[Amps] I'm not kidding: TL922

[Joe Subich, W4TV]

> I used to also be able to hear the 15 kHz sound from TV sweep
> oscillators.

  ... and the 19 KHz stereo pilot tone on FM receivers.

73,

    ... Joe, W4TV


On 2015-02-06 2:48 PM, Steve London wrote:
> 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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