The revised and simplified design can be viewed in the following diagram: The above designs were assessed and simplified with more effective results by Mr. The above design was inspired from the following circuit which was designed and presented in the elektor electronics magazine by the elektor engineers: Simplified Variable Power Supply Design using 2N3055 and 2N2222 Transistors Original Transistor Power Supply Diagram: If you have any doubts regarding this variable voltage and current power supply circuit using transistor 2N3055 circuit please do not hesitate to ask then through the comments below. P1 is set to choose the maximum range within the value that’s marked or identified by the resistor R4. The value of R4 is specifically becomes responsible for defining the maximum allowable output current. Therefore in this variable power supply circuit using 2N3055 transistor, the transformer being a 0 – 40 V, the output becomes variable right from 0.6 to 40 volts maximum, that’s very handy indeed.įor implementing the current control feature, T3 along with P1, R5 and R4 are involved. If any other specific minimum value is required then the diode can be replaced by zener diode having the required specified value. The inclusion of D1 makes it sure that the voltage can be lowered right down to 0.6 volts, which happens to be the forward voltage drop of the diode. Circuit Diagram How it WorksĪ keen look at this 2N3055 based variable voltage current power supply circuit using transistor 2N3055 reveals that it’s actually only an ordinary stabilized power supply circuit, however it yet still provides you with the proposed features very efficiently.The voltage variations are made by using the preset P2, through a feedback configuration employing the components D1, R7, T2 and P2. 1) Adjustable from 0-30V, 0-60V, and 0-100V, and 500mA to 10 Amp as per user preferenceĢ) Short Circuit Protected when mounted on proper heatsinkĪ power supply circuit that does not include the features of a variable voltage and current control can by no means be considered truly versatile.Ī variable workbench power supply circuit explained in this article is not only specified with a continuously variable voltage control but is also equipped with the feature of overload or continuously variable current control.
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