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ultrasonic speaker simple amplifier

I

Infundibulum

Hi

I am using a simple 555 timer to create a 20khz + square wave feeding into
an 8 ohm super tweeter rated up to 40Khz. I'd like to raise the power
output on the speaker above what I get from the 555 timer pin 3 output.

I am using the tone generator circuit show here:
http://www.reconnsworld.com/audio_tonegenerate.html

Help on the output circuit to switch a power transistor with the speaker
would be appreciated.
 
D

D from BC

Hi

I am using a simple 555 timer to create a 20khz + square wave feeding into
an 8 ohm super tweeter rated up to 40Khz. I'd like to raise the power
output on the speaker above what I get from the 555 timer pin 3 output.

I am using the tone generator circuit show here:
http://www.reconnsworld.com/audio_tonegenerate.html

Help on the output circuit to switch a power transistor with the speaker
would be appreciated.

Maybe a split power supply + class C? push pull power stage.
IIRC..class C is without bias..
D from BC
 
M

mpm

On May 30, 5:03?pm, "Infundibulum" <[email protected]>
wrote:
?I'd like to raise the power
output on the speaker above what I get from the 555 timer pin 3 output.

You could try a National Semiconductor LM4950 audio amp.
Single supply, easy to hook up.
Gain is set with programming resistors.
Up to 7 Watts in bridge mono mode.

-mpm
 
R

Ross Herbert

Hi

I am using a simple 555 timer to create a 20khz + square wave feeding into
an 8 ohm super tweeter rated up to 40Khz. I'd like to raise the power
output on the speaker above what I get from the 555 timer pin 3 output.

I am using the tone generator circuit show here:
http://www.reconnsworld.com/audio_tonegenerate.html

Help on the output circuit to switch a power transistor with the speaker
would be appreciated.


If you are using your ultrasonic sound generator for deterring dogs
etc, a single tone may not be effective. A kit for a dog silencer as
shown here uses a multiple frequency pattern
http://secure.oatleyelectronics.com...d=272&osCsid=05d1223d6d2253396bc83925ea789a5b
and may be more effective and economical.
 
G

GregS

Hi

I am using a simple 555 timer to create a 20khz + square wave feeding into
an 8 ohm super tweeter rated up to 40Khz. I'd like to raise the power
output on the speaker above what I get from the 555 timer pin 3 output.

I am using the tone generator circuit show here:
http://www.reconnsworld.com/audio_tonegenerate.html

Help on the output circuit to switch a power transistor with the speaker
would be appreciated.

You will not get anything out until you apply a voltage source.

I have used 18 volts for this type circuit, two 9 volt batteries.

The piezo can take up to an equivalant 35 volts RMS
If there was a way to push pull two 555's, that would be nice.

greg
 
G

GregS

You will not get anything out until you apply a voltage source.

I have used 18 volts for this type circuit, two 9 volt batteries.

The piezo can take up to an equivalant 35 volts RMS
If there was a way to push pull two 555's, that would be nice.

You can also use a transformer. You can use a 9 volt sorce and take the output
to a Mosfet, and the mosfet can use 4 nine volt batteries, feeding the driver. A
modified follower can be used, with a high value resistor on the bottom leg.

greg
 
R

Rich Grise

I am using a simple 555 timer to create a 20khz + square wave feeding into
an 8 ohm super tweeter rated up to 40Khz. I'd like to raise the power
output on the speaker above what I get from the 555 timer pin 3 output.

I am using the tone generator circuit show here:
http://www.reconnsworld.com/audio_tonegenerate.html

Help on the output circuit to switch a power transistor with the speaker
would be appreciated.

Why do you want power at 20 KHz? Dog whistle? Sonic weapon? Phlogistonic
levitation?

If it's to annoy dogs, please don't do it. It's not right to punish a dog
for the negligence of its owners. If it's barking, use a water spray to
shut it up.

Thanks,
Rich
 
R

Rich Grise

If you are using your ultrasonic sound generator for deterring dogs
etc, a single tone may not be effective. A kit for a dog silencer as
shown here uses a multiple frequency pattern
http://secure.oatleyelectronics.com...d=272&osCsid=05d1223d6d2253396bc83925ea789a5b
and may be more effective and economical.

It's not right to punish a dog for the negligence of its owner(s).

If this is, in fact, about a barking dog, then make a tape recording of it
and play it back at them when _they're_ trying to sleep!

Cheers!
Rich
 
J

Jasen

You will not get anything out until you apply a voltage source.

I have used 18 volts for this type circuit, two 9 volt batteries.

The piezo can take up to an equivalant 35 volts RMS
If there was a way to push pull two 555's, that would be nice.

assuming you mean bridge, there is, hook trigger and threshold of b to the
ouput of A, and reset to vcc

Bye.
Jasen
 
R

Ross Herbert

It's not right to punish a dog for the negligence of its owner(s).

If this is, in fact, about a barking dog, then make a tape recording of it
and play it back at them when _they're_ trying to sleep!

Cheers!
Rich


Yeah, that'd be right...

That way the victim can get a double-dose of the annoying barking -
which I am sure is just what he is looking for.
 
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