These AC to DC power supplies use a single chip to convert mains 220 V or 120 V input AC into 12 V or 5 V DC without depending on […]
Transformerless Power Supply
Transformerless power supplies are those units which do not employ any kind of inductor based device for transforming a certain level of input power to another desired level.
These work mainly using a capacitor for the required stepping up or stepping down an input power to the required magnitudes.
Under this category we specifically deal with transformerless power supply circuits designed to step down the mains 220V AC or 120 AC to some lower levels such as 12V, or 6V etc.
Such circuits are also called capacitive power supply circuit since these use a high voltage capacitor for stepping down the mains input current to the lower acceptable limits.
therefore these circuits basically bring down the high input alternating current to lower levels, but the voltage level is not transformed.
And because of this a zener diode or a transistor based voltage stabilizer is normally employed for controlling the voltage level.
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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 […]
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 […]