regarding amplification

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for giving bias for the LM 675(operational amplifier) , i need a dc supply of +30 and -30 volts. but this is not avilable in my laboratory. by using transformers and rectifiers is is possible to get the required +30 and -30 volt dc voltage. please give me the suggestion and give the necessary diagrams.
please help me.
thanking you sir.
 

sir,
i am using LM675 for the purpose of amplification,but it needs +/- 30 volt dc upply, but in my lab only +/- 15 volts is avilable. please suggetion how to get the +/- 30 volt dc voltage.
 

i tried in internet for getting the circuit diagram, but i could n't. please give me the circuit diagram for the dual 30 volt dc supply by using transformer , rectifier and using filtering capacitor.
 

Here's one way to do it.




The current rating of the transformer's secondary should be twice the d.c. required.



If you have difficulty finding a transformer with a 48V secondary, you can do it with two x 24V.




The current rating of the transformers' secondaries should be 1.6 x the d.c. required
 

i tried the second circuit. i used an auto transformer before the two transformers for the purpose of varying the voltage. i have used a 1000 micro farad,160 volt capacitor, but when i varied the voltage ,after getting 17 volt dc across the capacitors , both capacitors blown. please suggest me the correct rating of the capacitor to use, and what may be the reason for the blown of the capacitor.
 

The capacitors should have a voltage rating of rather more than the expected d.c. 50V ones, or more, would be suitable.
 

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