Re: ultrasonic speaker simple amplifier

In article <f3mfcl$iv4$4@xxxxxxxxxxxxxxxxxxxxxxxxx>, szekeres@xxxxxxxx (GregS) wrote:
In article <yEl7i.315151$ZA5.228316@xxxxxxxxxxxx>, "Infundibulum"
<Infudibulum@xxxxxxxxxxxxxxxxxx> wrote:
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.

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
.

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