Guru
Joined: 24/12/2017
Location: AustraliaPosts: 1692
| Posted: 11:26pm 15 Dec 2022 |
You could:
Add and extra cell just for the audio and use Phil's amplifier or:
Add another circuit the same as you have and drive it 180 degrees out of phase with the other then connect the speaker between the two outputs as in a 'bridge' amplifier.
Edit: Or use a boost regulator to produce a higher voltage for Phil's amplifier.
Bill
Edited 2022-12-16 12:11 by Turbo46