Wednesday, July 11, 2012

Adjustable Power Supply 1.2 – 30V 5A using LM338

If you want to a variable dc voltage power supply circuit during 1.2V to 30Vdc and can provide a current maximum to 5A.

We may be have the many ways such as: to be modified the LM317 Variable Regulator 0-30V 1A by add the power transistor MJ2955 in circuit following Power supply regulator 1.2V-20V and 3V-6V-9V-12V 3Amp or will build the Variable dc regulator 0-30V 5A circuit to be well as well, But these methods. Rather cumbersome and wasting too money.

Adjustable Power Supply 1.2 – 30V 5A using LM338

However we can build this circuit easily and cheap, By using the packages IC No. LM338 only one, Similar to the LM317 IC number, but it can supply up to 5A, as the circuit shown in Fig.

How this circuit works
-The transformer T1 converts the AC 220V to 24 Vac, so be rectified the current by the bridge diode rectifier BD1 – 10A 400V. Until DCV has come out that the filter capacitor C1 is equal to 35 volt.
-The IC1 is the heart of the operation of this circuit. By the voltage output value obtained from the IC depends on the voltage value at the Adj pin of IC1, or can be varied by adjusting the VR1.
-However output voltage will be approximately equal to 1.25+1.25VR1/R1
The output voltage at the output pin of the IC1 is a more powerful filter with the capacitor C3.


  1. Is there a variation of this circuit to produce upto 400vdc ?

  2. There are a number of different power supplies for electronic devices available, these are usually split into two different types line-frequency and switching power supplies. A line-frequency supply is generally a reasonably straightforward design, but it becomes progressively bulky and hefty for high-current equipment as a consequence of requirement for large mains-frequency transformers and heat-synced digital regulation circuitry.

    Redundant Power Supply

  3. Amazing, your good i really understand.

  4. I would like to ask you, the C1 value is 10F? Thanks

  5. These DIY circuits are so useful thank you very much


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