Electronics > Beginners
Secondary current rating of a center tap transformer?
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techguru:
Thank you all. Please suggest regulated power supply circuit which has both current and voltage control(0-3A and 0-24V). thank you..
techguru:
Good After noon to all,

Please suggest voltage and curreng control IC for  regulated power supply circuit which has both current and voltage control pins (0-3A and 0-24V). thank you all.
mariush:
What's the point, if you're not going to understand the circuit anyway, based on the questions...  you want someone to give you the solution to the problem directly, no effort on your part

A simple start would be a simple google search using terms like "adjustable power supply schematic"  and maybe replace adjustable with linear (as opposed to switching)...

I'm attaching a bunch of schematics which use simple opamps/comparators/whatever and transistors allowing you to control voltage and current, no single chips ...

most can be adapter for higher voltages or whatever (for ex. the 18v one can work with 24v), and the hp one has a lot of useful info.
techguru:
Mariush sir,

                It will be useful if you give some video which explain current control. Voltage control is possible with normal LM317 Regulator but when we go for current control there is less explanation and literature to explain .thank you sir for schematics but you are correct with out understanding the schematic , it will not be usefull for construction.
mariush:
Current control in a very simple explanation : you monitor the current flowing through the output wire and you measure it. If the amount is too high, you restrict the voltage overriding if needed the set voltage.

In all the schematics I uploaded, you'll see a resistor somewhere on the output wires, with a very small value, like 0.01 ohm for example  (R57 0.1 ohm in the 18v schematic, R38 in the picture schematic) .... that's the "current shunt" ... when current goes through it, there's a voltage drop across the resistor  (because formula v = i x r  ... so you have a fixed r , and depending on current (i) the voltage changes)

This tiny voltage is amplified using one opamp to some level and then its compared with another voltage  (for example in the picture attached, see the second opamp where you have the course and (optionally) fine potentiometers for current) and if the voltage is higher than what's set using potentiometers, a signal is sent to reduce the voltage output  .... and it keeps going in a loop reading the current comparing to current set until current output is equal to current set
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