I would like to build this circuit which is an ultrasonic speaker (from this [YouTube video](https://youtu.be/AJ6hLpapgL4), skip to time 3:53 for the schematic, and also see the [designer's website](https://www.roboticskanti.com/post/high-frequency-sound-generator)) but I don't know what voltage and current rating I have to choose for the battery.

The regulator is a [L78S05CV](https://www.jameco.com/Jameco/Products/ProdDS/889461.pdf), the 555 is a NE555P. The transducers are similar to those found in proximity sensors, I would like to connect 6 in parallel.

The transducers get driven by a [L293D](https://www.ti.com/lit/ds/symlink/l293.pdf).

What's the operating voltage and current needed by this circuit? I need to choose an appropriate battery for it.

[![schematic](https://i.stack.imgur.com/krSek.png)](https://i.stack.imgur.com/krSek.png)