Sunday

Surge Protected Cheap Transformerless Hi-Watt LED Driver Circuit

The increased number of complaints from the readers regarding burning LEDs associated with my earlier posted transformerless 1 watt LED driver circuit, compelled me to solve the issue once for all. The power supply section of the circuit discussed here remains exactly identical to the previous configuration, except the inclusion of the "switch ON delay feature" which has been exclusively designed by me and added in the circuit for rectifying the burning LED problem (hopefully).

Friday

Make a Remote Controlled Toy Car Circuit

The market may be full of these hi-end remote controlled toy cars, but for a hobbyists making one at home can be entirely a different experience. The article below explains how to configure a simple remote controlled toy car using a ready made 4-relay remote control module.

Thursday

Adding a Soft Start to Water Pump Motors - Reducing Relay Burning Problems

When heavy motor systems or high current motors are involved, initial switch ON current surge often becomes an issue. This surge tends to inflict huge sparking across the pump relay contacts causing corrosion and reduction in its life due to stress, and wear and tear.

Wednesday

Tuesday

Comparing MOSFETs with BJTransistors - Pros and Cons

When we talk of electronics, one name becomes extremely related or rather common with this subject and that is the transistors, more precisely the BJT. Electronics is in fact based on these outstanding and indispensable member, without which electronics might virtually cease to exist. However with advancements in technology, mosfets have emerged as the new cousins of the BJTs and have of late taken the center stage.

Monday

PIR LED Lamp Circuit

The following circuit was designed by me for one of the followers of this blog Mr.Deepak upon his request. 
The circuit is a LED driver which responds to ambient light as well as to the presence of a human, person or intruder, and varies its illumination accordingly, let's know more.

Sunday

Mini 50 Watt MOSFET Inverter Circuit

I have already discussed one 50 watt inverter circuit in one of my earlier posts, the only difference between the previous and the present design is in the output stage. The previous circuit involved power transistors where as here we have utilized mosfets making the configuration much easier and straightforward.

Wednesday

Making a 200 watt Compact PWM Inverter Circuit - Using Tiny Ferrite Transformer

This circuit was requested by a few of the dedicated followers of this blog, namely Mr. Rashid, Mr, Sandeep and also by a few more readers. Initially I could not figure out the concept behind these compact inverters which completely eliminated the bulky iron core transformers. However after some thinking it seems I have succeeded in discovering the very simple principle associated with the functioning of such inverters.

Monday

Make a Battery Charger Circuit in 15 Minutes

I have posted many battery charger circuits in this site, some are easy to build but less efficient, while some are too sophisticated involving complex construction steps. The one posted here is possibly the easiset with its concept and also is extremely easy to build. In fact if you had all the required material you would build it within 15 minutes of time.

Thursday

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Tuesday

Automatic Inverter and Mains AC Changeover Circuit

I have been put forth with this question many times in this blog, how do we add a change over selector switch for automatic toggling of an inverter when AC mains is present and vice versa and also the system must enable automatic switching of the battery charger such that when AC mains is present the inverter battery gets charged and when AC mains fails, the battery gets connected with the inverter for supplying AC to the load. The configuration should be such that everything takes place automatically and the appliances are never switched OFF, just reverted from inverter AC to Mains AC and vice versa during mains power failures and restorations.

Monday

Simplest Power Inverter Circuit Using a Single 555 IC

The idea persented in this article can be considered as the simplest mosfet based inverter circuit which is not only simpe and cheap to build but is also significantly powerful. The power of the inverter may be increased to any reasonable limits y suitably modifying the number of mosfets at the output stage.

How to Generate Pure Oxygen and Hydrogen at Home

We all know the potentials of these two gases and how important they are on this planet. Oxygen is the life sustaining gas without which no living creature on this planet can live, hydrogen on other hand has its own merits and can be considered as the future fuel which would ultimately power our vehicles and cook our foods once all the naturally available fossil resources goes out of stock and gets depleted.

Sunday