RaspiScope is extremely simple, using only one Operational Amplifier in each input and output. Input and output voltage ranges can be easily set with a few resistors.
Analog inputs
A single OP amp does the level shifting from negative voltages to voltage of 0 … 2.048V for the MCU to measure. Each OP amp has an offset setting resistor.
Analog outputs
A single OP amp does the level shifting from 0 … 3.3V from the MCU DAC output to +- 5V or +-15V depending of what you have configured and chosen with the jumpers. Each OP amp has an offset setting resistor.
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