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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.|
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|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?|
|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.|
|@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.|
|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.|
|pleas sir, iwant mixer which uses 20vdc how do iget in|
|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|
|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.|
|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!|
|WHAT KIND OF U1 that have a no.of this 7809?|
|Hi, Does the circuit take care of spikes generated by the car's power generation unit? Thanks. Sun|
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