know if he's misinterpreting the article or the article is all smoke and mirrors. Uuugh!

Chris

 

[Harald Kapp]

Maybe this thread should be moved to the woo-woo section

 

[CDRIVE]

Maybe this thread should be moved to the woo-woo section

What does Steve call it? Ah, I think it's "The Nubies Secret Circuit Circus" section!

Chris

 

[Harald Kapp]

That's just an alias
Plus: That section is well hidden!

 

[Electro132]

I don't know any laser diode that operates from 80mV. I'm sure you have gotten something wrong - conceptually. If you want to measure a signal in the range of 80mV and transmit the measurement using laser diodes, you'll have to modulate the Laser diode current in a suitable manner and you will have to demodulate accordingly on the receiving end.

By what means ever you are going to transmit the signal: The larger the input signal, the better the transmission. Arbitrarily reducing an input of 9V to 80mV for transmission is contra-productive.

Ok, its not being transmitted on a laser diode. i was thinking along the lines of radio waves instead, like an antenna.

So the input is 9v then it gets converted to an output between -70 and -80 mV. This signal gets a wave form of its own with data placed on it (pulse peak/trough per second type of thing) and is then shot out through an antenna within the range of 10 km.

The receiver should receive this signal if it is attuned within -70 to -80 mV.

 

[davenn]

Ok, its not being transmitted on a laser diode. i was thinking along the lines of radio waves instead, like an antenna.

So the input is 9v then it gets converted to an output between -70 and -80 mV. This signal gets a wave form of its own with data placed on it (pulse peak/trough per second type of thing) and is then shot out through an antenna within the range of 10 km.

The receiver should receive this signal if it is attuned within -70 to -80 mV.

OK

then you are still musunderstanding/misusing terms when it comes to this -70 to -80mV
get away from these thoughts NEVER mention them again!! ... its only confusing you

for being able to transmit over 10 km is going to require a reasonable amount of power
( how much depends on both the frequency you want to use and if its a line of sight path or if its a blocked path ... blocked by trees, buildings etc)
a clear path and say 433MHz 0.5 Watt would be ample if a blocked path then you may need 5 to 10 Watts.
You should really be getting an amateur radio licence for transmissions with these power levels and over those sort of distances

so are you willing to study and sit your amateur radio operators exam ?
learning for your exam will teach you how much is required to achieve what you seem to be wanting to do

cheers
Dave

 

[davenn]

Electro

you have a big learning time ahead of you to find out about radio transmitters and receivers and how they work. There's a lot of knowledge and skill required to build radio gear. Something you obviously lack at the moment.
You need to find a amateur ( ham) radio club close to you and start attending. They are likely to offer training classes so that you can get your licence. They are also likely to have a library from which you can borrow books to help your learning.

cheers
Dave

 

[Electro132]

Could you post a link so we can see whether it is nonsense or you are just misinterpreting it?

Bob

Sure. Thank you for giving my project a chance. I have attached some pics of what i was studying.

Also i have come to understand that -80 mV is achievable though i need some help in doing so (see my work on one of the pics that has lines and circles)

 

[(*steve*)]

What you are looking at there (in the last slide at least) is the action of nerves.

They're not really electrical, although in operation they cause small potentials to be generated and they can be triggered electrically.

It's a very complex chemical signalling process where the movement of ions across cell boundaries causes the adjacent cell to react in the same way, passing a signal along.

This has almost nothing to do with radio. It is pretty much true that you can no longer control or receive sensory input from a severed limb.

This would possibly work over a distance of a kilometer if you found you had an arm or a leg that long.

 

[CDRIVE]

And BioMed electronics relate to a 10KM Laser, RF, or whatever transmitter how?

Have you ever received radio signals on your guitar?

Chris

 

[Electro132]

And BioMed electronics relate to a 10KM Laser, RF, or whatever transmitter how?

Have you ever received radio signals on your guitar?

Chris

OK let's step away from the LD for a second. I'll try to tell you the best i can about Biomeds and electronics. It can help people with disabilities in the brain once it has been unlocked. I've also attached a pic as a guide for you.

Firstly, dendrites collect electrical signals which is in between -70 to -80 mV and may have a conductance of 0.1 - 0.3. These are electrical impulses which pass along the nerve (Axon) after being converted into chemical signals in the Cell body (Neuron).

Now whilst inside the cell body this electrical impulse does stimulate sodium and potassium ions which in turn gives you - ta da - the chemical signal. This should be a healthy dose of sodium ions (positives) coming into the cell (neuron) and potassium ions (negatives) going out of the cell (neuron) if the electrical impulse received is between -70 to -80 mV.

