Referring to elog entry QIL:2387. I did the correction with the voltage supply and now provided a supply of 18V(+/-) to LM7815 and LM7915. The position of diodes was also corrected for LM7915. The Electrolytic Capacitors(100uf) I am using are getting heated when using with LM7915 only. I didn't find any tantalum capacitors of 100uf in EE shop. Should they be replaced with some other capacitors?
Attachment 1: The Circuit Diagram Voltage regulator
The component used Input Voltage Output Voltage
a. LM7915 -18 V -15.1 V
b. LM7815 18 V 14.86 V
c. LM317 18 V 17 V
Attachment 2: Output Voltage noise of regulator circuit
The noise observed using SR785 at the output of each regulator.