Voltage to Sound Help
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Voltage to Sound Help

 
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SS
Guest
Posted: Thu Oct 06, 2005 4:35 pm    Post subject: Voltage to Sound Help Reply with quote
Hi All

I have created an Ultrasonic TX and RX. Now I would like to convert the

output to an audible sound.

When an object gets closer I would like the tone get stronger and stronger.

Can someone pls tell me how I could do this. I checked the output of the RX

and it's Voltage increases as someone comes close by.

Thx

SQ

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Bob Stephens
Guest
Posted: Thu Oct 06, 2005 4:35 pm    Post subject: Re: Voltage to Sound Help Reply with quote
On Thu, 06 Oct 2005 12:07:44 GMT, SS wrote:

Quote:
Hi All

I have created an Ultrasonic TX and RX. Now I would like to convert the

output to an audible sound.

When an object gets closer I would like the tone get stronger and stronger.

Can someone pls tell me how I could do this. I checked the output of the RX

and it's Voltage increases as someone comes close by.

Thx

SQ

Of course. You insert tab 'A' into slot 'B' and push the blue button.

HTH


Bob
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Mike Berger
Guest
Posted: Thu Oct 06, 2005 4:35 pm    Post subject: Re: Voltage to Sound Help Reply with quote
You need a VCO (voltage controlled oscillator) circuit.

SS wrote:
Quote:
Hi All

I have created an Ultrasonic TX and RX. Now I would like to convert the

output to an audible sound.

When an object gets closer I would like the tone get stronger and stronger.

Can someone pls tell me how I could do this. I checked the output of the RX

and it's Voltage increases as someone comes close by.

Thx

SQ



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w2aew
Guest
Posted: Thu Oct 06, 2005 10:07 pm    Post subject: Re: Voltage to Sound Help Reply with quote
A simple peak detector can be used to convert the RX output to a
psuedo-DC value that is proportional to distance (amplitude detector).
This voltage can be used to drive a VCO or voltage-to-frequency
converter if you'd like to have the pitch change vs. distance. If you
really want volume vs. distance, then you'd have to have an oscillator
of some kind (to make the tone), followed by an audio amp whose gain
can be controlled via the aforementioned detected amplitude (via a FET
in linear region, or something like that).
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Bob Monsen
Guest
Posted: Fri Oct 07, 2005 12:35 am    Post subject: Re: Voltage to Sound Help Reply with quote
On Thu, 06 Oct 2005 12:07:44 +0000, SS wrote:

Quote:
Hi All

I have created an Ultrasonic TX and RX. Now I would like to convert the

output to an audible sound.

When an object gets closer I would like the tone get stronger and stronger.

Can someone pls tell me how I could do this. I checked the output of the RX

and it's Voltage increases as someone comes close by.


Gain R2/R3+1 28V
|\ |
.-o| \ |/
input---|>|---o-----o--' | | --o---|
| | .-| / | |>
| | | |/ [R2] |
[R1] --- | | |
| --- '--------o |
| | | =====
| | [R3] =====
| | | |
gnd ----------o-----o------------o-----'

The diode and cap keep track of the peak, and the resistor allows it
to fade over time.

The amplifier (the triangle) then amplifies the input by some amount
so that it varies from 0 to 28V. The NPN transistor follows the input,
and uses it to set the input voltage of a variable output piezobuzzer,
like one of the amseco PAL328 series, which will get louder as the
voltage across it increases. Mouser has them.

The amp can be any single-supply opamp that can handle 30V from Vcc to
Vee (perhaps an LM324?). A standard non-inverting feedback is probably the
best. Determine your maximum input voltage, minus a diode drop (use a
shottky diode for smaller drop) and set the gain so the output is 28V at
that voltage.

---
Regards,
Bob Monsen
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Bob Masta
Guest
Posted: Fri Oct 07, 2005 4:35 pm    Post subject: Re: Voltage to Sound Help Reply with quote
On Thu, 06 Oct 2005 12:07:44 GMT, "SS" <res196k8@verizon.net> wrote:

Quote:
Hi All

I have created an Ultrasonic TX and RX. Now I would like to convert the

output to an audible sound.

When an object gets closer I would like the tone get stronger and stronger.

