Robot Sound
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Posts: 46,084
A while ago someone had posted a cricket sound they created with their stamp.
Does anyone know about that?
Also any one have some neat sounds that they can make with their stamp?
Does anyone know about that?
Also any one have some neat sounds that they can make with their stamp?
Comments
stamps in order to controll waking-talking robot with lots of
effects. But I have a simple non-stamp problem.
I have a little children toy that takes normal voice and changes it
into robot like one. The unit works beautifully by itself. SO I
connected in parallel to the 8ohm (.5 watt) speaker and fed that
into one of the Radio Shack PA amps into one of the Mics inputs. It
works but I get a really loud buzz, as loud as the signal itself. I
think this is realted to "impedence matching". Again the units
works beautiflly by itself, and the Amp by itself does not produce
that buzz, only when the two are connected.
Any idea? Is there a good resource where I can learn about this?
Non of the electronic books and textbooks never talk about impedence
matching. Hope someone can help
Al
Have you de-coupled the signal between the amp and the sound module?
The impedance is probably not much of an issue since the input impedance on
the RS amp is probably very high.
---
Jeff Abrams
clavier@b...
SUPERCHARGED 2.5 liter 1993 Mazda MX-3 GS
http://www.mazdamaniac.com
TURBOCHARGED 1997 Mazda MX-5 Miata
Sometimes when I feel like killing someone, I do a little trick to calm
myself down. I'll go over to the persons house and ring the doorbell.
When the person comes to the door, I'm gone, but you know what I've left
on the porch? A jack-o-lantern with a knife stuck in the side of it's
head with a note that says "You." After that I usually feel a lot better,
and no harm done.
Original Message
From: brownstamp [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=RGcdr2XhfEvXE4BS6PAvXrJidch-a8f0gVWM9U0CTx0E9kVdwOI1z9gL-l4Z1YAwnR0eG7f0bHahfECM]brownstamp@y...[/url
Sent: Wednesday, December 19, 2001 10:17 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Robot Sound
I built a sofisticated robot with wireless units controlled by
stamps in order to controll waking-talking robot with lots of
effects. But I have a simple non-stamp problem.
I have a little children toy that takes normal voice and changes it
into robot like one. The unit works beautifully by itself. SO I
connected in parallel to the 8ohm (.5 watt) speaker and fed that
into one of the Radio Shack PA amps into one of the Mics inputs. It
works but I get a really loud buzz, as loud as the signal itself. I
think this is realted to "impedence matching". Again the units
works beautiflly by itself, and the Amp by itself does not produce
that buzz, only when the two are connected.
Any idea? Is there a good resource where I can learn about this?
Non of the electronic books and textbooks never talk about impedence
matching. Hope someone can help
Al
1]The Radio Shack amplifier is most likely a High impedance on the
microphone input and only needs a signal about -30 dbm to drive the
Amplifier to full output.
2] The output signal from your robot voice box may be 250 Mw.
3] The output impedance of the robot voice is most likely very low, 3 to 4
ohms
4] The hum/buzz can be the result of improperly connected ground return
signals from the power supply of the robot voice box and the Radio Shack
amplifier.
I suggest that you do the following.
5] look at the RS amplifier and see if there is a line input or tape input
or record player input available. Choose one of these as your new input to
the amplifier. Place a 1000 ohm resistor from the signal input to ground of
that input jack. Turn on the amplifier with all mic controls turned off and
the audio control for the phono /line input turned to about 10 o'clock and
the master gain control if equipped set about mid range. Listen to the
speaker output and the signal level should be silent or a slight hiss.
6[noparse][[/noparse] Look at the output terminals of the robot voice box and determine which
one is a common lead and which one is hot. The common lead will often be
connected to one side of the DC supply of the robot box. Connect this common
lead to the RS Amp line/tape input return line and there should be no
noticeable increase in the signal out put of the amplifier from the
speakers. If there is a hum/buzzpresent you have a ground current problem.
If you go this far and everything is OK find a 25K to 50K linear taper pot.
With the pot in the max resistance position connect between the Hot terminal
of the Robot Voice output and the hot input terminal of the amplifier.
This should get you in the Ball Park of an operating voice system. If you
need further assistance send me an e-mail.
Regards, Steve
Original Message
From: "brownstamp" <brownstamp@y...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, December 19, 2001 7:16 PM
Subject: [noparse][[/noparse]basicstamps] Robot Sound
> I built a sofisticated robot with wireless units controlled by
> stamps in order to controll waking-talking robot with lots of
> effects. But I have a simple non-stamp problem.
>
> I have a little children toy that takes normal voice and changes it
> into robot like one. The unit works beautifully by itself. SO I
> connected in parallel to the 8ohm (.5 watt) speaker and fed that
> into one of the Radio Shack PA amps into one of the Mics inputs. It
> works but I get a really loud buzz, as loud as the signal itself. I
> think this is realted to "impedence matching". Again the units
> works beautiflly by itself, and the Amp by itself does not produce
> that buzz, only when the two are connected.
>
> Any idea? Is there a good resource where I can learn about this?
> Non of the electronic books and textbooks never talk about impedence
> matching. Hope someone can help
>
>
> Al
>
>
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