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Generate frequency on speakers

J

Jeffrey

Jan 1, 1970
0
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
 
P

Pooh Bear

Jan 1, 1970
0
Jeffrey said:
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
 
N

newtype

Jan 1, 1970
0
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.
 
J

john jardine

Jan 1, 1970
0
Jeffrey said:
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.
 
J

James Lehman

Jan 1, 1970
0
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. :eek:)
 
J

Jeffrey

Jan 1, 1970
0
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.
 
J

James Lehman

Jan 1, 1970
0
OK, buy one of those greeting cards with the little doohickey that plays
Jingle Bells.
 
R

Rich Grise, but drunk

Jan 1, 1970
0
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
 
R

Rob B

Jan 1, 1970
0
Pooh Bear said:
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.
 
S

Sjouke Burry

Jan 1, 1970
0
Rob said:
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.
 
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