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Newly Updated Circuit Projects:

Transcranial Random Noise Stimulation (tRNS) Circuit

Last Updated on May 24, 2026 by Swagatam 8 Comments

TRNS transcranial random noise stimulator circuit

In this post I have explained a basic Transcranial random noise stimulation (tRNS) circuit diagram which can be implemented externally for stimulating brain cells, resulting in an enhanced performance of the brain. The design was requested by an avid reader of this blog “Ankita”, as given below. Design Request I’m interested in building a tRNS […]

Filed Under: Health related Projects Tagged With: Noise, Random, Stimulation, Transcranial, tRNS

Car Tank Water Sensor Circuit

Last Updated on May 22, 2026 by Swagatam 36 Comments

car2Btank

In this article I have explained a simple car tank water sensor alarm circuit using IC 555 and a pulsating signal on the sensing probes to pevent corrosion on the probes. The idea was requested by Mr. Peter. Circuit Objectives and Requirements The Design Referring to the figure below, the proposed car tank water sensor […]

Filed Under: Automobile Electronics, Water Controller Tagged With: Sensor, Tank, Water

Single Phase Preventor Circuit

Last Updated on May 21, 2026 by Swagatam 6 Comments

simplesinglephasingpreventercircuit

In this post I have explained a couple simple circuits which when installed will prevent single phase occurrence in a 3 phase system. Introduction We all know that for operating heavy electrical loads three phase power or AC is required in order to make the functioning efficient and viable. However this necessitates the presence of all the three phases […]

Filed Under: Grid and 3-Phase Tagged With: Phase, Preventor, Single

Single Phase Voltage from Three Phase Voltage Source

Last Updated on May 21, 2026 by Swagatam 52 Comments

single phase from three phase

In this post I have explained a simple relay changeover circuit for extracting single phase AC from a three phase AC source irrespective of the condition whether all the three phases are present or not. The circuit was requested by Mr. Biannz. Technical Specifications hi sir please i need something I’ve been searching everywhere but not avail […]

Filed Under: Grid and 3-Phase Tagged With: Phase, Single, Source, Three, Voltage

How to Make a 3 Phase VFD Circuit

Last Updated on May 21, 2026 by Swagatam 348 Comments

pwmvoltageregulator

The presented 3 phase VFD circuit (designed by me) can be used for controlling the speed of any three phase brushed AC motor or even a brushless AC motor. The idea was requested by Mr. Tom Using the VFD The proposed 3-phase VFD circuit can be universally applied for most 3-phase AC motors where the […]

Filed Under: Grid and 3-Phase, Motor Controller Tagged With: Phase, VFD

Solid-State Inverter/Mains AC Changeover Circuits Using Triacs

Last Updated on May 21, 2026 by Swagatam 24 Comments

inverter2Bmains2Bchangeover

In this post I have explained 2 simple concepts for making solid-state triac based Inverter/mains AC changeover circuit, the idea was requested by Music girl. Technical Specifications I would like to replace the SPDT relay with 2 scr’s. Would you consider a circuit to replace those changeover relays? I believe a relay would need to […]

Filed Under: Grid and 3-Phase Tagged With: AC, Changeover, Inverter, Mains, Solid, State

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