• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

cat deterrent, buzzer quietening

    Blog entry posted in 'cat deterrent, buzbuzer quietening cat deterrent,', May 11, 2015.

    I have a number of personal alarm buzzers, very loud and high pitched (could be piezo ) no details, no internal components,
    I would like to incorporate them into a cat deterrent,
    have considered ultrasonic and checked out circuits, (found them a bit heavy, just starting)
    I have run them at a lower voltage with some success.
    My question is,
    could I use a capacitor charged through a resister to create a pulse, to create a growl effect,
    am I being simplistic ?
    Limited on knowledge equipment and cash.


    Sinedup, June 12, 2018
    These "handbag anti-theft alarms" as I know them by, are usually a modular IC oscillator, meaning the surface -mounted components are encased with a blob of black epoxy, wired to a button-cell and piezo sounder. So modifying the circuit is not possible. Modulating the output with PWM at low frequency [i]may[/i] create a type of growl, but more likely a cicada-like "chirping", as "on" periods will still oscillate at 2KHz or so. Electronics component outlets (eg Radio Shack) often sell "Sound Effects" PCB circuits which come with ROMS having a variety of animal sounds. What about just using the loud piezo-alarm "as-is"? Or would this upset the neighborhood?

EE World Online Articles