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

[Taka Kamiya]

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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