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@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 > <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 > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
