Dual Adjustable Power Supply Using LM 317 & LM337
Dual Adjustable Power Supply Circuit
Description
This is the circuit diagram of a dual adjustable power supply using IC’s LM 317 & LM 337.LM 317 is able to deliver a maximum of 1.5 A at a range of 1.2 V to +30V .LM 337 is the negative complement of LM317.They also have a built in short circuit protection.
Here the circuit is wired to produce a dual adjustable output of ( +15 , 0 , -15 ).The capacitors C1 to C8 provides filtering and ripple rejection.Resistors R1 & R2 controls output of LM 317.Resistors R3 & R4 controls the output of LM 337 .R1 and R4 can be turned to vary the positive and negative voltages.This circuit is a must on an electronic hobbyists workbench.
Notes
- The transformer should be anything that produces a min of 3 A with (24 0 24 ) output voltage.
- The voltage range can be further increased by increasing transformer output within the limits of IC.
- Do not connect a load drawing more than 2A at output.The IC,s must be fitted with heat sinks for better protection.
Parts List
C1, C2 2200 uF 50V Electrolytic Capacitor
C3, C4, C5, C7 2.2 uF 50V Electrolytic Capacitor
C6, C8 100 uF 50V Electrolytic Capacitor
R1, R4 5K Potentiometer
R2, R3 220 Ohms 1/4 W Resistor
D1 to D4 IN 4007 Diodes
U1 LM317 U2 LM337 T1 24 0 24 Center Tapped 2 Ampere Transformer
S1 SPST 2 Ampere Switch
Extra Heat sinks for two IC’s , Power Cord, Casing, Wire etc
Dual Adjustable Power Supply Circuit Diagram.
Dual power supply circuit
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Hi can I ask if this would be suitable, I need a supply with +20v DC and -20v DC it is for an audio pre-amplifier, would I still need to use a 24-0-24v transformer or could I use one with lower voltage and also would the transformer need to be such high current?
Thanks
Gary
Hi there!! Was wondering about the caps. Are they meant to not have a junction on the ground? Having trouble getting the lm337 to work..
Regards
Eujean
Hi Eujean the junctions of C1, C2; C3, C4; C5, C6; C7, C8 to be connected to common GND. The dots are missing. The circuit is correct and will work.
[...] oscillators and ICs like the 555, logic gates, etc.). Something similar to what you see here: http://www.circuitstoday.com/dual-ad…g-lm-317-lm337 My question is about grounding the various parts of the circuit. The common on the components just [...]
Hi Normally zero volt reference bus should be connected to ground, where the requirement is both positive and negative voltage like op-amp IC audio amplifiers etc .
hi every one
there’s something abt that circuit i have used all the components but the output is abt 27.7 -27.7 v insteade of 15 -15
and i doesn’t starts at 0 v , it starts at 1.6 v
how to make the display of power supply digital
Hi Shahid you can use standard 200mV 3 1/2 or 4 1/2 panel meter modules with its own separate power supply 5 or 9 volt and suitable multiplier and shunt resistance to convert the input to the required 200mV range.
sir
is there a way to buit dual power supply using only lm 317??
Hi Rahul use two seperate windings in the transformer or use two independant transformers make two supplies and use then in series. you may follow the circuit shown below
http://mynerdstuff.blogspot.in/2012/01/power-supply-variable-with-lm338.html
yes i have done it as part of my project bt it will give two positive dc supplies
sir
can we built dual power supply using only lm 317 ???
regards
rahul
HiRahul With LM317 & 337 YOU CAN USE A SINGLE CENTER TAPPED TRANSFORMER. IF YOU WANT TO USE 2 lm317 YOU REQUIRE A TRANSFORMER with 2 independabt secondaries and 2 rectifier and filter circuits to takecare. it will become 2 independant supplies in sereies.
hi every one has any one assembled this circuit ?? anyway can any one tell me instead of using lm337 can two lm317 be used…???
are the heat sinks completely necessary or will it work fine without them?
Thanks alot i have got more help
good work God bless you
The R1&R4 where is it going to conect…..
is it short circuit or what