Portable CD Player Adapter For Car

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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.


This is the schematic of the Car CD Player Adapter


Total Qty.
C111000uF 25V Electrolytic Capacitor
C2110uF 25V Electrolytic Capacitor
C311uF 15V Elextrolytic Capacitor
C410.1uF 15V Electrolytic Capacitor
U117809 Or Other Regulator (See "Notes")See Notes
MISC1Cigarette Lighter Plug, Plug For CD Player (See "Notes"), Heat Sink For U1, Wire, Case.


  1. The voltage your CD player needs will determine which regulator you use. For 9V, use the 7809. For 6V, use the 7806. For the unlikely 5V use the 7805. Remember that whatever regulator you use, you will need to heat sink it. The metal case or metal cover on the case makes a great heat sink.
  2. I built the circuit in a small case with the long wire to the cigaratte lighter plug coming out one end, then another, slightly shorter wire going out the other end to the CD player.
  3. Triple check your wiring. You would hate to ruin an expensive CD player because you reversed one of the connections or hooked the regulator up backwards.

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Convert ac circuit into dc of cd and dvd player.
Tuesday, November 29, 2011 12:04:25 AM
Hi everyone, now i'm in a problem with my DVD & CD player. One of it is samsung and other is sony. Now both of it is in AC adapter. But i want to convert it into dc adapter. But both of it supply different voltage like 12v,6v,3v, 9v. What can i do now. Can anybody help me?
Portable CD Player Adapter For Car
Thursday, May 21, 2009 12:52:42 PM
I need to limit the current to 500 mA. Can I add resistors to the circuit to get the reglated voltage at 500mA. Thank you.
Portable CD Player Adapter For Car
Wednesday, March 18, 2009 1:01:23 AM
@haz: I do exactly that with a 7805 and a chopped up "add-on" USB port. I've got a few caps, a diode, fuse, and screw terminals soldered to a piece of perf-board. I take the +5v off of a pin-header that the USB port plugs into... Great idea.
Portable CD Player Adapter For Car
Monday, September 29, 2008 1:30:38 PM
This site has a massive amount of information. I have a problem with a car charger for my blackberry smartphone. I took it apart but there is no fuse, just a circuit board and components. Is there a schematic and directions for me to fix this unit? If so, how and where do I find one? Are there videos showing how to do these repairs? ie: winding wire for the transformer used in the power inverter.
Portable CD Player Adapter For Car
Sunday, January 27, 2008 3:02:51 PM
pleas sir, iwant mixer which uses 20vdc how do iget in
Portable CD Player Adapter For Car
Saturday, January 12, 2008 6:40:24 PM
What kind of U1 if I need 1.5Vdc for my portable mp3 player, if anyone knows the circuit design please post it in this site or send to my e-mail. Thanks
Portable CD Player Adapter For Car
Tuesday, December 11, 2007 11:06:55 AM
can you use you tele recharger for the car on a portable cd player ? I would like all in the car to be able to hear certain lectures from school.
Portable CD Player Adapter For Car
Saturday, August 04, 2007 6:27:03 PM
Hey! Cool project but just for easyness, couldnt you swap c4 for a non-polarized capacitor? Also, if you swap the 7809 for a 7805 regulator at 1.5Amps, you can use it (i think) to charge up nearly any USB device if you substitute the output port for a usb prot and wire the + to pin1 and the Ground to pin4. Anyway Ace site, thanks for the help with the motor controller!
Portable CD Player Adapter For Car
Tuesday, July 24, 2007 11:58:16 PM
WHAT KIND OF U1 that have a no.of this 7809?
Sunaabh Sarkar
Portable CD Player Adapter For Car
Wednesday, June 13, 2007 7:59:22 AM
Hi, Does the circuit take care of spikes generated by the car's power generation unit? Thanks. Sun
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