# How to build Circuit

Discussion in 'General Electronics Discussion' started by EFDG, Jun 15, 2016.

1. ### EFDG

33
0
Jun 11, 2016
Hello,
If the supply is 24V and we need 8V at more current like 8A using than linear regulator what we can design how?
like voltage divider.

2. ### BobK

7,682
1,688
Jan 5, 2010
The only way to get more current out than in is with a SMPS (switch mode power supply).

Bob

HellasTechn and hevans1944 like this.
3. ### hevans1944Hop - AC8NS

4,615
2,154
Jun 21, 2012
And you should also make sure that the 24 VDC power source can provide enough current to operate the SMPS that delivers 8 VDC at 8 A. That is 64 watts of output power, so input power capability needs to be about 70 watts (assuming about 90% SMPS efficiency) or about 3 A capability from 24 VDC power source. If more current is available from the 24 VDC source, say 8 to 10 A, then you could use a series linear regulator, but a lot of power would be dissipated (as heat) in the regulator: (24 - 8)(8) = 128 watts. That is why the SMPS solution is better because only about 6 watts is "thrown away" as SMPS inefficiency.

However, @EFDG you haven't told us what you are trying to DO. Perhaps there is a "better" solution,,, small animals in a rotary cage driving a generator perhaps?

Harald Kapp likes this.
4. ### EFDG

33
0
Jun 11, 2016
I am learning how to increase it current and learn how to design it.