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简单的光开关电路,Simple optical switch

发布时间:2014-12-04 08:19:28  来源:大电流电感厂家   查看:

简单的光开关电路,Simple optical switch

Introduction
The 555 is proved to be the most versatile and ubiquitous IC all over the world.This is a possible use: simple inverting schmitt trigger.

Circuit exp差模电感器lanation

When the phototransistor is stroken by IR light it conducts and the voltage between the 1Mohm resist一体电感or(arbitrary) and the phototrans drops from VCC to lower values. When the voltage drops lower than VCC/3 the 555 is triggered and goes high (from 0 TO VCC). The amount of light that strike the phototrans necessary to bring his collector to VCC/3 is determined by the resistor (Vdrop = Icollector * R , so , if Vdrop= 2*VCC/3, the resistance needed to set the threshold on current is R=2*VCC/(Icollector*3)). High sensibility phototrans would need a smaller resistor, and weaker phototransistors higher value resistor, you can also use a trimmer to set the on threshold level with precision. The time of phototransistor isn't critical. The 555 has high current capability and can drive various devices, such as Bipolars, relays, bipolars+relays, mosfets, mosfets + totem pole , or give a logic output (see pic).

In case you need to trigger something when the gate is blocked (for example a burglar alarm, or a multistage coilgun) you need to invert the output, which is accomplished using a small bipolar trans电感生产istor wired in an inverting setup (see pic)磁心电感器 or swapping the positions of phototransistor with the resistor, so the voltage will drop under VCC/3 when blocked: The formula to determine the resistance to turn off at Icollector is R=VCC/(Icollector*3).

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电源方案选型要做个3节7号干电池供电的设备,需要转换成3.3V,请问用DC-DC转换可行吗?烦请大家推荐些高效率的DC-DC芯片啊?谢谢!满意回复+20yanwen217 查看完整内容负载电流要多少?1A?2A还是几百mA?负载电流大用DC-DC,效率最高可以到95%吧,看负载;如果负载电流工作时几个mA、其他大部分时间是休眠状态,可以选低静态功 ...负载电流要多少?1A?2A还是几百mA?

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专门,打错字了,
没有规模效益做不上去,公司做大了变臃肿了效率

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