2.2 Extensions for the TransistorTester2.2.1 Protection of the ATmega inputsFor better protection of the ATmega inputs one of the additional circuits 2.2 can be integrated. Thede-energized contacts of the relay protect the ATmega without power. The contacts will be opened bysoftware only for measurement. Also with the additional diode protection the chance of the ATmegawill be better to survive the connection of a capacitor with higher residual voltage. A completeprotection is not possible. Therefore capacitors should always be discharged before measuring.