Here is the circuit diagram of regulated power supply. It is a small power supply that provides a regulated voltage, adjustable between 1.5 and 35 volts at 1 ampere. This circuit is ready to use, you just need to add a suitable transformer. This circuit is thermal overload protected because the current limiter and thermal overload protection are included in the IC.
Picture of the circuit:
Circuit diagram:
Transformer selection chart:
Parts:
IC = LM317
P1 = 4.7K
R1 = 120R
C1 = 100nF - 63V
C2 = 1uF - 35V
C3 = 10uF - 35V
C4 = 2200uF - 35V
D1-D4 = 1N4007
Features:
- Just add a suitable transformer (see table)
- Great to power your projects and save money on batteries
- Suitable as an adjustable power supply for experiments
- Control DC motors, low voltage light bulbs, …
Specifications :
- Preset any voltage between 1.5 and 35V
- Very low ripple (80dB rejection)
- Short-circuit, thermal and overload protection
- Max input voltage : 28VAC or 40VDC
- Max dissipation : 15W (with heatsink)
- Dimensions : 52x52mm (2.1” x 2.1”)
Technical Specifications
- Input Voltage = 40Vdc max Transformer
- Output Voltage = 1.5V to 35Vdc
- Output Current = 1.5 Amps max.
- Power Dissipation = 15W max (cooled)
Note:
- It has not to be cooled if used for small powers. 28 Volt AC max is allowed for the input voltage.
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6 comments:
I am sure fans must have got impressed with this blog!!!
Hi Izhar Fareed ..
I apologize for having deliberately taken an article on your blog. Please corrected again if I had taken the article in your blog without including the source.
Success for you and thank you...
Dear Bhai...!!! How we calculate the value of capacitance in our simple Dc supply..!! As we have used a 12 v and 1 amp transformer and we want the output DC adjustable voltage between 0-12v...!! So I had a problem ...!! So kindly tell me how i calculate the value of capacitance...?? Is any formula or theory behind it...!!!
HASEEB ASLAM
@Haseeb
Which circuit you are using ?
according to pin diagram of lm317 regulator 1st pin is adjustable 2nd pin is output pin 3rd pin is input pin. here in the above circuit it is been connected wrong.
Hi,
The "317" not only has been manufactured by dozens of companies, it has also been made in various casing styes. It's always the safest option to check the datasheet of the producer of exact device we hold in hand. If he author of the article has decided to share the pinout, there should be the statement that it may be differend.
By the way, there is a mistake in transformer table. Should be 38V instead of 28.
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