here is my chosen solution to have an autonomous theremin:
- a battery of sufficient capacity to play for at least 4 hours and powerful enough to accept the theremin, the KaossPad and Amp if needed.
- 220 volt converter to plug all devices in
- a charger for... charging the battery overnight
- all will be mounted on an aluminum plate.
the assembly shall not exceed 10 kg to be able to carry it in a backpack.