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Thread ID: 49379	2004-09-17 10:46:00	Car radio in a computer.	willie_M (5608)	Press F1

Post ID	Timestamp	Content	User
273250	2004-09-18 09:18:00	>can i not put it like, so the speakers out on the radio run through like, a resistor or something then into the soundcard? if the radio dosn't have rca outputs there is a speaker to rca converters advailable which will do that. however its still far better to use a radio that has rca outputs.	tweak'e (174)
273251	2004-09-18 10:54:00	Stick an old card in there and you should be able to confidently pump the end of the world through it. Well maybe not quite, but it should be quite isolated from the motherboard. For example, a 24V current -> line in will not kill the motherboard, just the sound card. It will hit the audio components, kill them and stop there. But if you keep the volume down low it should work OK. Most audio devices are *reasonably* tolerant - I have never had problems putting speaker outputs into a line input at any volume.	george12 (7)
273252	2004-09-18 11:18:00	> But if you keep the volume down low it should work > OK. Most audio devices are *reasonably* tolerant - I > have never had problems putting speaker outputs into > a line input at any volume. But if the radio has a high output (pumped power source) speaker circuit, then you have no ability to ground the speaker negative without causing major damage. That means you cannot connect it to the sound card (well, only one side of the speaker can connect and thats not going to work) A sound card is no more isolated than on-board sound in this respect. A typical sound card input is 1 volt, 10,000 ohms. The speaker is ~12 - 18v (or more) but at 4 ohms. These will give a higher level of distortion, (but probably not so noticeable with the intended music?) but its the fact that the ground wire of the speaker will be several volts negative to ground (possibly). Large and destructive currents will flow. But it depends on the radio type.	godfather (25)
273253	2004-09-19 03:49:00	OK, well maybe I should have done this a while ago, but here's what written on the side of the thing... OK, now I know why I didn't do it before.... theres nothing written on it. :D However it aint no hot shot radio... its the standard(?) alpine tape/reciever 7179EZ out of a 1990 toyota corolla (my new car :D). Should provide too much power should it? And how do i tell if the speaker negative isn't grounded or watever?	willie_M (5608)
273254	2004-09-19 04:22:00	Simple questions. How may wires out the back of the radio for the car speakers? 3 or 4? (i.e. is the negative lead for the speakers common to both left and right, or is it a separate wire for each?) Is the speaker negative wire(s) connected to the case of the radio. Use a multimeter to check. Should be 0.2 ohms or less.	godfather (25)
273255	2004-09-19 04:36:00	There are four... what kind of f88ked up radio would have 3? Dunno whether its connected to the casing, can't find the multimeter....	willie_M (5608)
273256	2004-09-19 06:03:00	A lot of lower powered radios with negative grounded speakers would have 3. Only 3 are needed, R, L and Ground. If yours is actually negative grounded, then both the speaker negatives will *probably* be electrically connected together inside the radio. But if you can't be bothered to find out, we cant make you. Or advise you.	godfather (25)
273257	2004-09-19 07:38:00	I admire your patience GF . You and others have tried to help this person, with valid helpful information, which he seems unable to accept or understand . It's hopeless, and so I guess it's time to discontinue advising on this thread, but I'm sure PF1'ers will value your continuing advice .	Bazza (407)
273258	2004-09-19 09:29:00	Don't be too harsh Bazza, Willie is only a kid. You have to be patient with them while they are young and silly. :p :D	Susan B (19)
273259	2004-09-19 09:30:00	> Willie is only a kid . Well, I think he is, anyway! :D	Susan B (19)
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