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  • Wire Break Sensor Alarm

    2014-11-23 21:15:1197

    Circuit of a loop sensor based simple security alarm is described here. The sensor loop is nothing but a short length of thin enamelled copper wire, wh...

  • 10MHz TO 20MHz LASER LIGHT DETECTOR

    2014-11-23 20:40:2079

    This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system. It has good ambient light immunity. vi...

  • Temperature Sensor Project - Quozl (DS1820)

    2014-11-23 20:26:3683

    This article describes the Temperature Sensor Project - Quozl (DS1820). The content is very simple, very helpful. Components in this article can help y...

  • Capacitive Sensor Circuit Diagram

    2014-11-23 20:00:3797

    Special design for shop-windows animation, Useful for many types of touch controls The purpose of this circuit is to animate shop-windows by means of a...

  • Hook Sensor Loop Circuit

    2014-11-23 16:22:0169

    Here`s an effective for a temperature sensor to receive power from a 4-to-20 mA loop without actually affecting the loop current (see the figure). This...

  • Simple Metal Detector DIY

    2014-11-23 15:55:51257

    LED 1 will light and the buzzer turns on when the coil is changing inductance. The setup is easy, VR1 is adjusted ( away from any metal objects ) so th...

  • CURRENT_DRAIN_SENSOR

    2014-11-23 14:09:4771

    Current drawn bydome light when door is open or by ignition when turned on triggers current-sensing stages Q1 and Q2 to start 555 timer and apply power...

  • Acoustic Sensor

    2014-11-23 13:06:4776

    This acoustic sensor was originally developed for an industrial application (monitoring a siren), but will also find many domestic applications. Note t...

  • Touch-switch desk lamp circuit diagram

    2014-11-23 11:39:20170

    Touch-switch desk lamp circuitry is as below: It's divided into four gearsto control lamps. When it gets power and the lamp is not lit, touching the me...

  • Differential temperature measurement Circuit Diagram

    2014-11-23 11:11:30137

    The temperature difference between two points is often measured in many situations. For example, in water pump fan design and other designs, the impell...

  • Clap switch using timer 555

    2014-11-23 09:03:09330

    A single hand clap will be picked up by the electric mic which is coupled through C1 into the op amp IC1. The output of IC1 triggers the 555 IC timer I...

  • Cooling liquid level sensor circuit diagram

    2014-11-23 05:26:0271

    The cooling liquid level sensor circuit is shown in the figure.In 49 terminal of motor wiring harness's 5V power line, the voltage is detected too high...

  • The electric programmable gain amplifier circuit

    2014-11-23 00:36:5275

    In the figure is the electric programmable gain amplifier circuit which is used in amplifiers. AOI has a LDR whose central head is connected with the g...

  • STRAIN_GAGE_SENSOR

    2014-11-22 23:34:2374

    In this loop-powered strain-gage sensor application, a 50-mV full-scale(FS)bridge output is amplified and calibrated for a 4-20-mA transmitter output. ...

  • Emergency Pump Control with 555

    2014-11-22 22:58:24130

    A simple Sump Pump Control Circuit using NE555. visit page....

  • Light-Dependent Sensor For Multiple Inputs Circuit

    2014-11-22 22:22:1072

    This light-dependent sensor uses LDRs to detect the presence or absence of light. As long as the light source striking the LDRs remains constant, the a...

  • IONIZATION_CHAMBER_SENSOR

    2014-11-22 21:57:5497

    MOSFET Q1 with high input impedance monitors voltage level at divider formed by R1 and ionization chamber, with output of Q1 going to Q2 which forms ot...

  • Object Motion Direction Identification Circuit

    2014-11-22 21:35:5487

    Place two objects of similar resistance and performance on the same side of the object motion path, with an appropriate distance from each other. The r...

  • Home Brew Compass Sensor CIRCUIT (LM317)

    2014-11-22 20:48:3176

    Background The goal was to make a compass sensor compatible with the RCX and have it only take one sensor input port to take a compass reading. We deci...

  • Fast_12_bit_A_D_converter

    2014-11-22 19:49:5167

    This circuit shows a DAC and comparator that is used with an SAR to form a 12-bit A/D converter. The analog input (0 to +10 V) is applied at the 4805 c...

  • Call finder circuit

    2014-11-22 18:20:0273

    The work principle of the circuit: in the circuit, J1 is connected to the telephone line. When there is no call in, Vcc is 0V for there is no ringing s...

  • Hi-lo temperature sensor

    2014-11-22 17:51:5278

    Resistors Rl, R2, and the two 2.2 k resistors form a bridge circuit. R2 is a thermistor, and Rl sets the temperature at which L2 lights. Lower or highe...

  • light or temperature Sensor Activated Relay Pulser

    2014-11-22 16:58:4385

    A Light Sensor generates an output signal indicating the intensity of light by measuring the radiant energy that exists in a very narrow range of frequ...

  • 4-20mA Current Loop Bridge Sensor Transmitter CIRCUIT (LM135

    2014-11-22 16:17:34101

    This article describes the 4-20mA Current Loop Bridge Sensor Transmitter CIRCUIT (LM135). The content is very simple, very helpful. Components in this ...

  • Current sensor measures 0 to 500A

    2014-11-22 15:52:0686

    The simple circuit in Figure 1a can sense both low and high current levels without low sensitivities or loss of accuracy either at the low or the high ...

  • MANUAL_CONTROL_FOR_HEATER

    2014-11-22 15:41:0477

    Built around an LM339 quad comparator, this circuit provides manual control of the output of a resistive heater or other load with a long time constant...

  • Temperature Drift Compensation Circuit

    2014-11-22 14:30:3183

    In order to solve the problem of temperature drift, for power supply on the electric bridge, it usually applies constant current source power supply.Ho...

  • Simple phase detector

    2014-11-22 13:10:53382

    The operation of the circuit is like an enabled inverter, that is, the output Y = B provided A is high. If A is low, output is low (independent of the ...

  • 10 channels sensor switch

    2014-11-22 12:42:5576

    Sensors A touch sensor switch circuit that works with 10 channels can be designed using electronic scheme in the figure below. If one of the 10 sensors...

  • Motion Sensor Switch for alarm, light or water sprinkler

    2014-11-22 08:53:05249

    The Motion Sensor Switch circuit is a motion sensor controlled automatic water sprinkler but you can easily add an alarm/light function too. Before beg...

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