adrian22 said:
An AC input 230V is supply into the supply starting from the 1A fuse to the on/off switch then to the center-tapped transformer (15-0-15V). After going though the center-tapped transform, the voltage drop down from 230V AC to 15V AC.
The voltage is dropped down from 230V AC to
two 15V AC outputs.
Then the 15V AC will be connected to the bridge rectifier and rectifier to a fullwave +15V and –15V.
From there a +15V will be supply to C1 anode (2200uF, 50V) and provide the output of +15V DC. Same thing, a –15V is supply to C2 cathode (2200uF, 50V) and due to ground is higher voltage with respect to –15V.
Then the 15V AC outputs allow the bridge rectifier to charge C1 and C2 with full-wave to the peak voltage less a diode drop of about +20VDC and -20VDC. (These 15V regulators operate poorly if their input voltage is less than 18V).
....LM7815....LM7915....LM7905
An LM7815, LM7915 and LM7805 regulator can supply up to 1.5A of current. Your last schematic shows 78L15, 79L15 and 79L05 regulators that can supply only 100mA. Which regulators are you using?