For basic physical testing experimental work, it is a fact that the testing experimental apparatus with independent intellectual property rights developed slowly and the types are limited, So an experimental signal transmitter was designed, for electrical properties of rocks and minerals, which had logarithmic equidistant step and during spacing points encrypted as 2/3 frequency doubling, and its bandwidth was between 0.001Hz to 1 000 Hz and it was with optional multi-range constant-current output. After both laboratory experiment and analog experiments, the results showed that the signal source sends constant current and the accurate waveform frequency. In all, the transmitter can be used for practical experimental work.