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The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no bias current and be fully off. However... |
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这个栅极驱动电路由两级三极管组成：前级提供驱动场效应管栅极所需的正确电压，后级是一级射极跟随器，降低输出阻抗，消除栅极电容的影响。为了保证不共态导通，输入的边沿要比较陡，上述先延时再整形的电路就可以做到。
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电路中﹐C1﹑R1﹑压敏电阻﹑L1﹑R2组成电源初级滤波电路﹐能将输入瞬间高压滤除﹐C2﹑R2组成降压电路﹐C3﹑C4﹑L2﹑及压敏电阻组成整流后的滤波电路。此电路采用双重滤波电路﹐能有效地保护LED不被瞬间高压击穿损坏。
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Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-DC power supply. IC1a is a fast oscillator, and IC1b a slow oscillator, which are combined through... |
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是一个最简单的电容降压应用电路﹐电路中利用两只反并联的LED对降压后的交流电压进行整流﹐可以广泛应用于夜光灯﹑按钮... |
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This preamplifier has a low output impedance, and is desi... |
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The soft switching is enabled by a BD131 transistor wir... |
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The Keypad must be the kind with a common terminal and a ... |
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This is a complete alarm system with 5 independent zones ... |
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This switch will suit the Modular Burglar Alarm circuit... |
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This circuit features automatic Exit and Entry delays and... |
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This circuit will trigger with any fluid with a resistanc... |
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Q1、Q2的be结串联作为温度传感器，由精密稳压集成电路U3(TL431)提供约2.5V的高稳定基准电压源为传感器... |
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| 一种低成本高精度温度测量电路 用3DG6作为温度传感器，LM324运算放大器构成的测量放大电路见图1。晶体管3DG6置于测温现场其接成基极与集电极短路即发射结正偏，集电结零偏作为二极管使用来用作温度传感器，电源通过电阻R1(100K)向3DG6提供约45mA的集电极电流。其UBE连接到LM324的同相端，R1，R2，R3，R4均为普通金属膜电阻，选R2=R3则放大器输出U0≈2UBE。本仪器用2片... |
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Any number of normally open switches may be used. Fit the... |
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| Quadraphonic Amplifier This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels being directly con... |
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With reference to the above schematic, the two BC109C t... |
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