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Category: Inside Circuits Views: 3717 Rank: 10 This is a high quality power supply with a continuously variable stabilized output adjustable between 0 and 30VDC. the LM 723 is the heart of the power supply which drives the BD137 and then the 2N3055. The circuit provides short circuit protection. And has great stability at voltage changes.  Drive the circuit with 24 Volts 3A from a transformer. the 2N3055 needs a good heat sink. Datasheet file1: Click here to download BD135.pdf datasheet. Datasheet file2: Click here to download LM723.pdf datasheet.
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The post explains a simple variable transformerless power supply circuit which is also surge protected and suitable for relatively high current applications.
It can be used in applications such as adjustable power supply, constant current regulator, battery chargers etc. A high current variable supply is essential to test high power amplifier circuits, during trouble shooting or ...
This circuit diagram shows you how to make a 5V to 12V variable DC power supply from a fixed 5V regulator IC 7805. This is attained by adding two resistors R1 and R2 as shown in figure. When the resistors R1 and R2 are ...
Dual rail Variable DC Power Supply Circuit. * The circuit can be placed into the existing Variable DC Power Supply metal cabinet. * Q1 and Q2 must be mounted on heatsinks. Usually, bolting them to the metal case (through ...
The most important part of this circuit is the 317 variable voltage regulator. The 317 is a monolithic integrated circuit with adjustable 3-terminal positive-voltage regulator designed to supply more than 1.5 A of load current with ...
A variable dc power supply is one of the most useful tools on the electronics hobbyists workbench. This circuit is not an absolute novelty, but it is simple, reliable, "rugged" and short-proof, featuring variable voltage up to 24V ...
#4 Building My Own Variable Power Supply Bench Top Style 0-96VDC 10A-40A
Our New LM317 DC-DC Variable Power Supply Module - A Demonstration Video
Comments
JORGE RESTREPO wrote on Jun 1, 2008
TRANSISTOR BD 135 IS INVERTED. MALFUNCTION.FAILURE..FAILURE
for project wrote on May 2, 2009
for collage use
Electronic wrote on May 11, 2009
BD 135 miror .. Bd 135 emitter connec to 2N3055 beyz
from russia wrote on Sep 27, 2009
Max output is only 15v depending by internal LM723 stabilisizer from pin 6.
aussie-knows-how-it-works wrote on Apr 22, 2010
Output will theoretically reach 30V but the current limit is a bit of concern! 4 amps by my calculation which could result in destruction of the 2N3055 even if it is mounted on the largest of heatsinks when the output voltage is set low and current limit is reached. Urgh.....who designs such crap?
KASHISH TANEJA wrote on May 3, 2011
we had worked out on this circuit and we found few faults in it , the connection of transistor bd135 is wrong , it is to be like that in place of emmitter it will be coollecter and vice-versa and in it we will use a 15-015 transformer....
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