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  • Telephone line decibel meter and line voltage sensor

    2014-11-08 08:33:20136

    The UltraTek Telephone Line Analyzer combines the features of a transmission line tester, a 17 frequency multi-tone generator, and a multi range volt-o...

  • Light Barrier Detector

    2014-11-08 08:04:54131

    This simple circuit using a single transistor turns ON the relay when light falls on the LDR.The potentiometer is adjusted for the required sensitivity...

  • PIR. motion sensor alarm circuit (1N4148)

    2014-11-08 07:25:20340

    A motion detection alarm circuit using a PIR.SENSOR motion detection, if the move is a positive light from the PIR sensor, triggered by a delay circuit...

  • WATER_LEVEL_SENSING_AND_CONTROL

    2014-11-08 03:35:2488

    The operation of the circuit is based on the difference in the primary impedance of a transformer when its secondary is loaded and when it is open-circ...

  • Phase-sequence detector II

    2014-11-08 02:31:04413

    This circuit derives its supply voltage, Vcc and Vdd from Relay K1 energizes for correct phase volts....

  • Automatic_liquid_level_control_for_sump_pumps_water_storage_

    2014-11-07 23:34:3174

    Automatic liquid-level control for sump pumps, water storage tanks, swimming pools, animal drinking troughs, etc. This device can operate equipment to ...

  • Simplified-voltage-level-sensor

    2014-11-07 23:16:55109

    This circuit uses only one JC, either 1, LM393 dual comparator or 1/z, LM339 quad comparator. RV1 and RV3 set the full scale reference voltage, and RV2...

  • Pressure Sensor Alarm

    2014-11-07 21:11:1081

    General purpose circuit of the simple pressure sensor alarm is built around a couple of readily available cheap components. Working of this circuit is ...

  • Temperature-Sensitive Diode Application Circuit

    2014-11-07 20:17:4678

    The circuit shown in the picture is the digital temperature meter circuit which uses temperature-sensitive diode as the temperature-measurement element...

  • Buffering TMP01 Temperature Sensor

    2014-11-07 18:37:0771

    This is a buffer circuit for TMP01 Temperature Sensor. The output of this sensor is a low impedance dc output voltage with a 5 mV/K temperature coeffic...

  • Infrared sensor high voltage dangerous voice warning circuit

    2014-11-07 17:35:4177

    Pyroelectric infrared sensor head is same with the figure. When it detects the human body infrared signal in guarding zone, the sensor head will output...

  • Street Light Electronic Diagram using Photo Electric Sensor

    2014-11-07 13:54:5681

    This article describes the Street Light Electronic Diagram using Photo Electric Sensor (MAX7400ESA). The content is very simple, very helpful. Componen...

  • TEMPERATURE_TO_FREQUENCY_CONVERTER_CELSIUS

    2014-11-07 13:09:3774

    The 1.00-V reference output can be combined with the 1-mV/°K output to realize various temperature scales. For the Celsius scale, the lower end of the...

  • Fluid Sensor Limiter with MC14093B

    2014-11-07 12:35:58105

    A nice and small Fluid (water) sensor circuit that drives a relay for every use that comes to your head :) You do not need pcb because the circuit is t...

  • The auto light control circuit of photoelectric couplers

    2014-11-07 12:07:4865

    See as the circuit, in the 4 teams of analog electric switches(SI~S4), S1, S2 and S3 are in parallel connection, and they are used in the time delaying...

  • Temperature sensor for PC CIRCUIT (MAX232)

    2014-11-07 10:39:1990

    This article describes the Temperature sensor for PC CIRCUIT (MAX232). The principle is very simple, very practical. The circuit components can help yo...

  • Water sensor alarm

    2014-11-07 09:28:5474

    This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an applic...

  • A Precision bright light control circuit

    2014-11-07 08:54:5568

    The circuit shown is a precision bright light control circuit. Its work will not be affected by power supply voltage and ambient temperature. Resistors...

  • optical coupling V/F converter circuit

    2014-11-07 08:07:3972

    This circuit can convert 0~10V input voltage into corresponding frequency from the output end of optoisolator.When Convertor RM4151 and quad operationa...

  • Pressure Sensor Alarm(PMM8713)

    2014-11-07 06:19:47102

    This article describes the Pressure Sensor Alarm (PMM8713). The principle is very simple, very practical. The circuit components can help you understan...

  • TRANSISTOR_SENSOR

    2014-11-07 05:08:1473

    Use of bipolar supply for opamp makes electronic thermometer circuit fully linear even at low temperatures. Accuracy is within 0.05°C. Zero point is s...

  • SIMPLE_INTERCOM_FOR_NOISY_ENVIRONMENTS

    2014-11-07 05:03:4579

    This intercom was originally designed for motorcycle to passenger communications A simple"passenger-to-pilot”ttercom circuit is shown. Two LM386 IC...

  • Mutiple Output Crystal Oscillator Circuit

    2014-11-07 03:40:3768

    As shown in the figure is a multiple output crystal oscillator. It is mainly composed of 3 gates of Al, four resistances, two capacitances and a piece ...

  • Electronic thermometer(2)

    2014-11-07 00:19:3387

    The temperature measuring range of this electronic thermometer is 0-50℃, the precision is 0.1℃, the measurement results are intuitively displayed b...

  • Infrared (IR) Proximity (Distance) Sensor CIRCUIT (MAX4230)

    2014-11-06 22:35:14517

    The photodiode can be used to detect IR reflected from the object. However, IR produced by the ambient conditions also detected by the photodiode. This...

  • How to build Capacitive Sensor Circuit Diagram

    2014-11-06 21:34:1779

    Description The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is p...

  • Characteristics and Performance of The MORES-Sensor

    2014-11-06 21:19:2773

    The MORES (Micro-optical Remissions/Reflection Sensor system)is a device used to measure the intensity response of a surface caused by radiation with a...

  • BFO metal Detector Circuit with IC 4093

    2014-11-06 20:02:10230

    The circuit incorporates two oscillators, both operating at about 40kHz. The first, IC1a, is a standard CMOS oscillator with its frequency adjustable v...

  • 800_W_LIGHT_DIMMER

    2014-11-06 18:57:1178

    This wide-range light dimmer circuit uses a unijunction transistor and a pulse transformer to provide phase control for the TRIAC. The circuit operates...

  • A brief overview of Allegro ACS712 current sensor. Part 2 -

    2014-11-06 18:35:24183

    Part 1 - Theory In the first part of this discussion, the features of ACS712 device were briefly discussed. Now we will use that theory to implement th...

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