Can someone pls tell me how I could do this. I checked the output of the RX

and it's Voltage increases as someone comes close by.

Besides the advice others have given, there is another
totally different approach: Use a mixer (multiplier) to
multiply the received signal by a local oscillator whose
frequency is (say) a few hundred Hz from the TX.
The output product contains components at sum and
difference frequencies, proportional to the original
amplitudes.

That way you not only hear the amplitude, but you
can hear doppler frequency shifts as well.


Best regards,


Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Home of DaqGen, the FREEWARE signal generator
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Jasen Betts
Guest
Posted: Fri Oct 07, 2005 4:35 pm    Post subject: Re: Voltage to Sound Help Reply with quote
On 2005-10-06, SS <res196k8@verizon.net> wrote:
Quote:
Hi All

I have created an Ultrasonic TX and RX. Now I would like to convert the

output to an audible sound.

When an object gets closer I would like the tone get stronger and stronger.

Can someone pls tell me how I could do this. I checked the output of the RX

mix it with a carrier 1000Hz below (or above) the frequency that drives the
ultrasonic transmitter. then rectify it and run it through a low pass filter

--

Bye.
Jasen
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Pat Deegan
Guest
Posted: Thu Oct 13, 2005 1:23 pm    Post subject: Re: Voltage to Sound Help Reply with quote
Hello,

On Fri, 07 Oct 2005 12:09:28 +0000, Bob Masta wrote:
Quote:
Use a mixer (multiplier) to
multiply the received signal

I've always been interested by the idea of using a mixer to play with the
sum of two frequencies but have never tried.

Can you provide some advice as to what to use? A quick search reveals
parts like the NE602 and NE612 as possibly useful components (though I
couldn't locate either at digikey) but I'm wondering if these aren't too
"high frequency" for uses in the Hz or KHz range.

Any advice?

TIA

--
Pat Deegan,
http://www.psychogenic.com/
Registered Linux User #128131
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DBLEXPOSURE
Guest
Posted: Thu Oct 13, 2005 4:35 pm    Post subject: Re: Voltage to Sound Help Reply with quote
"Pat Deegan" <news**NO_SPAM**@psychogenic.com> wrote in message
news:pan.2005.10.13.08.23.01.874740@psychogenic.com...
Quote:
Hello,

On Fri, 07 Oct 2005 12:09:28 +0000, Bob Masta wrote:
Use a mixer (multiplier) to
multiply the received signal

I've always been interested by the idea of using a mixer to play with the
sum of two frequencies but have never tried.

Can you provide some advice as to what to use? A quick search reveals
parts like the NE602 and NE612 as possibly useful components (though I
couldn't locate either at digikey) but I'm wondering if these aren't too
"high frequency" for uses in the Hz or KHz range.

Any advice?

TIA

--
Pat Deegan,
http://www.psychogenic.com/
Registered Linux User #128131


NE602 crosses to a NTE7164 http://www.weisd.com/store2/ntesemi/NTE7164.html

However, I cannot cross your NE612
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Rich Grise
Guest
Posted: Fri Oct 14, 2005 7:31 am    Post subject: Re: Voltage to Sound Help Reply with quote
On Thu, 13 Oct 2005 04:23:02 -0400, Pat Deegan wrote:

Quote:
Hello,

On Fri, 07 Oct 2005 12:09:28 +0000, Bob Masta wrote:
Use a mixer (multiplier) to
multiply the received signal

I've always been interested by the idea of using a mixer to play with the
sum of two frequencies but have never tried.

Can you provide some advice as to what to use? A quick search reveals
parts like the NE602 and NE612 as possibly useful components (though I
couldn't locate either at digikey) but I'm wondering if these aren't too
"high frequency" for uses in the Hz or KHz range.

Search some more. ;-)

Try "analog multiplier IC" or "ring modulator" or "balanced
modulator" or just plain "modulator" - you are talking about "mixing",
not just "summing", right?

