Battery Health Checker Circuit

Dec 31, 2015

The article discusses a simple battery health checker circuit which uses ordinary components for enabling the user to get an instant reading of the battery efficiency or regarding its effective discharge rate. The idea was requested by Mr. Shrishail.

Designing Notch Filter Circuits

Dec 30, 2015

Notch filter circuits are normally used for suppressing, nullifying, or cancelling a particular range of frequencies in order to avoid an annoying or unwanted interference within a circuit configuration.

What's Internal Resistance of Battery

Dec 26, 2015


The internal resistance (IR) of a battery is basically the level of opposition to the passage of electrons or current through the battery in a closed loop.

LM317 with Outboard Current Boost Transistor Circuit

Dec 23, 2015

The popular LM317 voltage regulator IC is designed to deliver not more than 1.5 amps, however by adding an outboard current boost transistor to the circuit it becomes possible to upgrade the regulator circuit to handle much higher currents, and upto any desired levels.

Bathroom Lamp Timer with Buzzer Circuit

Dec 21, 2015

The simple bathroom lamp timer circuit features a delay OFF timer which switches OFF the triggered lamp after a set predetermined time delay, additionally the circuit also includes a delay ON timer circuit which is appropriately set such that a warning tone is generated a few seconds before the lamp is about to shut off. The idea was requested by Mr. Enrico.

40A Diode with Reverse and Overvoltage Protection

In this post we study an outstanding high current diode which features not only an in-built reverse current protection but also an overvoltage protection for safeguarding sensitive electronic circuits against back emfs, transients and load dump occurrences.

Battery Charger Circuit with 4 LED Indicator

Dec 20, 2015

A universal current controlled automatic battery charger circuit with 4 LED indicators can be learned in the following post. The design also includes a 4 level charging status indicator using LEDs. The circuit was requested by Mr. Dendy.

Laser Alarm Circuit for Protecting Field Crops against Animals

Dec 18, 2015

The post explains a simple laser alarm circuit which can be installed in farms and fields for detecting all possible intrusions, either by a human or an animal and alarming this to the owner, and ensuring an effective protection to the crops against such intrusions. The idea was required by Mr. Mohammed and Mr. Daniel.

Multilevel 5 Step Cascaded Sine Wave Inverter Circuit

Dec 17, 2015

In this article we learn how to make a multilevel (5 step) cascaded inverter circuit using a very simple concept developed by me. Let's learn more regarding the details.

220V Dual Alternate Lamp Flasher Circuit

Dec 15, 2015

This is a mains operated transformerless flasher circuit that can be used for alternately switching a couple of CFL or similar 220V/120V lamp to produce a decorative lighting effect.

Make this 3.3V, 5V, 9V SMPS Circuit

Dec 13, 2015

Here we learn about a simple switch mode power supply (SMPS) circuit which is capable of delivering 3.3V, 5V, 9V at around 800mA from a Mains input range of 100V to 285V, with a complete isolation.

Over Voltage Protection Circuit for Automotive Load Dump

Dec 12, 2015

Transient bus voltages are a significant risk factor to integrated circuits. The maximum breakdown voltage that an integrated circuit may be specified to tolerate is determined by its style and design approach that can be predominantly low for tiny CMOS devices.

Automatic Solar Light Circuit using a Relay Changeover

This automatic solar light circuit using relay changeover is designed for charging a battery during day time or as long as the solar panel is generating electricity, and for illuminating a connected LED while the panel is not active.

Inverter/Mains AC Changeover Circuit Using Triacs

Dec 11, 2015

The post explains how to make a simple triac based solid-state Inverter/mains AC changeover circuit, the idea was requetsd by Music girl.

Automatic CDI Spark Advance/Retard Circuit for Motorcycles

Dec 10, 2015

In this article we learn the method of upgrading the earlier posted advance, retard CDI circuit, to an automatic version using a tachometer and an opamp circuit stages. The idea was requested by Mr. Mike, and designed by Mr.Abu-Hafss.

Synchronous Switch-Mode MPPT Battery Charge Controller Circuit

Dec 9, 2015

The device bq24650 includes an advanced built-in MPPT Synchronous Switch-Mode Battery Charge Controller. It offers a high level of input voltage regulation, which prevents the charging current to the battery each time input voltage drops below a specified amount. Learn More:

60W, 100W, 150W, 250W Power Amplifier Circuit - Construction details

Dec 5, 2015

The post presents an in-depth discussion regarding the construction details of a universal high power amplifier which can be modified or adjusted to suit any range within 50 watt, 100 watt, 150 watt or even 250 watt power output (RMS).

DC CDI Circuit for Motorcycles

Dec 3, 2015

The circuit presented here is for a DC-CDI which are used in motorcycles. A DC-CDI is the one in which the high voltage (200-400VDC) is converted from 12V supply voltage.

How to Calculate Boost Converter Power Stage

Dec 2, 2015

The article provides us with all the equations for enabling easy calculation of the power stage of a boost converter circuit having an integrated IC based operating system and in the continuous mode.
 

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