RLC Divider Board was developed to implement passive filters and various R, L, and C networks, while Level Shifter Board is designed to interface I2C or SMBus signals between devices with different VDD voltages. Using OPA172 operational amplifier, OpAmp Board includes specific features that make it suitable for experimentation. Active Filter Board is suited for use as anti-aliasing filter for A/D conversion or as reconstruction filter after D/A conversion.