REQ: 12V Power Supply Help

May 09, 2005 1 Replies
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hi all



I've popped the top off my panasonic RX-ES27 stereo CD player



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I've located the power supply, sussed out the +ive and GND terminals on the secondary side and got an output reading of 15.37V



I intend to power the device off a 12V car battery and they usually output



13.8V or thereabouts. does anyone forsee any problems I might have as it's only 1.5V under ? (better than over I suppose)

I intend to cut and bare the + and GND output leads and solder on the appropriate flyleads and route them through the battery compartment onto a fused cigar lighter type plug.



here's the crux of the matter, should I just power it off the battery, neat, with the fused cigar ligher type plug or should I use a regulated 12V gigar lighter plug ?



in the past I've done a similar bodge with crocodile clips to the battery terminals which worked fine, if a bit dodgy. I want this to be a fixed mod for use when camping and boating where there's always a12V DC socket



tia for any help


RT


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R

terminals

It will work, with the addition of one component - a Transzorb such as a

1.5KE16 (1N6276) or so:
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. You should be able to get one at almost any electronics vendor. Put it just like a Zener across the +12/gnd, between the plug and the box, cathode (band end) to +12, and anode (blank end) to ground.

Car +12V is terribly nasty noisy crappy DC - I've heard there can be spikes of 60V or worse. You might even want to add a hash choke and filter cap.

Good Luck! Rich

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