Search found 41 matches

by zmwworm
Fri Mar 07, 2008 9:36 pm
Forum: General Discussion
Topic: Question about relay voltage
Replies: 51
Views: 11011

Question about relay voltage

I bought some relays to use with some roll bar lights on my truck. I tested them with a 12V battery to make sure that they would work, and started soldering everything together when I noticed two different voltages on the label. The label is as follows: 896H-1CH-D1 Coil:12VDC 50A/30A 14VDC I don't k...
by zmwworm
Sat Feb 09, 2008 11:33 am
Forum: General Discussion
Topic: Questions about amps and automotive components
Replies: 26
Views: 7722

Here'e what I had in mind. This a rough draft I used for SPICE simulation, but you get the idea. Thanks, that's (obviously) more than I could ever come up with. I may not get the idea as well as you think, I have made a window comparator before but I did not understand how it worked. I'll probably ...
by zmwworm
Fri Feb 08, 2008 12:48 am
Forum: General Discussion
Topic: Questions about amps and automotive components
Replies: 26
Views: 7722

So here's my revision. Would this work, would a diode serve any purpose here? None You've dashed my hopes and dreams of a career in electronics! I was hoping for a more elaborate criticism or ridicule, maybe I should be more direct? The diode would prevent any positive voltage from reaching the tra...
by zmwworm
Thu Feb 07, 2008 10:10 pm
Forum: General Discussion
Topic: Questions about amps and automotive components
Replies: 26
Views: 7722

At first the sender had up to 1,000 ohms at idle, but as the oil warmed up further it either flucuated faster and to higher resistances than I could keep up with, or it shut off (the gauge was off, so this was probably the case.) Resistance increases with engine speed (and oil pressure)? As oil war...
by zmwworm
Wed Feb 06, 2008 10:09 pm
Forum: General Discussion
Topic: Questions about amps and automotive components
Replies: 26
Views: 7722

After my last post I noticed that the diagram should have the light above the relay and be powered from the light rather than the new fuse. 20 ohms seems very low. We still need to know the value of the gauge's resistance, or more accurately, the voltage from the sender under min-normal-max oil pres...
by zmwworm
Tue Feb 05, 2008 6:39 pm
Forum: General Discussion
Topic: Questions about amps and automotive components
Replies: 26
Views: 7722

I would expect the oil sender is on the engine block, not under the dash. You can run a temporary cable (speaker wire wil work) from the sender to the cab and use your DMM (as a voltmeter) to monitor the sender while driving. (Safety first, of course). In order to measure the voltage the sender nee...
by zmwworm
Mon Feb 04, 2008 10:37 pm
Forum: General Discussion
Topic: Questions about amps and automotive components
Replies: 26
Views: 7722

Use your voltmeter (DMM) to measure the voltage from sender to ground at different oil pressures (engine speeds). That measurement is going to have to wait until I get a chance to take apart the dash. The relay is a good idea, but to drive the relay you'll need an amplifier, one that doesn't load t...
by zmwworm
Sat Feb 02, 2008 11:47 pm
Forum: General Discussion
Topic: Questions about amps and automotive components
Replies: 26
Views: 7722

Okay, new stuff here but it's still about my truck. I've been trying to get my gauges and stuff working and it looks like I've got just about everything. Except for probably the most important dash component, and that is the idiot light. The problem is that I'm not exactly sure what year of engine I...
by zmwworm
Tue Jan 22, 2008 11:43 pm
Forum: General Discussion
Topic: Questions about amps and automotive components
Replies: 26
Views: 7722

As this is a bit more advanced, and may take some experimenting, you can leave this to later, just run the LEDs from an "always on" 12V feed (via a fuse). That's what I was planning on. If I was going to spend extra time working on my electrical system, I would try to get the horn and stereo workin...
by zmwworm
Sat Jan 19, 2008 11:39 pm
Forum: General Discussion
Topic: Questions about amps and automotive components
Replies: 26
Views: 7722

Re: Questions about amps and automotive components

One other thing, your OEM dash probably has a dimmer to change the brighness of all instrument lamps. If so, you can tap into that circuit and have your new pilot lamps also dim. I thought of that, but I would like to be able to use these lights with the ignition and headlights off. I could run the...
by zmwworm
Sat Jan 19, 2008 1:15 pm
Forum: General Discussion
Topic: Questions about amps and automotive components
Replies: 26
Views: 7722

Re: Questions about amps and automotive components

Thanks for the thorough reply! Greetings (No Name Supplied), What's the point in a username if everyone is going to sign their posts anyway? Besides, "Zach" is probably too common for me to get on every webboard, and I want to use the same name for everything. I suspect the 12V nominal, 16V max. spe...
by zmwworm
Sat Jan 19, 2008 1:09 am
Forum: General Discussion
Topic: Questions about amps and automotive components
Replies: 26
Views: 7722

Questions about amps and automotive components

I have some questions regarding amperage with some components that I want to use in my truck. First, I found some indicator-lamp enclosures that have LEDs and resistors built-in. They are rated at 12v normal, 16v max, and something like 20ma. Am I right in assuming that these will work fine running ...
by zmwworm
Mon Jul 16, 2007 11:03 pm
Forum: General Discussion
Topic: What FM transmitter setup to use?
Replies: 16
Views: 5029

(To restate, perhaps nobody noticed this post on the first page, and I would like some help.) Just wondering how far away you want to be able to drive your car before losing the signal. Sitting in the driveway? I've gotten up to about 1 mile but that's it. You've gotten a mile using what transmitter...
by zmwworm
Fri Jul 13, 2007 12:01 pm
Forum: General Discussion
Topic: What FM transmitter setup to use?
Replies: 16
Views: 5029

A better option is a Casette adapter or a line in cable (either to the head unit or to an amplifier) THey are convenient if you don't have a casette or line in plug and don't want to upgrade your radio or if you want to play it in a rental or friends car which you can't modify. I know several peopl...
by zmwworm
Fri Jul 13, 2007 11:47 am
Forum: General Discussion
Topic: What FM transmitter setup to use?
Replies: 16
Views: 5029

Hi there, Just wondering how far away you want to be able to drive your car before losing the signal. Sitting in the driveway? I've gotten up to about 1 mile but that's it. You've gotten a mile using what transmitter? Special antenna, perhaps? I'm mainly thinking about having the transmitter in my ...