This article describes the Board System Monitoring for Temperature and Voltage Condition (NE1617A). The content is very simple, very helpful. Component...
Circuit diagram Parts D1 LEDR1 1.2k ResistorR2 10k Var. ResistorU1 UA741 OP AMP Description When the input voltage is 0 the LED glows. The LED stops gl...
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...
This article describes a Single Transistor Lead Acid Battery Monitor (BC547). The principle is very simple, very practical. The circuit components can ...
This Circuit helps in the monitoring of mains supply voltage. It does not use a isolation step down transformer. This has to be constructed only by ski...
This relaxation and stress monitor circuit tells you that whether your body is relaxed or not. It exploits the skin’s galvanic property to measure th...
View Full Size Image View Original Datasheet The LTC2991 is used to monitor system temperatures, voltages and currents. Through the I2C serial interfac...
To monitor the pins of the chip without any load I put on two 74HC245 integrated that drive the LEDs. In this way I view the states of the inputs and o...
Here is a circuit that can sense the static electricity level in the atmosphere. It gives LED indications for both positive and negative atmosphere cha...
Parts: R1,R2,R8____________1K 1/4W Resistors R3,R4_____________220K 1/4W Resistors R5________________100R 1/4W Resistor (See Notes) R6_________________...
The circuit uses a Hall-effect sensor, which consists of an IC that resides in a small gap in a flux-collector toroid, to measure dc current from 1 to ...
Connect this circuit to a transceiver with a coaxial T connector in the transmission line. Key the transmitter (unmodulated), set 31 to CAL, and adjust...
One of features of the AD620 instrumentation amplifier is low current noise, this benefit allows its use in the Electrocardiography (ECG) monitors. A m...
This heatsink temperature monitor circuit signals via 3 LEDs when the temperature exceeds 2 boundary levels. When the heatsink temperature is below 50 ...
This is a over/under voltage monitor circuit. This circuit is used to monitor Any potential from 1 to 15 V. If there is a undesirable variation was occ...
If you looking for a feature-rich power monitoring device that suits on a wide variety automotive, telecom, and industrial applications you may conside...
This article describes the Three input first response monitor CIRCUIT (2N5062). The principle is very simple, very practical. The circuit components ca...
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 ...
View Full Size Image View Original Design Note The dual outputs of the LTC6103 can be used individually to provide overload detection, and/or may be ta...
A bridge rectifier and 12-volt regulator powers the MOSFET sensing circuit. The unregulated output of the bridge rectifier operates the drain solenoid ...
This article describes the ESP SIM Sound Impairment Monitor (MJE2955). The content is very simple, very helpful. Components in this article can help yo...
A low-cost filament transformer provides a linear indication of the load current in an ac line. This method causes a slight series voltage drop over a ...
View Full Size Image View Original Datasheet The LT1990 is a micropower precision difference amplifier with a very high common mode input voltage range...
This article briefly describes the Mains Voltage Monitor (BC337). Although this circuit is very easy to understand, but also very practical. Circuit el...
This circuit is a circuit diagram of security system. You can use this in the garden and listening to unusual sounds, or maybe just the sounds of wildl...
View Full Size Image View Original Datasheet The LT2940 measures a high side current and a differential voltage, multiplies them and outputs a current ...
This circuit uses a Hall-effect sensor, consisting of an IC that resides in a small gap in a flux-collector torrid, to measure de current in the range ...
Temperature Monitor Notes: Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the...
This circuit monitors the voltage of a battery and warns the operator when the battery voltage is below a preset level by tumingon an LED. The values a...
This article describes the Pulse Rate Monitor (TLC274). The principle is very simple, very practical. The circuit components can help you understand be...
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