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  • Breath-monitor

    2015-01-22 19:24:35316

    The mercury-in-rubber strain gauge is the detector of breathing. In the model device, the strain gauge produced by Medimatic, Demark was used. The chan...

  • Fuse Monitor Indicator

    2015-01-22 19:15:4774

    Description: The idea for this project may have come to me in a flash of inspiration, and its a very simple way to check if a fuse has blown without re...

  • Two Transistors Lead Acid Battery Monitor (BC557)

    2015-01-22 18:56:59273

    This article describes the Two Transistors Lead Acid Battery Monitor (BC557). The principle is very simple, very practical. The circuit components can ...

  • Automotive battery monitor circuit

    2015-01-22 18:53:23125

    When the vehicles battery voltage is below 10K pot (preset value), the car battery monitoring circuit causes warning lights (LED) lights. Warning light...

  • Battery Level Monitor circuit

    2015-01-22 18:13:57383

    This simple circuit can monitor the charging process in 12 Volt Lead Acid battery or Tubular battery. The status of LED indicates whether the battery i...

  • S/PDIF monitor

    2015-01-22 17:26:57212

    The S/PDIF monitor is one of the many applications possible with the digital audio interface receiver Type CS8412 from Crystal. Other applications desc...

  • Temperature Monitoring with an NTC Thermistor While Measurin

    2015-01-22 15:52:1077

    View Full Size Image View Original Datasheet The LTC4151 is a high side power monitor that operates over a wide voltage range of 7V to 80V. In default ...

  • Monitoring Off-Air Condition (1N67A)

    2015-01-22 15:25:4669

    This article describes the Monitoring Off-Air Condition (1N67A). The content is very simple, very helpful. Components in this article can help you unde...

  • Monitor and Look Out Circuit for Infant/Baby

    2015-01-22 13:36:3178

    Figure 1 The circuit was designed for the sole purpose of making a way to watch over a baby while he is left alone in his room. TL072 – a low noise J...

  • Supply Voltage Monitor

    2015-01-22 12:55:5278

    A circuit for monitoring supply voltages of 5 V and 12 V is readily constructed as shown in the diagram. It is appreciably simpler than the usual monit...

  • Fuse monitor circuit

    2015-01-22 12:20:3078

    This circuit monitors a DC fuse. Its LED lights continously when the fuse is intact but blinks is the fuse is broken. The fuse monitor circuit is desig...

  • Wireless temperature monitor has data-logging capabilities

    2015-01-22 11:50:1795

    Tom Au-Yeung and Wilson Tang, Maxim Integrated Products EDN You can make a wireless temps system with two ICs You can use a local temperature sensor an...

  • Pulse Rate Monitor

    2015-01-22 10:37:4691

    This simple circuit enables you to listen to your heartbeat, for instance, while you are exercising. The transducer used for detecting the pulse is an ...

  • 120W Supply Monitor Includes ICC of LT2940

    2015-01-22 09:46:3488

    View Full Size Image View Original Datasheet The LT2940 measures a high side current and a differential voltage, multiplies them and outputs a current ...

  • How to build Telephone line monitor

    2015-01-22 09:02:1391

    Telephone Recorder This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape r...

  • Current Monitor

    2015-01-22 07:44:0691

    On the circuit diagram, R1 is used to senses current flow of a power supply. We could use JFET as a buffer because Id=Is, therefore the power supply cu...

  • Voltage Monitor electronic circuit diagram

    2015-01-22 07:28:2872

    Parts List D1 LED R1 1.2k Resistor R2 10k Var. Resistor U1 UA741 OP AMP Description When the input voltage is 0 the LED glows. The LED stops glowing wh...

  • Failure Switch Monitor for Car Lamps/Bulbs

    2015-01-22 07:28:0374

    Figure 1 The circuit has been designed for use on cars and other types of vehicles that would provide an indication during a failure of the lamps or bu...

  • Monitoring Circuit for Telephone Line Usage

    2015-01-22 06:52:4271

    Figure 1 The circuit was designed to provide a monitoring scheme for a telephone line where several phones are installed, to indicate when one is being...

  • Motorcycle Battery Monitor(78L05)

    2015-01-22 04:57:4180

    This article briefly describes Motorcycle Battery Monitor (78L05). This principle is easy to understand, but also very practical. Depth understanding o...

  • Temperature Measurement (Sensing) and Monitoring

    2015-01-22 03:11:3868

    Temperature? measurement (sensing) and monitoring will be economical and straightforward if we apply the input of? TC9400 V/F converter with a voltage ...

  • Over/Under Voltage Monitor CIRCUIT (TDA7560H)

    2015-01-22 03:04:11122

    This article describes the Over / Under Voltage Monitor CIRCUIT (TDA7560H). The principle is very simple, very practical. The circuit components can he...

  • OP90 Single-Supply Current Monitor

    2015-01-22 02:59:2979

    This is Single-Supply Current Monitor circuit. Amplifying the voltage drop across a resistor placed in a series with the current to be measured is the ...

  • Loudspeaker Protector Monitors Current(LM339)

    2015-01-22 01:48:35135

    This article describes the Loudspeaker Protector Monitors Current (LM339). The principle is very simple, very practical. The circuit components can hel...

  • Plant Watering Monitor circuit

    2015-01-22 01:20:2069

    This plant watering monitor circuit is intended to signal when a plant needs water. A LED flashes at a low rate when the ground in the flower-pot is to...

  • INA159 Dual-Polarity, Bidirectional Current-Shunt-Monitor Ci

    2015-01-22 01:07:3181

    This article describes the INA159 Dual-Polarity, Bidirectional Current-Shunt-Monitor Circuit (OPA340). The content is very simple, very helpful. Compon...

  • Solenoid Current Monitoring

    2015-01-22 00:55:4579

    View Full Size Image View Original Design Note The large input common mode range of the LT6105 makes it suitable for monitoring currents in quarter, ha...

  • High Side Current Sense and Fuse Monitor

    2015-01-22 00:46:06436

    View Full Size Image View Original Design Note The LT6100 can be used as a combination current sensor and fuse monitor. This part includes on-chip outp...

  • Battery voltage monitor CIRCUIT (UA741)

    2015-01-22 00:36:28234

    This article describes the Battery voltage monitor CIRCUIT (UA741). The principle is very simple, very practical. The circuit components can help you u...

  • Fuse Monitor / Alarm

    2015-01-22 00:28:0094

    It came to me in a flash. A simple way to see if a fuse has blown without removing it from its holder. Its not often you can design a circuit using jus...

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