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  • Infrared Heart Pulse Monitor

    2014-11-06 16:24:39121

    Senses heart pulse by means of an infrared earlobe clip. Reverse engineered circuit diagram of heart pulse sensor circuit board out of a treadmill. Not...

  • Multiple-frequency Signal Generator Circuit

    2014-11-06 15:48:1774

    As shown in the figure is a multi-frequency signal generator. SJT, VT1 constitute a crystal oscillator. Since quartz crystal SJT is used as an equivale...

  • MARK_SENSOR_FOR_CARDS

    2014-11-06 15:08:5671

    Automatically transcribes up to 40 pencil marks on specially printed 90-column cards into machine code and block-punches information into cards in any ...

  • Reed switch current sensor circuit diagram

    2014-11-06 13:42:5971

    As shown in the figure, it is a current sensor circuit, when the switch closes, if all the bukbs work normally, it has rated current in current coil, t...

  • Relative Humidity Sensor Digitizer-Charge Pump Based

    2014-11-06 13:08:1771

    View Full Size Image View Original Application Note Hygrometer Digitizer Has 0.3% Accuracy, Although Sensor Must Float Off-Ground. Humidity Sensor Dete...

  • Plant Watering guard with 4093

    2014-11-06 12:28:45114

    A flashing LED signals the necessity to water a plantVery low current consumption - 3V powered circuit. This circuit is intended to signal when a plant...

  • The closing door reminder circuit (1)

    2014-11-06 10:19:5272

    See as in Figure 13-1, the circuit consists of a trigger relay circuit and an integrated music circuit. When the fridge door is open, the touch switch ...

  • Solar Cell charges a NiCd AA cell when darkness falls

    2014-11-06 09:59:19145

    Reverse engineered circuit diagram of a popular mass produced solar light. The light automatically turns on when there is no light falling upon the sol...

  • Blood Pressure Sensor Circuit

    2014-11-06 09:39:38142

    As shown in the picture, this circuit uses BP01 type pressure sensor and operational amplifier MAX4472. The BP01 type pressure sensor is specially desi...

  • Digit Counter Circuit

    2014-11-06 07:42:2473

    As shown in figure,the original mechanical counterjust has two magnetic switch signals terminals, while electronic counter increases input terminal c,d...

  • Oxygen sensor and PCM connection circuit diagram

    2014-11-06 07:30:4078

    As shown in the figure, it is a oxygen sensor and PCM connection circuit. When the diagnosis instrument displays fault codes: DTCP0031、DTCP0032、DTC...

  • Homemade photo-couplers Circuit

    2014-11-06 06:21:5175

    Combine the Φ55mm, red LED with photoresistance by transparent tape and put them in a pigmented penholder(black for good),and then seal both end,which...

  • Magnetic proximity sensor is discussed

    2014-11-06 05:57:4879

    This article is a magnetic proximity sensor is discussed. By convention, in order to better grasp the principles you are, we recommend you to combine t...

  • High-Frequency-Generating Lamplighter Circuit

    2014-11-06 05:36:3574

    As shown in the figure is a high-frequency-generating lamplighter circuit. Supplied by battery of 8 V ~ 14 V, it will light 6 W ~ 12 W fluorescent lamp...

  • PHOTOELECTRIC_SENSOR

    2014-11-06 05:28:4982

    The circuit can be used as a sensor that can trigger an alarm without direct contact being madeby the intruder In this circuit,a visible or invisible...

  • Small Metal Detector II

    2014-11-06 05:07:49170

    A Simple design based on a CS209A IC that can give surprising results and draws very little current from a 9 volt battery. It worked good on the Bench,...

  • Light sensor alarm circuits (AC128)

    2014-11-06 00:04:06144

    This article describes the Light sensor alarm circuits (AC128). The content is very simple, very helpful. Components in this article can help you under...

  • The dual steady circuit of photoelectric couplers and transi

    2014-11-05 23:18:1070

    In the figure is dual steady circuit of photoelectric couplers and transistors. At the moment of power-on, the transistor VT is blocked, and the circui...

  • Strain gauge sensor (AMP04)

    2014-11-05 22:01:38193

    The diagram is a schematic diagram of strain gauge sensors. You know the strain gauge sensor schematic diagram, we give you about an important strain g...

  • Tilt Sensor Alarm Circuit

    2014-11-05 18:29:2088

    Ultra simple circuit of the tilt sensor alarm presented here can be fabricated using readily available inexpensive components. The circuit is a true tr...

  • Water Level Sensor Circuit

    2014-11-05 16:11:5781

    This simple water level sensor circuit monitors the presence of water in a certain location or container. The circuit sends an acoustic alarm when it s...

  • RELATIVE_HUMIDITY_SENSOR_SIGNAL_CONDITIONER

    2014-11-05 15:44:3269

    This circuit combines two LTC1043s with a based humidity transducer in a simple charge-pump based circuit. The sensor specified has a nominal 400 pF ca...

  • TEMPERATURE_TO_FREQUENCY_CONVERTER

    2014-11-05 14:24:4674

    A1's positive input is biased by the thermocouple. A1's output drives a crude V → F converter, comprised of the 74C04 inverters and associated compon...

  • High-Gain Current Sensor

    2014-11-05 13:23:1079

    A high-gain amplifier using a UA741 is used to sense relative voltage drop in a conductor, and therefore current i n the conductor. i2 can be increased...

  • Color Sensor circuit diagram

    2014-11-05 12:53:28108

    This is the color sensor circuit diagram. Color sensor is definitely an exciting project for hobbyists. The circuit can sense eight colors, i.e. blue, ...

  • Liquid detector, water sensor circuit

    2014-11-05 12:28:4880

    This is a very simpleliquid detectorthat use a relay to open an evacuation van. You can use it for water or any liquid that conduct electricity. Use an...

  • Phasemeter_for_sinusoidal_signals

    2014-11-05 12:04:5569

    Phasemeter for sinusoidal signals. This circuit provides a good linear measure of phase for small angles up to 14° and a sinusoidal measure of angles ...

  • Water Level Sensor and Alarm Circuit with CD4066

    2014-11-05 11:06:14625

    For circuit not only indicates the amount of water in the tank head, but also gives an alarm when the tank is full. This circuit uses the widely availa...

  • Full HD 1080p Video Sensor (AR0330)

    2014-11-05 11:05:4278

    This article describes a Full HD 1080p Video Sensor (AR0330). The principle is very simple, very practical. The circuit components can help you underst...

  • Photo detector using LED

    2014-11-05 09:33:28140

    Here's a circuit that takes advantage of the photo-voltaic voltage of an ordinary LED. The LED voltage is buffered by a junction FET transistor and the...

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