Re: ultrasonic speaker simple amplifier
- From: szekeres@xxxxxxxx (GregS)
- Date: Thu, 31 May 2007 12:38:33 GMT
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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- From: Infundibulum
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- From: GregS
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