[Amps] I'm not kidding: TL922

[Steve London]

When I was a kid, a local department store had some kind of ultrasonic 
alarm system that drove me nuts. I used to also be able to hear the 15 
kHz sound from TV sweep oscillators.

One of the advantages of growing up is not hearing these any more !

73,
Steve, N2IC

On 02/06/2015 12:14 PM, Mike Waters wrote:
> Somebody suggested having a young person listen for a very-high pitched
> sound. I think that's a very good idea indeed. Has that been tried yet?
>
> I know a teenage boy that can hear the 'ultrasonic' noise emanating from
> most cell phone and tablet screens, and at a considerable distance.
>
> 73, Mike
> www.w0btu.com
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