0-30 VDC Stabilized Power Supply 0.002-3 A

[Mayoral]

Thanks again!

 

[shoown]

It seems so complex to make a pcb.

 

[audioguru2]

There is (or was) a Greek kit available and today there is a Chinese copy of the Greek kit. The kits have a pcb. If you use a kit then you can cross your fingers and hope that one of its many overloaded parts do not fail soon.

 

[reekoazil]

Thank you very much! I see what you mean, it is not only changing few component.... I have almost every component I may make it next new project ! 

Since I was curious I was digging the forums and the web an I came across a very similar schematics. In this one, Q1, R13 and R14 have been included back to "mitigate transient surge issue". Since you look pretty knowledgeable (and my knowledge that does not go that far), do you have an opinion in this incorporation? Will it affect the overall performance of the supply?

Thanks in advance again for your time and comments.View attachment 42696

Sir, Is it ok if I use a 30V from the secondary output of a transformer or It must be a 24V secondary output.  Sorry I am new in understanding what a 28VAC transformer means.

 

[audioguru2]

I can buy a transformer with any voltage that I want. A 28VAC one or a 30VAC one will work in this modified circuit and the circuit will have a maximum regulated output of 30VDC at 3A.

If you use a transformer that is 24VAC then the maximum regulated output from this modified circuit will be about 25VDC at 2.5A, and if the voltage and current controls are at maximum then the output will produce lots of unregulated ripple.

 

[gixap92915]

Yes, I have been forced to change the shunt resistor. Now this place metal shunt 10A / 0.1V.Thus I am saving me 1.4V. Plus something like 0.5V to have 10 emiter resistor in parallel. Low Vdrop is because the shunt is bolted directly to the output. And the sensing cable to the out.

Sir, I'm sorry but can you share the scheme you used?

Thanks.