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3 Solid-State IC Based 220V Adjustable Power Supply Circuits

Three simple yet efficient 220V IC based solid state transformerless adjustable solid-state power supply circuits are discussed here. The first one works using a single IC SR087. The design does not depend on high value capacitors or inductors and yet is capable of delivering 100mA current to the attache load. 1) Main Features and Board … Read more3 Solid-State IC Based 220V Adjustable Power Supply Circuits

1.5V Power Supply Circuit for Wall Clock

The post presents a simple transformerless 1.5V DC power supply circuit which can be used for powering wall clocks directly from mains, and also keep a stand by back-up cell fully charged for enabling an uninterrupted operation of the clock even during mains failures. The idea was requested by Cheekin Warning: This circuit is not … Read more1.5V Power Supply Circuit for Wall Clock

Transformerless Relay Driver Stage

In this post we discuss an enhanced transformerles power supply circuit design which consists a well stabilized and regulated DC stage along with a relay driver stage which operates through an external pulse. he idea was suggested by Mr. Reza. Technical Specifications Reza: Dear Sir, I have a problem with one Circuit regarding converting an … Read moreTransformerless Relay Driver Stage

0-300V Adjustable MOSFET Transformerless Power Supply Circuit

The post explains a simple mosfet controlled transformerless zero to 300 volts variable voltage and current power supply circuit which can be used for many different applications.To protect against my higher voltage research projects from shooting up in smoke permanently, I developed an easy circuit which is able to render a variable voltage supply of … Read more0-300V Adjustable MOSFET Transformerless Power Supply Circuit

MJE13005 Compact 220V Power Supply Circuit

The following article presents a very simple low current mains operated transformerless power circuit using an inexpensive MJE13005 transistor and few other passive electronic components. As can be witnessed in the given circuit diagram, the design is extremely straightforward. How it Works Transistor T1, which is a high voltage NPN transistor MJE13005 forms the main active component … Read moreMJE13005 Compact 220V Power Supply Circuit

High Current Transformerless Power Supply Circuit

The simple configuration of a transformerless power supply circuit presented below is able to provide high current at any assigned fixed voltage level. The idea seems to have solved the problem of deriving high current from capacitive power supplies which earlier seemed a difficult proposition. I assume I am the first person to have invented … Read moreHigh Current Transformerless Power Supply Circuit

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