I need help with the LM338 variable voltage regulator circuit.http://www.google.co.in/url?sa=t&rc...YI1HakR9ZkIWVlw&bvm=bv.48175248,d.bmk&cad=rjaI'm building the one with the improved ripple rejection
I'm using a 24v 3A transformer with a bridge rectifier and a 4700µF filter capacitor at the input and I'm having trouble deciding the values of R1 and R2.I would like an output of around 3-20v(+/- 2v at the input and output).The circuit in the datasheet uses a 5k pot.However the potentiometer I have is marked 4.7k,but when measured is close to 7k.So if I use a 10k pot what should be the value of R1?What would be the output current of this setup?Also can the tantalum capacitor at the output be replaced by an electrolytic capacitor?If so then what should be the value of the electrolytic capacitor?
Thanks.
I'm using a 24v 3A transformer with a bridge rectifier and a 4700µF filter capacitor at the input and I'm having trouble deciding the values of R1 and R2.I would like an output of around 3-20v(+/- 2v at the input and output).The circuit in the datasheet uses a 5k pot.However the potentiometer I have is marked 4.7k,but when measured is close to 7k.So if I use a 10k pot what should be the value of R1?What would be the output current of this setup?Also can the tantalum capacitor at the output be replaced by an electrolytic capacitor?If so then what should be the value of the electrolytic capacitor?
Thanks.