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
<j...@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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