These are simple 12V 5V power supply circuit, We have many ways to builds DC power supply for CD-ROM Drive or HDD.
12V 5V power supply circuit using 2N3055 and LM7805
This circuit can deliver DC voltage of 12V and 5V. Which it uses a base parts 2N3055 and Zener Diode-12V. We have to use the input voltage of 15V up. Make can take volt can reach about 15V maintain one’s position voltage be stable 12V well.
And change the integrated circuit LM7805 for regulating about 5V for apply to Digital Circuit general get. For C3-0.1uF filter, the frequency disturbs all well. For other detail, friends see in the circuit.
Note: In this circuit, we use LM309K(ancient) which it is the same as the popular LM7805(Now).
Convert two-level DC voltage 5V, 12V
The working principle circuit, start with the AC-line or the electric Current power is fed to this circuit to the transformer T1. Which It will convert AC to lower voltage 9-volts will be switched from AC power into DC with D1-D4 connected to circuit Rex Comment fire Bridge Terminal. (Bridge-Rectifier)
Then, the capacitor C1 will filter to smooth the DC current, which at this point can use the output voltage approximately 12 volts. The output level will flow to diode D5, it acts as to prevent spike voltage through the connection of the output.
Then, the DC current flowing into pin 1 of IC1. Which it acts as the regulated voltage of 5 volts out in pin 3 of IC1, the output level.
The second capacitor C2 and C3 is a current filter to smooth more.
Parts you will need
D1,D2,D3,D4,D5___1N4007___1000V 1A Diodes
IC1______________IC-7805___5V DC regulators IC
C1_______________470uF 25V___Electrolytic capacitors
C3_____________0.1F 63V Polyester Capacitor
T1___________230V AC primary to 12V,1A secondary transformer
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