In this post I have explained an upgraded version of my previous mains 220V/120V high-low voltage cut off protection circuit which now includes a delayed restoration of power for the load with 3 LED power status indicators. The idea was requested by one of the dedicated members of this website. Circuit Objectives and Requirements Main […]
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Heart Rate Monitor Circuit
In this article I will comprehensively discuss a relatively accurate electronic heart rate sensor circuit processed by a few discretely wired opamp circuit stages, and subsequently we’ll learn how this can be modified for making a heart rate monitor alarm circuit. Using IR Photodiode Sensors The sensing of the heart pulses is basically done by […]
Grid Load Power Monitor Circuit for GTI
In this post I have explained a circuit idea which can be used as a power monitor and control system for ensuring that only the specified amount of watts is allowed to enter into the allocated socket, as per the maximum calculated wattage of the appliances connected across those points. The idea was requested by […]
Ni-Cd Low Battery Monitor Circuit using Lambda Diode
The main feature of this lambda-diode low battery indicator for Ni-Cd batteries is that, the circuit itself consumes almost zero current, until the set low threshold level is reached and the indicator LED is illuminated. This feature makes the circuit very suitable for many low voltage battery operated systems, like radios, watches, timers, alarms, remote […]
Automotive Sensor Monitor Circuit Diagram
This fascinating Automotive Sensor Monitor Circuit was created and shared with me for publication by a devoted reader of this blog and passionate electronics enthusiast, Mr. August Peterson. I sincerely appreciate Mr. August’s valuable and generous contribution to this site. Overview Automotive diagnostic code readers are invaluable in displaying what the vehicle electronic control unit […]
Battery Voltage Monitor Circuits using LM324 and LM3915 ICs
The post describes simple battery charge monitor circuits or battery status indicator circuits using 4 LEDs to 10 LEDs, and using ICs like LM324 and LM3915. The first design is a 4 LED voltage monitor circuit using the versatile IC LM324. The idea was requested by Ms. Piyali. Technical Specifications I’ve a project, if you […]