Power glitcher circuit for voltage fault injection. Similar to [1], it includes a DAC, a non-inverting amplification stage, and a push-pull follower output circuit.
The board can function as ON/OFF switch, bypassing the DAC, by connecting a GPIO output to the J5 connector and short-circuiting JP1. Refer to the schematic for more details.
[1] D. Oswald, A Versatile Framework for Implementation Attacks on Cryptographic RFIDs and Embedded Devices, 2010.