Portable CD Player Adapter For Car

Whenever I'm in the car listening to my favourite CD, it always happens; my batteries go dead. To solve that problem, I built this extremely simple regulator circuit. It steps down the 12V from the lighter socket to 9V which is used by the CD player. Different CD players (I have a Sony Discman) may require different voltages, so just use the correct regulator. All the 78xx series regulators have the same pin out, so the circuit is universal.

Parts

Electrolytic capacitor

C1     1000uF 25 v

C2     10uF     25 v

C3     1uF       15 v

C4      0.1uF   15 v

IC

U1     7809

Mics  

Cigarette lighter plug,plug for cd player

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