Relating to chiral detection systems, various improvements are disclosed including an improved apparatus for detecting a chiral property of a sample. The received symbols are decoded assuming each possible rate, and then re-encoded to determine a symbol error rate for each possible rate. A focus lens unit is affixed to the projection lens unit of the main body to be movable in the direction of the optical axis by being rotated with the controller. Real instrument strings can be used, helping to strengthen a user’s fingertips and get the fingertips accustomed to holdingpinching the instrument strings. The executable code is then forwarded to the mobile device for execution. The additional control loop cooperates with the LDO regulator’s amplifier stage and output stage to maintain at least a minimum desired voltage drop across the output stage from the power supply to the load.