The post helps us to understand 3 inverter circuits designed to work without a transformer, and using a full bridge IC network and a SPWM generator circuit. The first idea as given below was requested by Mr. Ralph Wiechert Main Specifications Greetings from Saint Louis, Missouri. Would you be willing to collaborate on an inverter project? […]
Search Results for: transformerless
Transformerless AC Voltmeter Using Arduino
In this article we learn how to make a transformerless AC voltmeter using Arduino. Making an analog voltmeter is not an easy task as to build one you must have good knowledge of physical quantities like torque, speed; which can be very difficult when it comes to their practical applications. By Ankit Negi But a […]
Transformerless 0-400V Power Supply
A cool 0-400V variable transformerless power supply circuit can be built using just a single chip LR8, and a few resistors. The IC features a built in current control stage which makes the design extremely safe even for critical electronic circuits. How LR8 IC is Designed to Work The IC LR8 is quite similar to […]
Transformerless PWM Mains Voltage Stabilizer
The post discusses a simple circuit design which ensures a perfectly stabilized mains voltage across the connected load, without using relays or transformers, rather by the use of accurately dimensioned and self adjusting PWM pulses. The idea was requested by Mr. Mathew. Technical Specifications About power optimizer (stabilizer) I need a simple circuit board which […]
Transformerless Constant Current LED Driver
In this post we learn how just a single IC MBI6001 can be used as a transformerless constant current LED driver circuit for illuminating a chain of many LED in series. The MBI6001 series of ICs are designed to work with mains AC inputs and convert it into a lower voltage DC output which may […]
Zero Crossing Transformerless Power Supply
The post explains the importance of a zero crossing detection in capacitive transformerless power supplies in order to make it completely safe from the mains switch ON inrush surge currents. The idea was proposed by Mr. Francis. Technical Specifications I have been reading about the transformer less power supply articles on your site with great […]
Voltage Stabilized Transformerless Power Supply
The post explains how an ordinary capacitive power supply may be transformed into a surge free voltage stabilized or variable voltage transformerless power supply applicable for almost all standard electronic loads and circuits. The idea was requested by Mr. Chandan Maity. Technical Specifications If you remember, I communicated you sometime before with comments at your […]
Switching Transformerless Power Supply using IC 555
A simple yet smart solution is implemented here using IC 555 in its monostable mode to control in rush surge in a transfomerless power supply via a zero crossing switching circuit concept, wherein the input power from the mains is allowed to enter the circuit only during the zero crossings of the AC signal, thereby eliminating the […]
Stabilized Transformerless Power Supply Circuit with 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 […]
0-300V Adjustable Transformerless Power Supply
The post explains a simple 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 0 […]
Variable High Current Transformerless Power Supply
The following post discusses a simple transformerless power supply circuit whose output can be varied from zero to the maximum specified voltage level. The design also ensures the availability of relatively high currents, and protection against switch ON surge currents. (Designed by “Swagatam”). The Circuit Concept We have already seen quite a few transformerless power supply designs […]
Transformerless Power Supply Using MJE13005
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 […]
Surge Protected Cheap Transformerless Hi-Watt LED Driver
The increased number of complaints from the readers regarding burning LEDs associated with my earlier posted transformerless 1 watt LED driver circuit, compelled me to solve the issue once for all. The power supply section of the circuit discussed here remains exactly identical to the previous configuration, except the inclusion of the “switch ON delay […]
Making a Transformerless Solar Inverter
Sun is a major and an unlimited source of raw power which is available on our planet absolutely free. This power is fundamentally in the form of heat, however humans have discovered methods of exploiting the light also from this huge source for manufacturing electrical power. Overview Today electricity has become the life line of all cities and even the rural areas. With […]
High Current Transformerless Power Supply
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 […]
Making a 220v to 110V Transformerless Converter
The presented circuit has been taken from an old elektor electronic magazine which describes a neat little circuit for converting 220V mains input to 110V AC. Let’s learn more about the circuit details. Simulation and Working The shown circuit diagram of a transformerless 220v to 110v converter utilizes a triac and a thyristor arrangement for making the circuit successfully […]
Transformerless UPS for Computers (CPU)
In this post we discuss how to build a simple UPS circuit for backing up computers or PCs during sudden power failures or brownouts. Introduction Normally when we talk about uninterruptible power supplies (UPS) we imagine large inverter units with complex features, where it imperatively needs to be a pure sine wave type. Such inverters […]
Simple Transformerless Power Supply
A very compact simple transformerless power supply circuit is explained here using the concept of capacitive reactance for stepping down the input AC mains voltage. The Transformerless Power Supply Concept A transformerless power supply works by using a high voltage capacitor to drop the mains AC current to the required lower level which may be […]
How to Calculate Transformerless Power Supplies
This post explains how to calculate resistor and capacitor values in transformerless power supply circuits using simple formulas like ohms law. Analyzing a Capactive Power Supply Before we learn the formula for calculating and optimizing resistor and capacitor values in a transformerless power supply, it would be important to first summarize a standard transformerless power […]
What is Constant Current Source – Facts Explained
In this post we try to analyze what is constant current source and how it affects a load, or how it may be used with a load correctly for achieving the most efficient results. The following discussion between me and Mr. Girish will clearly explain what is CC or how constant current operates. How a […]