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Newly Updated Circuit Projects:

Adjustable 0-100V 50 Amp SMPS Circuit

Last Updated on February 12, 2025 by Swagatam 153 Comments

adjustable smps circuit

The high power adjustable switching power supply is perfect for the purpose of laboratory work. The topology used to design the system is switching topology – half controlled bridge. Written and Submitted by: Dhrubajyoti Biswas Warning: The following circuit design works with a direct 220 V Mains AC without any isolation at the input side, […]

Filed Under: Power Supply Circuits Tagged With: 100V, Adjustable, SMPS

Simple Water Heater Alarm Circuit

Last Updated on January 2, 2024 by Swagatam 1 Comment

buzzer with timer circuit

In this post I have explained a simple water heater alarm circuit which may be used as a safety device for getting indications regarding the switched position of a water heater or a geyser through intermittent buzzer actuation. The idea was requested by Mr. Mathew. Technical Specifications To be frank i am new to your […]

Filed Under: Security and Alarm Tagged With: Alarm, Heater, Simple, Water

SMPS Halogen Lamp Transformer Circuit

Last Updated on January 8, 2024 by Swagatam 24 Comments

halogen lamp circuit

One of the best substitutes for traditional light transformer for halogen bulbs is the electronic halogen transformer. It can also be used with non-halogen bulbs and any other form of resistive loads that does not run on RF current. Written and Submitted By: Dhrubajyoti Biswas Halogen Lamp Working Principle The electronic halogen lamp transformer works […]

Filed Under: Power Supply Circuits Tagged With: Halogen, Lamp, SMPS, Transformer

SMPS Welding Inverter Circuit

Last Updated on July 5, 2025 by Swagatam 144 Comments

welding2Bpower2Bsupply

If you are looking for an option to replace conventional welding transformer, the welding inverter is the best choice. Welding inverter is handy and runs on DC current. The current control is maintained through potentiometer. By: Dhrubajyoti Biswas Using Two Switch Topology When developing a welding inverter, I applied forward inverter with two switches topology. […]

Filed Under: SMPS and Converters Tagged With: Inverter, SMPS, Welding

Variable LED Intensity Controller Circuit

Last Updated on June 1, 2026 by Swagatam 16 Comments

led intensity controller circuit

The post presents a couple of simple LED intensity controller circuit which may be appropriately configured for specific related applications. The idea was requested by Mr. Chand. Technical Specifications I would like to have a circuit designed by you which is very simple and straightforward. This will be incorporated as a stand alone feature in […]

Filed Under: Lamps and Lights Tagged With: Controller, Intensity, LED, Variable

Alarm Signal Generator IC ZSD100 Datasheet, Application

Last Updated on May 18, 2026 by Swagatam 10 Comments

speaker alarm circuit

The ZSD100 is an alarm frequency generator IC which incorporates a frequency swept alarm signal generator designed solely for fixed and vehicle protection alarm systems. Circuit Operation For acquiring the specified alarm sound from this IC, just a single ZSD100, two timing capacitors, an in-expensive TO92 darlington, piezo transducer and coupling transformer is everything that […]

Filed Under: Datasheets and Components Tagged With: Alarm, Application, Datasheet, Generator, Signal, ZSD100

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