电工基础2026-03-07

音量指示器--Sound Level Indicator This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by

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电工基础2026-03-07

低功耗闪烁器电路--Low power blink led R1 = 4 mOhm D1 = Red Led 5mm    R2,6 = 10 mOhm T1 = BS170    R3 = 470 Ohm T2 = BC560B   R4 = 10 kOhm   T3 =   BC516    p5 = 680 KOhm P1 = 5 MOhm

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电工基础2026-03-07

通断温度控制电路--On-Off Temperature Control This circuit controls a load (in this case a dc brushless fan) based on a temperature compared with a setpoint. THe transduced is a diode in the forward

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电工基础2026-03-07

直流电动机可逆电路--DC Motor Reversing Circuit Description:A DC motor reversing circuit using non latching push button switches. Relays control forward, stop and reverse action, and the motor cannot

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电工基础2026-03-07

圆顶灯调光器电路--Dome Lamp Dimmer There are times when a little light inside the car would greatly assist one of the passengers but the dome light is too bright for safe driving. The dimmer circuit

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电工基础2026-03-07

LED或闪光灯电路--LED or Lamp Flasher Minimum parts counting Designed for 3V battery operation Parts:

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电工基础2026-03-07

双线灯闪光灯电路--Two-wire Lamp Flasher Ideal to operate 3 to 24V DC existing on-circuit lamps

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电工基础2026-03-07

礼貌灯电路--Courtesy Light 15 seconds delayed switch-off A good idea for bedroom lamps Parts: R1____________470R   1/2W ResistorR2____________100K   1/4W ResistorR3______________1M5  1/4W Resis

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电工基础2026-03-07

黑暗激活LED或灯闪光电路--Dark-activated LED or Lamp Flasher Simple photo-sensitive circuit3V battery supply

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电工基础2026-03-07

LED或灯序电路--LEDs or Lamps Sequencer Parts: R1______________1K5  1/4W ResistorR2____________680R   1/4W Resistor (Optional, see text)

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电工基础2026-03-07

便携式湿度计的实际电路 振荡器对电路提供交流电源。电桥的一臂为湿度传感器，由于湿度变化使湿度传感器的阻值发生变化，于是电桥失去平衡，产生信号输出，放大器可把不平衡信号加以放大，整流器将交流信号变成直流

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电工基础2026-03-07

欧姆定律电路   此电路适用于可以流经较大电流的陶瓷湿度传感器。由于测湿电路可以获得较强信号，故可以省去电桥和放大器，可以用市电作为电源，只要用降压变压器即可。其电路图如图。

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电工基础2026-03-07

带温度补偿的湿度测量电路    在实际应用中，需要同时考虑对湿度传感器进行线性处理和温度补偿，常常采用运算放大器构成湿度测量电路。下图为湿度测量电路中Rt是热敏电阻器(20kΩ，B=4100K)；RH为H204C湿度传感器

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电工基础2026-03-07

键盘和显示电路 　　如图6所示，由键盘电路和液晶显示电路两部分组成。液晶显示电路采用ZJM12864BSBD，这是一款低功耗的点阵图形式LCD，显示格式为128点(列)×64点(行)，具有多功能指令，很容易与MPU相连。其中键盘

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电工基础2026-03-07

可控硅调光灯电路-TRIAC Light Dimmer This little circuit can be used to dim lights up to about 350 watts. It uses a simple, standard TRIAC circuit that, in my expirience, generates very little heat.

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电工基础2026-03-07

红外线远程控制电路 Infa-Red Remote Control I have received a number of emails requesting schematics for infa-red remotes. So here is one. This remote transmits a tone using an infa-red LED. This tone

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