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当安全帽的配戴者靠近带电物体一定距离(交流电220V 0.5m、880V 0.7m,1万至11万伏高压电约2～4m)时,安全帽内即发出“有电危险,请勿靠近”的柔和女性声音三遍。提醒操作者注意安全。从而有效地防止触电。若电路稍加改动,也可装在配电柜或变压器附近。当有人打开带电的配电柜或靠近变压器时,即发出危险警告。原理如图1所示,整个电路由50Hz选频网络、MOS-FET——双极晶体管达林顿电路。LED控制电路以及有声IC KD-8888构成。
When the helmets are close to the charged object at a certain distance (AC 220V 0.5m, 880V 0.7m, 10000 ~ 1100000 volt high voltage about 2 ~ 4m), the helmet will be issued within the “risk of electricity, please Do not get near ”soft female voice three times. Remind the operator to pay attention to safety. Thus effectively preventing electric shock. If the circuit is slightly modified, can also be installed in the distribution cabinet or transformer near. A hazard warning is given when someone opens a live distribution cabinet or near a transformer. The principle shown in Figure 1, the entire circuit by the 50Hz frequency selection network, MOS-FET - Darlington bipolar transistor circuit. LED control circuit and audio IC KD-8888 form.