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.

Schematic

Parts

Part	Total Qty.	Description	Substitutions
C1	1	1000uF 25V Electrolytic Capacitor
C2	1	10uF 25V Electrolytic Capacitor
C3	1	1uF 15V Elextrolytic Capacitor
C4	1	0.1uF 15V Electrolytic Capacitor
U1	1	7809 Or Other Regulator (See "Notes")	See Notes
MISC	1	Cigarette Lighter Plug, Plug For CD Player (See "Notes"), Heat Sink For U1, Wire, Case.

Notes

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.

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.

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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Munna 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?

anonymous 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.

Kevin 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.

chris 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.

anonymous 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

moffat 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

anonymous 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.

Haz 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!

genesis 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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Munna	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?
anonymous	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.
Kevin	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.
chris	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.
anonymous	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
moffat	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
anonymous	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.
Haz	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!
genesis	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