boylesg
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Can anyone recommend a simple complementary pair amplifier schematic for this particular application?
Sound quality is not an issue, i.e. it doesn't matter if there is a little distortion happening.
1) You're not going to get a sine wave out of a 555
2) Could you be just a LITTLE more specific about what you want?
What do you want, 100Watts? Why complementary pair? What are you driving?
You say "this particular application" and then present zero particulars.
"Small" error regarding order of magnitude: Circuit frequency is 17 kHz, not 17 Hz.
The circuit purpose isn't clear, but I would consider to "amplify" the square wave before the low pass filter.
Did you read my previous post? The circuit output is 17 kHz, no low frequency. A LC filter for 17 Hz would be very bulky, no good idea.I wanted to boost the current through the low frequency speaker
Did you read my previous post? The circuit output is 17 kHz, no low frequency. A LC filter for 17 Hz would be very bulky, no good idea.
It's probably better if you tell the intended purpose of your design so that people can make alternative suggestions.
This means unpredictable output voltage and very, very low 17Hz impedance.I have calculated my LC filter for a resonance of around 17Hz.
My 555 will be generating a 17Hz square wave and I have calculated my LC filter for a resonance of around 17Hz.
How should we know?
The idea doesn't make much sense either. To generate a 17 Hz sinewave of some quality, you'll use a different generator concept, or a more effective filter.
Due to human ears sensitivity curve, the harmonics will be perceived much louder than the fundamental. You really need good filters and a low distortion amplifier (in case there's no filter after the amplifier) to suppress the harmonics.
You could use a Wein-bridge oscillator to generate a sine wave. Or an FPGA or microprocessor DDS. Or use a triangle rather than square wave and filter that. (Triangle has lower amplitude harmonics). But you still haven't told us what you're driving. 17 Hz is below the nominal audio range. And you're going to need a large speaker.
Again, a 555 produces a SQUARE WAVE. The XR 8038 produces a 1% distortion sine wave. Which do YOU think would produce a better sinewave? You can certainly play around with a square wave and a filter, but why bother? Your original post said you didn't care too much about distortion.
Re not caring too much about distortion......except that it defeats my purpose if the 'victims' can hear the additional harmonics on top of the 17Hz infrasound.
I wouldn't worry too much about the distortion, or amplitude , or even the frequency if you are going to use one of the mentioned loudspeakers.
It's a diaphragm plate, it has no voice coil! They are designed to act as ABR (Auxilliary Bass Radiator) units in large loudspeaker enclosures to make use of existing low frequency sound pressure.
Fortunately a minimum of acoustic and electronic knowledge is required to make an effective infrasound source. No need to worry about your neighbor's health...
I wouldn't worry too much about the distortion, or amplitude , or even the frequency if you are going to use one of the mentioned loudspeakers.
It's a diaphragm plate, it has no voice coil! They are designed to act as ABR (Auxilliary Bass Radiator) units in large loudspeaker enclosures to make use of existing low frequency sound pressure. A kind of second bass speaker but using existing air pressure rather than producing any by itself. They work very effectively as ABRs but are of zero use as a sound source.
Brian.
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