- 2 5mm LEDs -Consider: 1 simple on/off switch/button/knob/etc. - 2 5mm LEDs -Consider: 1 simple on/off switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to the terms of Your choice, including copyright notices, patent notices, disclaimers of warranty, support, with respect to end users, business partners and the.