Generate frequency on speakers

[Jeffrey]

I have a cheap speaker and a battery. What can I use to create a
steady tone, of let's say, 2500 Hz? Is there some kind of chip I can
use?

Jeff

 

[John Popelish]

Jeffrey wrote:

I have a cheap speaker and a battery. What can I use to create a
steady tone, of let's say, 2500 Hz? Is there some kind of chip I can
use?

You might do a Google search for [code practice oscillator schematic]
for things like this:
http://electronicsusa.com/o-2schematic.html
http://www.qrp.pops.net/multivibrator.htm

 

[Pooh Bear]

Jeffrey wrote:

I have a cheap speaker and a battery. What can I use to create a
steady tone, of let's say, 2500 Hz? Is there some kind of chip I can
use?

Many many kinds.

It requires more than 'just a chip' though.

Seems to me like the art of electronics design is being lost to those who
think there's a 'chip' that will do everything/anything and doesn't need
to have some circuitry designed around it.


Graham

 

[newtype]

Pooh Bear <rabbitsfriendsandrelations@hotmail.com> wrote in
news:43A4E4B4.EDA65BF2@hotmail.com:

Jeffrey wrote:

I have a cheap speaker and a battery. What can I use to create a
steady tone, of let's say, 2500 Hz? Is there some kind of chip I can
use?

Many many kinds. It requires more than 'just a chip' though.
Seems to me like the art of electronics design is being lost to those who
think there's a 'chip' that will do everything/anything and doesn't need
to have some circuitry designed around it.

Graham

1 hex inverter, 1 transistor? 2 xstrs ?, some caps and resistors.
The inverter & caps makes up an oscillator, the transistors amp
up the hex inverter output to the speaker.

try a 555 oscillator to the speaker.
try an opamp to the speaker.
look up multivibrator for 2.5 kHz.

 

[john jardine]

"Jeffrey" <johjeffrey@hotmail.com> wrote in message
news:1134872463.433186.284150@o13g2000cwo.googlegroups.com...

I have a cheap speaker and a battery. What can I use to create a
steady tone, of let's say, 2500 Hz? Is there some kind of chip I can
use?

Jeff

A minimum part solution (ie none) is to connect one lead of the battery to a

speaker terminal and the other battery lead to just touch the other speaker
pigtail wire. Gives an awfully loud square wave at about 1kHz. Bit like
tweeking a cats whisker.

 

[James Lehman]

In a similar way, you can use a battery, a speaker and a relay switch. When
the relay is powered, it opens the circuit. This should make a pretty nasty
buzz.

James. )



"john jardine" <john@jjdesigns.fsnet.co.uk> wrote in message
news:do4tt3$7k2$1@newsg1.svr.pol.co.uk...

"Jeffrey" <johjeffrey@hotmail.com> wrote in message
news:1134872463.433186.284150@o13g2000cwo.googlegroups.com...
I have a cheap speaker and a battery. What can I use to create a
steady tone, of let's say, 2500 Hz? Is there some kind of chip I can
use?

Jeff

A minimum part solution (ie none) is to connect one lead of the battery to
a
speaker terminal and the other battery lead to just touch the other
speaker
pigtail wire. Gives an awfully loud square wave at about 1kHz. Bit like
tweeking a cats whisker.

 

[Jeffrey]

A minimum part solution (ie none) is to connect one lead of the battery to a
speaker terminal and the other battery lead to just touch the other speaker
pigtail wire. Gives an awfully loud square wave at about 1kHz. Bit like
tweeking a cats whisker.

I am wondering is if there is a chip, of some sort, that will produce a
specific sound through the speakers, not some random noise.

 

[James Lehman]

OK, buy one of those greeting cards with the little doohickey that plays
Jingle Bells.



"Jeffrey" <johjeffrey@hotmail.com> wrote in message
news:1135090599.774683.86150@o13g2000cwo.googlegroups.com...

A minimum part solution (ie none) is to connect one lead of the battery
to a
speaker terminal and the other battery lead to just touch the other
speaker
pigtail wire. Gives an awfully loud square wave at about 1kHz. Bit like
tweeking a cats whisker.

I am wondering is if there is a chip, of some sort, that will produce a
specific sound through the speakers, not some random noise.

 

[Rich Grise, but drunk]

On Tue, 20 Dec 2005 06:56:39 -0800, Jeffrey wrote:

A minimum part solution (ie none) is to connect one lead of the battery to a
speaker terminal and the other battery lead to just touch the other speaker
pigtail wire. Gives an awfully loud square wave at about 1kHz. Bit like
tweeking a cats whisker.

I am wondering is if there is a chip, of some sort, that will produce a
specific sound through the speakers, not some random noise.

Yes, there are lots of them.

And what makes you think that making a buzz by having the speaker
interrupt its own voice coil current would be "random"? ;-)

Thnask,
Rich

 

[Rob B]

"Pooh Bear" <rabbitsfriendsandrelations@hotmail.com> wrote in message
news:43A4E4B4.EDA65BF2@hotmail.com...

Jeffrey wrote:

I have a cheap speaker and a battery. What can I use to create a
steady tone, of let's say, 2500 Hz? Is there some kind of chip I can
use?

Many many kinds.

It requires more than 'just a chip' though.

Seems to me like the art of electronics design is being lost to those who
think there's a 'chip' that will do everything/anything and doesn't need
to have some circuitry designed around it.

that seems to be a trend in any of the high-technology fields, about 10-15 %
with low level knowledge and design understanding where the other 85-90 %
are component users/tinkerers/builders.

 

[Sjouke Burry]

Rob B wrote:

"Pooh Bear" <rabbitsfriendsandrelations@hotmail.com> wrote in message
news:43A4E4B4.EDA65BF2@hotmail.com...


Jeffrey wrote:


I have a cheap speaker and a battery. What can I use to create a
steady tone, of let's say, 2500 Hz? Is there some kind of chip I can
use?

Many many kinds.

It requires more than 'just a chip' though.

Seems to me like the art of electronics design is being lost to those who
think there's a 'chip' that will do everything/anything and doesn't need
to have some circuitry designed around it.



that seems to be a trend in any of the high-technology fields, about 10-15 %
with low level knowledge and design understanding where the other 85-90 %
are component users/tinkerers/builders.




We used a pnp and a npn in a astable flipflop (advantage,both

tansistors open/closed at the same time.) running on a 4.5 flat
battery,and a small speaker as collecror resistor in one side.
the other side had the timer resitor and the plus battey connected
to 2 test leads. Makes a very nice audio resitance/voltage tester.
No on/off switch,battery stayed alive for about 4 years.
With the testleads open, both transitors remained closed,so only
leaking current.