Hi,
Its not difficult to knock up an oscillator with the classic 555 timer chip
that outputs a square wave at 22KHz. Minor extra circuitry to run the
whole thing off a 9V battery, as you only need a switching output to
drive the tweeter, i.e. you don't need an amplifier as such, just
switched 9V at 22KHz with enough current to drive the tweeter.
Long time since I did 555 stuff, you'll have to look it up, I
think an RC combo can be used to set the length of output.
rgds, sreten.
Its not difficult to knock up an oscillator with the classic 555 timer chip
that outputs a square wave at 22KHz. Minor extra circuitry to run the
whole thing off a 9V battery, as you only need a switching output to
drive the tweeter, i.e. you don't need an amplifier as such, just
switched 9V at 22KHz with enough current to drive the tweeter.
Long time since I did 555 stuff, you'll have to look it up, I
think an RC combo can be used to set the length of output.
rgds, sreten.
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