There are two kinds of electrical experiment boxes in the electric laboratory now ,but the power supply of the two kinds of electrical experiment boxes exsit weakness , they can not complete all kinds of experiments , so the power supply of the two kinds of electrical experiment boxes do not attain the requests ; And when occurring short circuit,the power supply can not alarm , even will take place a accident . This design overcomes the above shortages,can output ±5V D. C. and 0~±18V D. C. when the experiment is needed.When occurr short circuit,the power supply will be alarming, increases the safety of the equipments.
Keywords: D. C. power supply;Short-circuit protect;Sound and light alarm;Reset