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  • Touch switching 12V Light

    2014-11-27 05:00:47148

    The circuit on the right uses three bipolar transistors to accomplish the same result with the touch contact referenced to the negative or ground end o...

  • Data Line Remote Short Sensor

    2014-11-27 01:20:0169

    Sensing short circuits in equipment that performs under water is especially critical, but Fig. 20-4`s wet-mat e connector design also suits other remot...

  • Infrared Light Train Detection

    2014-11-26 21:57:44156

    This page presents information on infrared - `Across The Track` train detection circuits. The circuits are designed around the LM339 comparator chip an...

  • Water Activated Alarm

    2014-11-26 18:40:33179

    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...

  • BASIC_DIGITAL_THERMOMETER_KELVIN_SCALE_WITH_ZERO_ADJUST

    2014-11-26 16:07:2276

    This circuit allows zero adjustment as well as slope adjustment. The ICL8069 brings the input within the common-mode range, while the 5 K pots trim any...

  • pressure sensor application circuit

    2014-11-26 14:48:0687

    MPX2100 pressure sensor typical application circuit is as shown in the picture. RP1 in thepictureis used for full-scale adjustment, RP2 is used for zer...

  • AUDIBLE_LIGHT_SENSOR

    2014-11-26 13:55:3277

    741 opamp is connected as audio oscillator with Radio Shack 276-677 photocells in feedback circuits. When light strikes PC1, its resistance decreases a...

  • UV sensor contour circuit

    2014-11-26 13:49:1577

    The structure of UV sensor is as shown in the picture. (a)the top structure, (b) the horizontal structure. In the quartz glass tube there are two elect...

  • Simple metal detector with 4011

    2014-11-26 13:35:01268

    This simple metal detector requires only a handful of components and an evening's work. Built around a cmos4011 IC, is very robust and versatile. The 2...

  • Motion detection circuits for toys

    2014-11-26 11:24:10199

    The doggy had a photocell in his nose so that when you cast a shadow or put your hand near he would bark and spin his tail. The photoelectric sensor ci...

  • Interfacing MPXV5100 pressure sensor to Atmega8

    2014-11-26 09:40:47314

    The MPX5100 series piezoresistive transducer is a state-of-the-art monolithic silicon pressure sensor designed for a wide range of applications, but pa...

  • CRYSTAL_OVEN_1

    2014-11-26 07:21:5075

    Thermistor RT1 senses temperature of crystal oscillator cavity and modifies output of asymmetric free running mvbr Q3-Q4 whose output is integrated by ...

  • Low-cost-humidity-sensor

    2014-11-26 06:22:51136

    The sensor is an RC oscillator in which, a water-absorbent plastic film is the insulator in the capacitive element. The capacitance of the film increas...

  • The typical application circuit of photoelectric couplers in

    2014-11-26 03:03:3071

    By fixing photoelectric couplers in audio amplifier circuits, not only the signals can be separated and the noise between stages can be impeded, but th...

  • Bridging Touch Plate Sensor Circuit

    2014-11-26 01:31:4075

    In This circuit, two 567 tone decoders are used. One is an oscillator, the other is a detector. Bridging TP1 and TP2 causes U2 to receive Ul`s signal, ...

  • The 2.5L motor data sensor, heating oxygen sensor circuit di

    2014-11-26 01:02:5769

    The circuit diagram of shanghai GM Buick commercial vehicle's(GL8) 2.5L motor data sensor, heating oxygen sensor Reprinted Url Of This Article: http://...

  • Simplified scheme of vibration sensor using a CA3094

    2014-11-25 23:32:32409

    The arrival of people who are not invited are not unpredictable and increasingly sophisticated skills as well. But the presence of these uninvited gues...

  • Inductive Speed Sensor For Cars(L64324C)

    2014-11-25 23:06:2997

    This article describes the Inductive Speed ??Sensor For Cars (L64324C). The principle is very simple, very practical. The circuit components can help y...

  • Three phase SCR trigger

    2014-11-25 22:24:0599

    XMA5000 series regulator sends out three phase SCR trigger pulse instruction, and it emits six SCR phase shift trigger or zero-crossing trigger control...

  • Relative Humidity Sensor

    2014-11-25 21:18:24138

    View Full Size Image View Original Datasheet This sensor is a capacitive element that changes value with humidity. By charging the sensor with a fixed ...

  • Fast Audio Peak Limiter

    2014-11-25 21:18:07142

    The circuit devised by Phil Allison still has some input voltage limitations, since it is based on a FET. Junction FET VCAs also create considerable di...

  • Cellular Phone Detector

    2014-11-25 19:39:05196

    This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of ...

  • Metal detector with 555

    2014-11-25 19:30:48180

    This circuit detects metal and also magnets. When a magnet is brought close to the 10mH choke, the output frequency changes. visit page....

  • Precision Dimming Light Control Circuit

    2014-11-25 17:23:2275

    Precision dimming light control circuit is as shown in the figure. Since the introduction of R5 has brought a small amount of positive feedback, with t...

  • Light Switch with 555 Timer

    2014-11-25 16:20:26143

    When the phototransistor is stroken by IR light it conducts and the voltage between the 1Mohm resistor(arbitrary) and the phototrans drops from VCC to ...

  • Easy Pulse: A DIY photoplethysmographic sensor for measuring

    2014-11-25 15:54:24182

    When I first built the Heart rate measurement through fingertip project, the infrared LED and photodiode used for finger photoplethysmography were actu...

  • Pulse Induction Metal Detector

    2014-11-25 15:34:40202

    This project is offered totally Free for those who are interested in it.I have tried to make this article as complete as possible, but I will Notassume...

  • Analog Compensation Circuit for PT100 RTD Temperature Sensor

    2014-11-25 15:00:24277

    There are some digital and analog that can be used for compensating a PT100 RTD nonlinearity. We can implemented the digital linearization by implement...

  • Dark-activated 230V Lamp

    2014-11-25 13:41:33170

    This device allows one or more lamps to illuminate at sunset and turn off at dawn.Q1 and Q2 form a trigger device for the SCR, providing short pulses a...

  • Sensitive electromagnetic field sensor.

    2014-11-25 13:38:14109

    Description. This is the circuit diagram of a very sensitive electromagnetic field sensor which can sense electromagnetic field from 40Hz to 140Hz. The...

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