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Newly Updated Circuit Projects:

Camper, Motorhome Battery Charger Circuit

Last Updated on July 28, 2026 by Swagatam Leave a Comment

offshore 2

In this post I have explained 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”. Battery Charger for Motorhomes Based on this customized battery charger circuit I would […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Camper, Charger, Motorhome

Simple Soil Moisture Tester Circuit with a Single IC 741

Last Updated on January 4, 2024 by Swagatam 49 Comments

A very simple mud or soil moisture tester circuit can be built by using a single opamp and a few passive components, I have explained the details through the following article. Circuit Objective After water and sunlight the earth or the soil is the next most important natural gift that this planet has provided us […]

Filed Under: Sensors and Detectors Tagged With: 741, Moisture, Simple, Single, Soil, Tester

Opamp Hysteresis – Calculations and Design Considerations

Last Updated on September 12, 2026 by Swagatam 8 Comments

nohyst

In most automatic battery charger circuits in this blog you might have seen an opamp with a hysteresis feature included for some crucial function. In the following post I have explained the significance and design techniques for the hysteresis function in opamp circuits. To learn exactly what’s a hysteresis you can refer to this article […]

Filed Under: Electronics Theory Tagged With: Calculations, Considerations, Design, Hysteresis, Opamp

Single Phase Jet Pump Controller Circuit

Last Updated on March 13, 2019 by Swagatam 11 Comments

pump 2

In this post I have explained 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  Technical Specifications I am your blog follower,, i searched all the blogs for automatic submersible pump controller but i can’t understand which […]

Filed Under: Water Controller Tagged With: Controller, Phase, Pump, Single

Mini Welding Machine Circuit for Small Welding Jobs

Last Updated on January 1, 2024 by Swagatam 62 Comments

welding

A welding machine is an electrical device which is able to generate a very high current at relatively low DC voltages. This high current output can be suitably used for creating the intended welding arcs and welding joints. The welding joint is created by fusing the welding rod on the joint area through a high […]

Filed Under: Inverter Circuits Tagged With: Jobs, Machine, Mini, Small, Welding

Make this Crystal Radio Set Circuit using No Batteries

Last Updated on May 15, 2026 by Swagatam 14 Comments

crystal

A crystal radio circuit is probably the simplest form of radio that uses hardly any electronic components, and needs absolutely no external power for the operations. Crystal Radio Concept The only downside of this radio concept is the requirement of a very long antenna and a deep earthing, therefore this unit is not something which […]

Filed Under: Audio and Amplifier Projects Tagged With: Batteries, Crystal, Radio

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