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 -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
