added circuit

The heating circuit using TL494 chip and PWM mode is realized.

5V的模拟电压信号,测量系统温度、硬件对传感器进行温度补偿,同时具有液晶显示和语音功能;加热电路用TL494芯片采用PWM方式实现,能实现脱机和联机两种不同的识别模式;以16位单片机MSP430F149为核心设计了硬件系统,用Visual Basic 6。

Fe2O3 series gas sensors and the heating circuit of sensor are introduced.

阐述了一种基于Fe2O3系列气体传感器阵列的电子鼻系统硬件实现方法及其系统的一般组成,介绍了Fe2O3系列气体传感器和传感器的加热电路。

The paper studied freguency and load characteristics of voltage doubler circuit of neutron pulses generator, discussed factors of affecting thease charaeteristics,and put forward for rule and method of chosing the best work point of the circuit.

研究了脉冲中子发生器倍加电路的频率特性和负载特性，讨论了影响这些特性的因素，并提出了选择最佳工作点的原则和方法。