[time-nuts] Using speaker / earphone for PPS testing (not a question)

[Bob kb8tq]

Hi

Well, actually it should work. You are doing an “impulse response” on the speaker. 
As long as it has a response in the audio range (which is a good bet), it should make
some noise. 

Bob

> On Apr 22, 2020, at 3:57 PM, Taka Kamiya via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Bob?  Are you making "Big Ben" out of your T-bolt?  
> 
> Really, my original post was meant to sort of show something interesting I happen to find.  Nothing serious.  Those really short pulse shouldn't be audible but most are.  I'm making a set of tools to quickly check my time sources.  That was for PPS.  (you know....  I'm behind a rack stepping over wires and trying to see if pps is actually coming out?) 
> 
> --------------------------------------- 
> (Mr.) Taka Kamiya
> KB4EMF / ex JF2DKG
> 
> 
>    On Wednesday, April 22, 2020, 2:16:17 PM EDT, John Moran, Scawby Design <john at scawbydesign.co.uk> wrote:  
> 
> Bob kb8tq - Wed, 22 Apr 2020 07:46:34 -0400
> 
> Said -
> 
>> 
> A lot also depends on what sort of voltage / power the speaker is expecting. 
> If it's a high impedance voice coil gizmo things aren't going to be as easy as
> with a piezo gizmo designed to work in a 1.3V battery powered greeting card. 
> 
> Where did I leave that 10KV output amplifier ?.. should be easy to find ?. :)
>> 
> 
> 10kV may be a little excessive for normal devices and ears.
> 
> However, Texas Instruments make some rather nice piezoelectric haptic drivers that include an on-chip boost voltage generator that can supply up to 200v to drive the piezo disc ... more than enough to drive someone mad after a few hours of 1PPS ticking in the cellar. The device is a DRV8662 and is available from Digikey for $3.35. It is a small-pitch device (0.5mm) but not impossible to solder.
> 
> I will order a couple and see how they perform. I think I have some 4kHz resonant piezo discs that should ring quite nicely ... even when hit by a narrow pulse ... at 200v.
> 
> Data sheet here -
> 
> http://www.ti.com/lit/ds/symlink/drv8662.pdf
> 
> There are a couple of other information sheets referenced at the end of the data sheet.
> 
> John 
> 
> 
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