However, if the wrong electrical impulse comes into the cell (above/below the range of -70 and -80 mV) then it is possible for the cell (neuron) to shrink or burst. Which in the wrong hands is quite dangerous.

Now after the cell process, it gets passed onto the beginning of the nerve (axon hillock) and then the nerve itself (axon). This conducts excitation and the 'Myelin' protects the electrical impulse from dissipating. So you can say the Myelin coating around the axon acts like the coating wrapped around your fiber optic cables for your internet.

It then gets sent to the telondendritic zone (output) where it gets transmitted onto the next synapse (Input) of the next Cell (neuron) where the process starts all over again.

And no i haven't received radio signals on my guitar but my guitar does have a tone and volume adjustment which can be turned/hacked into and converted into a signal wave transmitter.

 

[CDRIVE]

While all quite fascinating I still see no connection to your post title or description of goal. Where does Laser or RF transmission come into the equation?

You're obviously intelligent, so I can't help but surmise that you're intentionally withholding vital information.

Chris

 

[Electro132]

While all quite fascinating I still see no connection to your post title or description of goal. Where does Laser or RF transmission come into the equation?

You're obviously intelligent, so I can't help but surmise that you're intentionally withholding vital information.

Chris

Thanks but that's where i need help in, trying to find out what is the best way of transmitting it. I was thinking radio waves would do as they are fitted with a carrier and signal which becomes rapid the more shorter the wavelength, or a LD which signal and carrier can be altered depending on the pulse p/s.

 

[BobK]

Enough of this nonsense. How about telling us what it is you are trying to do? And I don't mean transmitting a -70mV signal over 10km. That makes no sense. What is the ultimate goal of your efforts?

Bob

 

[Electro132]

While all quite fascinating I still see no connection to your post title or description of goal. Where does Laser or RF transmission come into the equation?

You're obviously intelligent, so I can't help but surmise that you're intentionally withholding vital information.

Chris

Thanks but i'm not trying to hide anything. This is just a theory and as with all theories, i am expecting alot of doubters and confused looks, Anyway that's where i need help in, trying to find out what is the best way of transmitting the info. In this case, i have only come up with two at the moment which, through research, is RF transmission and LD. Unless there is another i'll have to narrow down the search.

I was thinking radio waves would do as they are fitted with a carrier and signal which becomes rapid the more shorter the wavelength, or a LD which signal and carrier can be altered depending on the pulse p/s. The reason why is that there are 2 ways of obtaining this mV range:

1 - Changing the voltage and its components
2 - Changing the wave form (as in changing the pulse per second on each peak/trough)

 

[Electro132]

Enough of this nonsense. How about telling us what it is you are trying to do? And I don't mean transmitting a -70mV signal over 10km. That makes no sense. What is the ultimate goal of your efforts?

Bob

Ok if it is not clear to you, then i didn't represent my way of thinking properly and i apologise for that. My goal is simple: to get a waveform within the range of -70 to -80 mV transmitted.
That's all.

I know i had said LD at the start but now that i've done some further research i realized that radio waves and digital waves might also be an option. (see the diagram)

Its kind of complicated but it is a good challenge, after all if we could transmit a signal to astronauts in space, i'm pretty sure we (as people) can find a way to achieve transmitting on -70 to -80 mV.

I reckon the best method is to experiment on how many pulses are in a second or to alter the peaks and troughs. After all as you can see in the diagram, there is a spike before a long streak which only means there is a couple of cycles in that one spike.

 

[davenn]

electro132,
its already been explained to you that trying to transmit at -70 to -80mV
is meaningless. If you dont want to listen to what you are being told then there's not much anyone can do for you

Im going to close this thread, cuz its just going around in circles because of your refusal to listen and its just wasting everyone's time.
If and when you finally realise the problems of what you are saying wrong. start another thread with some clear thoughts and questions and we can go from there

cheers
Dave

 

[(*steve*)]

My guess is that he has sensors on someone that pick up the small electrical signals from a person and he wants to transmit them to a remote receiver.

Perhaps he wants to monitor his heart rate remotely?

If that is the case, the first thing he wants to do is AMPLIFY the small signal he gets, not use a voltage divider to drop his battery voltage to the same magnitude.

Once he has amplified it he can do various things, perhaps the simplest is to use it to modulate a carrier and then transmit the signal via AM to a remote receiver.

If I am right concerning what he is trying to do, the person will probably have to carry a reasonably powerful transmitter and/or a reasonable size antenna.

The size/weigh of each could be reduced if either/both ends could use directional antennas, higher frequencies, and be assured of no impediments to line of sight and possibly some form of tracking. But I don't think that can be guaranteed.