Need Components equivalent for General purpose power supply circuit

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     I am a undergraduate student who is interested in design and development but money and availability of components is problem here.

Thank you sir for your threads. Xavier sir can you recommend rps specification and circuit.. Thank you...

[xavier60]

The PSU that I actually built uses a transformer with two 15VAC 3A secondary windings that are configured as parallel or series to suit the output voltage.   I allow it to supply up to 5A on the low voltage range and 2.5A on the high voltage range as it is fan cooled. It has two TIP35C BJTs on a large fan cooled heat sink.
I don't see any ripple  with my DSO in CV mode, a little ripple in CC mode.
https://www.eevblog.com/forum/projects/linear-lab-power-supply/msg2388873/#msg2388873
The last few pages of the threads that I linked have some useful information.

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Thank you all.....

[xavier60]

If you build this design, let us know when you are ready to test it.

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Definitely sir.. Thanks a lot...

[Infrared_Fred]

Ia am interested in building the (originally mentioned in this thread) power supply design, but I don't need or want the 10A capabilty (too much power to worry about).  To scale the current back to say about 5 amps or so, could I change the 0.1 resistor to 0.2   or 0.22 and posibly reduce to 4 LM395s in parallel rather than 7? Any other mods nessacery for this?

Thanks!

P.S. Sorry if this seems rude, but I would please like the question awnsered, rather than just something like "look for a different power supply design". Again, Thanks!

[bdunham7]

Ia am interested in building the (originally mentioned in this thread) power supply design, but I don't need or want the 10A capabilty (too much power to worry about).  To scale the current back to say about 5 amps or so, could I change the 0.1 resistor to 0.2   or 0.22 and posibly reduce to 4 LM395s in parallel rather than 7? Any other mods nessacery for this?

Yes, this is a reference design and it is provided so that you can understand it and then modify it.  Increasing the sense resistor is one way, but try to understand what each part of the circuit does and you'll see that there is more than one way to accomplish what you want.  Also keep in mind that this circuit will dissipate quite a bit of heat, especially with a high current at a low output voltage.  Also, you need to provide the unregulated but filtered V+, the V- and you have to be mindful of the absolute maximums for the op-amp power supplies.  A transformer supply that yields 30VDC under full load might give you 42VDC no-load, and that's too much. 

[Infrared_Fred]

In regards to the power supply, I was thinking that this one or this one and this one together.  Both of the 36V power supplies specify that they can be adjusted down to ~32-33V so I would probably use that option to save on unnecessary power dissipation, and/or I may add a capacitance multiplier to reduce switching noise on the power supply which would drop a volt or two. 
Thanks!

[bdunham7]

In regards to the power supply, I was thinking that this one or this one and this one together.  Both of the 36V power supplies specify that they can be adjusted down to ~32-33V so I would probably use that option to save on unnecessary power dissipation, and/or I may add a capacitance multiplier to reduce switching noise on the power supply which would drop a volt or two. 
Thanks!

That's an interesting way to do it--is it cheaper than a regular transformer?  The first one looks ideal--the isolated 5V part can be connected for the -5V part.

[Infrared_Fred]

In regards to the power supply, I was thinking that this one or this one and this one together.  Both of the 36V power supplies specify that they can be adjusted down to ~32-33V so I would probably use that option to save on unnecessary power dissipation, and/or I may add a capacitance multiplier to reduce switching noise on the power supply which would drop a volt or two. 
Thanks!

That's an interesting way to do it--is it cheaper than a regular transformer?  The first one looks ideal--the isolated 5V part can be connected for the -5V part.

Based on the ~$70 of the capacitors + transformers + rectifiers of the transformer "source" power supply vs the $~78 of the switching power supply + capacitance multiplier + cooling fan (see .xslx attached Digikey carts for both), I think I would rather go with the  SMPS  since the price is only really different by $3-4 for the capacitance multiplier since the fan would be necessary on the chassis anyway even for the linear and the SMPS is going to be lighter and *probably* more efficient. 

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Which mode of operation is better ? In case of Cost and complexity?
                                  Switch mode power Supply or Linear mode power Supply...


You all can give working Circuit using Switching Regulators for my specification(30V @ 5 amps).

My application is Designing Amplifier for Audio frequency and Charge my Battery which is used in Inverter(12V 10 amps)