15V 3A power Supply problem

[sudarshann]

Hi
I am in need of a DC Supply 15V @ 3A.
My requirements are 15V-18V is the limit i need which does not mean i need to vary between the limit. the supply can be with the at limit any value for the device(https://www.hobbyking.com/hobbyking...O6_50W_5A_Balancer_Charger_w_accessories.html).

so i tried with a transformer 0-15V 3A rating i connected a bridge rectifier rated 4A and Capacitor 1000uf
i get a output of 22.XX volt as output. any my device says over voltage.

how can i reduce the voltage to the limit between 15-18 Volt. I tried to find some suitable voltage regulators but i couldnt get them in my local shops.
is there any other simple solution to reduce the voltage. can i use resistors if so what value and power rating.

i know that voltage will drop when the load is connected but this device is intelligent it detects the voltage even before connecting to load.

any solution welcomed

Thank you

 

[goldsmith]

Dear sudarshann
Hi
I think a simple LM2576 can solve your problem as well .
Best Wishes
Goldsmith

 

[sudarshann]

Dear sudarshann
Hi
I think a simple LM2576 can solve your problem as well .
Best Wishes
Goldsmith

LM2576T-XX i think XX is the output voltage i get only values for 5v and 12v in my area for almost all kinds

but i get lm7815

can i parallel 3 of them for 3A ?

 

[goldsmith]

It has a famous Family ! LM2576 ADJ . you can use a potentiometer control your out put voltage in desired value .

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BTW : 7815 , will has large value of dissipation .

 

[sudarshann]

ok i will try to get that

Thanks very much for your help