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Newly Updated Circuit Projects:

Build this 85V–265V AC to 12V 5A SMPS Design Using UC3843 (With Calculations)

Last Updated on April 15, 2026 by Swagatam Leave a Comment

This thing is a full SMPS design using UC3843, which takes wide AC input from 85V AC to 265V AC, then gives out 12V DC at 5A, so now it is like a universal input supply, which can be used for 110V AC supplies and also for 220V AC input supplies… Input Protection Stage At […]

Filed Under: SMPS and Converters Tagged With: 12V, 265V, 85V, AC, Build, SMPS

Make this Simple Set Reset Circuit using IC 555

Last Updated on April 15, 2026 by Swagatam 42 Comments

In this post I have explained a simple IC 555 set/reset application circuit for activating or deactivating a relay alternately. Audio/Video Representation Circuit Operation This electronic set reset circuit is very simple, easy to implement and very useful. It can provide you many applications options in cases where it may be necessary to toggle (switch […]

Filed Under: Mini Projects Tagged With: 555, Reset, Simple

Make this Single MOSFET Solid-State Relay SSR circuit

Last Updated on April 15, 2026 by Swagatam 2 Comments

This single MOSFET solid-state relay SSR circuit is a very simple where you can drive an AC load like a lamp, motor, or any oter AC load, through a small DC control voltage. We use only one IRF840 MOSFET to switch the 220V AC load, and we do this with some clever diode bridge arrangement, […]

Filed Under: Voltage Control and Protection Tagged With: MOSFET, Relay, Single, Solid, SSR, State

Passive Power Factor Correction (PFC) Calculator

Last Updated on April 15, 2026 by Swagatam Leave a Comment

This passive PFC calculator does not use any MOSFET or PWM or switching frequency. It only uses 50 Hz mains and it only works with inductors and capacitors, so the only thing that matters is the reactance of the inductor and the reactance of the capacitor at the mains frequency. That is why the calculator […]

Filed Under: Voltage Control and Protection Tagged With: Calculator, Correction, Factor, PFC, Power

XL6009 DC-DC Converter IC: Pinout, Working, Circuit Diagram, and Applications

Last Updated on April 15, 2026 by Swagatam Leave a Comment

XL6009 is a DC-DC switching regulator IC, and we use it where lower voltage DC has to be lifted higher, or sometimes changed other ways, boost, buck-boost, flyback, even inverting, all that is possible depending how outside parts are connected. Why XL6009 is More Efficient Than Linear Regulators It is not like old regulator types […]

Filed Under: SMPS and Converters Tagged With: Applications, Converter, DC, Pinout, Working, XL6009

Long Duration Timer Circuit using IC 4541: Working and Calculations

Last Updated on April 15, 2026 by Swagatam Leave a Comment

The CD4541B is a CMOS programmable timer IC, and we use it where long delay interval is needed for a load, and also for jobs like frequency division, or timing pulse work. And all this happens with only just a few outside parts, not much around it. With ordinary IC 555, when delay becomes too […]

Filed Under: Timer and Delay Relay Tagged With: 4541, Calculations, Duration, Long, Timer, Working

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