US Patent 7635928 Drive control circuit and projection apparatus

A drive control circuit (100) performs drive control of a plurality of loads (111, 112) having different operating characteristics. The drive control circuit includes a plurality of connectors (106, 107) for connecting with the plurality of loads, a control portion (101) that supplies drive control signals to the plurality of loads via first electrodes of the plurality of connectors, and a comparing portion (110) that compares certain characteristic values at second electrodes concerning certain characteristics of signals applied to the first electrodes of the plurality of connectors and supplies a result of the comparison to the control portion, so that the drive control signals are decided in accordance with the result of the comparison.