Circuit diagram Notes: Using a single cable such as speaker wire or doorbell cable, this circuit can be remotely positioned, for example, at the bottom...
Description A Simple Splitter Driving Two (or even more) PC Monitors Notes The signal sources in the analog output stage of the PC SVGA card see the ri...
Part 1 - Schematic Firmware The entire firmware relies on logical decisions at every step. I wrote the code in a way that the complete code is divided ...
The Security Guard duty monitor below, shown in eight circuits at Digital Circuits 1 are examples of logic circuits, i have converted them from the DOS...
Using a dual-colour LED and few surrounding components, we can make a very simple battery monitor. This battery monitor circuit is suitable for? monito...
When your Monitronics alarm is activated and then triggered by an event like a burglary or fire, Monitronics immediately goes into action. Your home se...
By detecting a voltage drop in resistor connected in series with the battery, we can measure the current flowing in or out of the battery. A simple dif...
Monitoring a flame and directly switching a 120-V load is easily accomplished using the Ll4G1 for point sources of light. For light sources which subte...
A simple bridge rectifier and a 12-V regUlator powers the MOSFET sensing circuit. The unregUlated output of the bridge rectifier operates the drain sol...
This is a supply voltage monitor circuit, an indicator to show if the power supply is in good condition. Designed using the IC 555 timer, this circuit ...
? simple heart-beat transducer can be made from an infrared LED and an infrared phototransistor. ?t works because skin acts as a ref1ecti?e surface for...
This circuit shows a typical over/under-voltage fault monitor for a single supply. The upper trip points, controlling OUT 1, are centered on 5.5 V with...
This article describes the Monitor Pin Detector (74HC245). The content is very simple, very helpful. Components in this article can help you understand...
An IR photodiode, which senses IR skin reflectivity as a result of increased blood volume during the periods that the heart forcibly contracts, is used...
View Full Size Image View Original Datasheet The common mode inputs to the LT1999 switch between Vs and one diode drop below ground.The LT1999 is a hig...
This article describes the PC Heat Monitor (LL4148). The principle is very simple, very practical. The circuit components can help you understand bette...
This article describes Supply Voltage Monitor (BC558). The principle is very simple, very practical. The circuit components can help you understand bet...
View Full Size Image View Original Design Note High input impedance of LT1991 P3 and M3 inputs, ( 150K ), is used to eliminate errors introduced by the...
This article is about an enlarged ear monitoring circuit brief. Before you look at the diagram, I will first introduce you to one of the circuits two c...
View Full Size Image View Original LT Journal The LTC4261 negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a ...
This article describes the Darkness monitor CIRCUIT (2N5061). The content is very simple, very helpful. Components in this article can help you underst...
This circuit is designed to monitor the atmospheric charge. By observing the increase in the atmospheric charge, it is possible to predict a nearby lig...
The circuit of battery monitor below uses 3 separate LEDs. Voltage level between 6v to below 11v will turn the red LED on and will turn off above 11v. ...
The PC processor generates very high temperature during its operation which is dissipated by the large heat sink placed above the processor. If the hea...
View Full Size Image View Original Datasheet The HV version of the LTC6101 can operate with a total supply voltage of 105V. Current flow in high supply...
This circuit is Current Monitor. R1 senses current flow of a power supply. The JFET is used as a buffer because lD= lS, therefore the output monitor vo...
Description. Here is a simple circuit that will give a visual indication when the soil water level inside your flower pot goes low below a certain limi...
This project is a micro controller chess game. The objective has to be able to play chess on a VGA monitor, including an intelligent computer to play a...
The Sensus Voltage Monitors (TVM1 and TVM3) gauge line voltage and provide real-time notifications of steady state values, outages and under or over vo...
Light filtering through the finger tip is detected by the cadmium sulphide photoresistor CD1 which forms the feedback network for transducer amplifier ...
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