Good Luck!
Rich
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Bob Masta
Guest
Posted: Fri Oct 14, 2005 4:35 pm    Post subject: Re: Voltage to Sound Help Reply with quote
On Thu, 13 Oct 2005 04:23:02 -0400, Pat Deegan
<news**NO_SPAM**@psychogenic.com> wrote:

Quote:
Hello,

On Fri, 07 Oct 2005 12:09:28 +0000, Bob Masta wrote:
Use a mixer (multiplier) to
multiply the received signal

I've always been interested by the idea of using a mixer to play with the
sum of two frequencies but have never tried.

Can you provide some advice as to what to use? A quick search reveals
parts like the NE602 and NE612 as possibly useful components (though I
couldn't locate either at digikey) but I'm wondering if these aren't too
"high frequency" for uses in the Hz or KHz range.

Any advice?

TIA

Par, I haven't looked into the parts you mention. Basically
what you want is a "Four-quadrant multiplier". There are
a lot of ways to implement this; traditionally it was done
with a diode bridge where you weren't worried about perfect
results, such as when the output was going to be filtered
anyway. Note that you get both sum and difference
components, and at audio frequencies they are hard to
separate with filters alone.

Best regards,


Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Home of DaqGen, the FREEWARE signal generator
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Jamie
Guest
Posted: Sat Oct 15, 2005 8:35 am    Post subject: Re: Voltage to Sound Help Reply with quote
Rich Grise wrote:

Quote:
On Thu, 13 Oct 2005 04:23:02 -0400, Pat Deegan wrote:


Hello,

On Fri, 07 Oct 2005 12:09:28 +0000, Bob Masta wrote:

Use a mixer (multiplier) to
multiply the received signal

I've always been interested by the idea of using a mixer to play with the
sum of two frequencies but have never tried.

Can you provide some advice as to what to use? A quick search reveals
parts like the NE602 and NE612 as possibly useful components (though I
couldn't locate either at digikey) but I'm wondering if these aren't too
"high frequency" for uses in the Hz or KHz range.


Search some more. ;-)

Try "analog multiplier IC" or "ring modulator" or "balanced
modulator" or just plain "modulator" - you are talking about "mixing",
not just "summing", right?

Good Luck!
Rich


LM1496



--
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
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Ben Bradley
Guest
Posted: Thu Oct 27, 2005 8:35 am    Post subject: Re: Voltage to Sound Help Reply with quote
On Thu, 13 Oct 2005 04:23:02 -0400, Pat Deegan
<news**NO_SPAM**@psychogenic.com> wrote:

Quote:
Hello,

On Fri, 07 Oct 2005 12:09:28 +0000, Bob Masta wrote:
Use a mixer (multiplier) to
multiply the received signal

I've always been interested by the idea of using a mixer to play with the
sum of two frequencies but have never tried.

Can you provide some advice as to what to use? A quick search reveals
parts like the NE602 and NE612 as possibly useful components (though I
couldn't locate either at digikey) but I'm wondering if these aren't too
"high frequency" for uses in the Hz or KHz range.

Any advice?

Poking around, it looks like those will work at any frequency.
This is also a "legacy" part, but without the built-in oscillator:

http://www.onsemi.com/pub/Collateral/MC1496-D.PDF

Here are digikey's part numbers for dip and SOIC:
MC1496POS-ND
MC1496DR2OSCT-ND

For the oscillator, use something with a sine-wave output. For
something cheap and simple, google for phase shift oscillator.

Quote:

TIA
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JosephKK
Guest
Posted: Fri Nov 11, 2005 9:35 am    Post subject: Re: Voltage to Sound Help Reply with quote
Pat Deegan wrote:

Quote:
Hello,

On Fri, 07 Oct 2005 12:09:28 +0000, Bob Masta wrote:
Use a mixer (multiplier) to
multiply the received signal

I've always been interested by the idea of using a mixer to play with the
sum of two frequencies but have never tried.

Can you provide some advice as to what to use? A quick search reveals
parts like the NE602 and NE612 as possibly useful components (though I
couldn't locate either at digikey) but I'm wondering if these aren't too
"high frequency" for uses in the Hz or KHz range.

Any advice?

TIA

The ones i have seen the specifications on go from DC up to as high 100's of

MHz. Just a minority go past 1 MHz. If you use "analog multiplier" in a
search engine you should get many part numbers and specification sheets.
Bandwidth trades off in cost and accuracy.
--
JosephKK
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