Solar Charger Circuit using Transistors with Automatic Cut-off

May 31, 2016

The post details a simple solar charger circuit with automatic cut-off using transistors only. The idea was requested by Mr. Mubarak Idris.

Electronic Switch Circuit for Lights and Fan

The post explains an electronic switch circuit which can be implemented for controlling lights and fan with a customized sequential pattern. The idea was requested by Mr. Dheeraj.

Force Sensing Resistor Explained

May 30, 2016

In this article we are going to see, what force sensing resistor is, their construction, specification and finally how to interface it with Arduino microcontroller.

Testing Alternator Current using Dummy Load

The post explains a method of checking or verifying alternator maximum current delivering capacity using a shunt regulator as the dummy load and an ammeter. The idea was inquired by Mr. Joe.

Autoclave Heater Controller Circuit with Timer

May 28, 2016

In this article we learn how to make simple, accurate autoclave heater controller circuit with timer. The idea was requested by Mr. Rajjab.

H-Bridge Mains Voltage Stabilizer Circuit, 100V to 220V

May 27, 2016

The post explains how to make a high power 100V to 220V H-bridge mains voltage stabilizer circuit using automatic PWM control. The idea was requested by Mr. Sajjad.

Opamp Low High Battery Charger Controller Circuit

May 26, 2016

The post discusses a two opamp low high battery charger controller circuit which is not only accurate with its features but also allows a hassle free and quick setting up of its high/low cut-off threshold limits. The idea was requested by Mr. Mamdouh.

Simple Peak Detector Circuit

May 24, 2016

In this article we are going to learn about a peak detector circuit, its working principle and how to implement it in clap operated circuits for illuminating an LED in response to clap sounds.

Small Induction Heater Circuit for School Project

May 23, 2016

The post discusses a small induction heater circuit for school project and exhibitions, using a very ordinary IC 555 astable PWM circuit. The idea was requested by Mr. Anthony

How to Build a Microphone Amplifier Circuit

May 22, 2016

In this article we are going to see how to build a microphone amplifier circuit with operational amplifier LM324. This circuit can be used as good pre-amplifier for audio projects.

Cordless Drill Battery Charger Circuit

May 21, 2016

In this post we learn how to build and use a battery charger circuit for a cordless drill machine. The idea was requested by Mr. Chibuzo.

Home Security Circuit Using Arduino

May 20, 2016

In this article we are going to see how to build a home security system circuit using arduino which might save your home from intruders one day.

How to Set IC741 Battery Charger Circuit for Auto Cut-oFF

May 18, 2016

The post explains how to set or adjust an opamp 741 IC based battery charger circuit for implementing an automatic cut-off for the connected battery once it reaches the full-charge level.

Make this Radio Repeater Circuit at Home

The post discusses a simple radio repeater circuit which can be built by any new hobbyist or a radio amateur for communicating over long distances using ordinary transmitters and radio receivers.

Knock Activated Door Security Intercom Circuit

The post explains a simple knock activated door security alarm circuit which can be installed by anybody for identifying a guest or an intruder at the door. The idea was requested by Mr. Akhilesh.

Simple LED Relay Changeover Emergency Lamp Circuit

May 14, 2016

The post shows how to configure a simple LED relay changeover emergency light circuit using a battery back up which gets charged during mains presence and changes over to LED/battery mode as soon as mains fails. The idea was requested by one of the members of this blog.

Generator/UPS/Battery Relay Changeover Circuit

The article explains a generator/UPS/Battery relay changeover circuit for implementing a customized optimization for a generator, UPS, battery power network, in order to enhance the operational efficiency of the system. The idea was requested by Mr. Sidingilizwe.

220V Lithium-Ion Battery Bank Charger Circuit

May 13, 2016

The post narrates a 220V Li-ion Battery Bank charger circuit with an automatic over charge cut-off feature for operating with an electric car. The idea was requested by Mr. George.

Full Charge Voltage for Lead-Acid Battery and Hysteresis

May 12, 2016

The discussion tells us regarding what's full charge voltage for lead acid batteries and hysteresis significance in battery charging systems. The questions were asked by Mr. Girish Radhakrishnan.

How to Select MOV

May 9, 2016

MOVs or metal oxide varistors are devices designed for controlling mains switch ON surges in electrical and electronic circuits. Selecting an MOV for a particular electronic circuit might require some consideration and calculation, let's learn the procedures here.

Camper, Motorhome Battery Charger Circuit

May 8, 2016

The post explains a battery charger circuit specifically designed for camper and motorhome applications, so it can serve as an effective camper/motorhome battery charger circuit operating through any shore power supply source. The idea was suggested by "music girl".

Soil Moisture Tester Circuit

May 6, 2016

A very simple mud or soil moisture tester circuit can be built by using a single opamp and a few passive components, let's learn the details through the following article.

Opamp Hysteresis Explained

In most automatic battery charger circuits in this blog you might have seen an opamp with a hysteresis feature included for some crucial function. The following article explains the significance and design techniques for the hysteresis function in opamp circuits. 

BJT Common Collector, Emitter Follower Circuit

May 4, 2016

The common collector is a well known transistor (BJT) configuration among the other three basic ones, and is used whenever a transistor is required to be in the buffer mode, or as a voltage buffer.

Single Phase Jet Pump Controller Circuit

May 3, 2016

The post explains a simple single phase jet water pump controller circuit using magnetic reed switch level sensor, and a set/reset circuit. The idea was requested by Mr. Nanigopal mahata

Mini Welding Machine Circuit

May 2, 2016

A small transformerless welding machine circuit can be built using a few high voltage, high value capacitors and a rectifier diode, the following article explains more on it. The idea was requested by Mr. Tun.

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