Search found 39 matches

by Tparker
Wed Apr 21, 2004 8:47 am
Forum: General Discussion
Topic: Led Constant Current driver help
Replies: 8
Views: 2097

Re: Led Constant Current driver help

Dale Y,<p>I saw that but I am not sure how that helps in my situation. When the transistor is on you say it shorts the cntrl/ref. circuit, the way I see it that would turn the current off. Not sure what i would be gaining?
by Tparker
Tue Apr 20, 2004 11:24 am
Forum: General Discussion
Topic: Led Constant Current driver help
Replies: 8
Views: 2097

Re: Led Constant Current driver help

Edd,<p> Thought about using relay, but had reliability issues. But I guess its better to KISS. I think I can get by with one DPST relay, one resistor, and 2 diodes. The resistor would be wired to the NC contacts to reduce current drive to the LED when park/running lights were selected. When Stop/Tur...
by Tparker
Tue Apr 20, 2004 9:22 am
Forum: General Discussion
Topic: Led Constant Current driver help
Replies: 8
Views: 2097

Led Constant Current driver help

I need some help in designing a circuit to add to constant current LED driver module available here. http://www.leddynamics.com/LuxDrive/Page_Buck.html I want to use a single 5 watt Luxeon Star LED as a tail/stop/turn signal. When the tail/running lights are turned on the output from the module woul...
by Tparker
Fri Apr 09, 2004 1:47 pm
Forum: General Discussion
Topic: Need help with a simple transistor circuit
Replies: 8
Views: 1912

Re: Need help with a simple transistor circuit

There are digital and analog transmission temp gauges available with switched outputs, the setpoints user defined. This output signal could trigger a relay to operate the fan. This might be an option instead of trying to interface with the oem sensor. Available from www.summitracing.com for approx. ...
by Tparker
Tue Apr 06, 2004 10:13 am
Forum: General Discussion
Topic: Fwd. Voltage drop across silicon diode
Replies: 9
Views: 1862

Re: Fwd. Voltage drop across silicon diode

Thanks guys for your input. The diodes will be used in an automotive LED warning light application to prevent feedback.
by Tparker
Mon Apr 05, 2004 12:57 pm
Forum: General Discussion
Topic: Fwd. Voltage drop across silicon diode
Replies: 9
Views: 1862

Re: Fwd. Voltage drop across silicon diode

Is the voltage drop any more/less depending on current? Suppose you have a 50 volt 3 amp silicon diode that has 250 ma. thru the circuit, would the voltage drop be the same if 3 amps were thru the circuit?
by Tparker
Mon Apr 05, 2004 8:00 am
Forum: General Discussion
Topic: Fwd. Voltage drop across silicon diode
Replies: 9
Views: 1862

Fwd. Voltage drop across silicon diode

Looked at a few datasheets on the 1N400X series of diodes but did not see any specs. on voltage drop. Is there a standard voltage drop across all silicon diodes and is the amount of the drop current dependent?
by Tparker
Thu Feb 26, 2004 9:04 am
Forum: General Discussion
Topic: Automotive dual battery question
Replies: 29
Views: 6042

Re: Automotive dual battery question

Thanks guys for all the input. All of your responses make sense. On the F-rd Diesel truck forum that I belong to, an "Auto engineer" feels the pass. side cable is 2/0 becasue it carrying the full current load and the drivers side battery is only carrying approx. 1/2 the current.
by Tparker
Wed Feb 25, 2004 8:48 am
Forum: General Discussion
Topic: Automotive dual battery question
Replies: 29
Views: 6042

Re: Automotive dual battery question

A little more information. According to the Service manual max. load of the starter is 2400 amps. I would assume that this is the starting surge amperage to get the starter spinning. One thing that I need to add is the 700 amps DOES NOT include the glow plug current draw which is over 100 amps or un...
by Tparker
Tue Feb 24, 2004 1:55 pm
Forum: General Discussion
Topic: Automotive dual battery question
Replies: 29
Views: 6042

Re: Automotive dual battery question

Chris Smith,<p> Not sure I follow you. The 2/0 cable to the starter is approx. 4' long. Are you saying that the wire size between the 2 batteries makse no difference and they will always share "equal current",ie, 350 amps?
by Tparker
Tue Feb 24, 2004 8:30 am
Forum: General Discussion
Topic: Automotive dual battery question
Replies: 29
Views: 6042

Automotive dual battery question

I have a diesel pick-up with dual 750 CCA batteries wired in parallel. The passenger side battery has a 2/0 cable running directly to the starter. The drivers side battery is connected to the pass. battery thru a 5 foot length of 4 gauge wire. According to the shop manual, starting current can be as...
by Tparker
Fri Feb 20, 2004 1:22 pm
Forum: General Discussion
Topic: Amps or watts?
Replies: 13
Views: 2893

Re: Amps or watts?

Waytekwire has automotive/truck/bus fuses up to 250 amps and circuit breakers up to 150 amps.
by Tparker
Thu Dec 18, 2003 12:22 pm
Forum: General Discussion
Topic: WHITE LED FLASHLIGHT
Replies: 8
Views: 2264

Re: WHITE LED FLASHLIGHT

Its pricy but here is a 1.2 watt plug and play Luxeon Star LED in a PR mount that will fit any flashlight that takes a PR type bulb with 1-6 cells. http://www.ledsupply.com/evflbu.html<p>[ December 18, 2003: Message edited by: Tparker ]</p>
by Tparker
Thu Dec 18, 2003 10:45 am
Forum: General Discussion
Topic: White LED strobe
Replies: 40
Views: 8647

Re: White LED strobe

I made a strobe flasher to alternately drive 2 LED arrays out of 3 555 timer chips. 2 of the chips are configured to run at approx. 8HZ and the third chip running at 1HZ (.5sec. on /.5 sec. off) controlls on/off of the first 2 chips. The third chip has the "diode mod" to run at a 50% duty cycle. Giv...
by Tparker
Sat Oct 18, 2003 8:37 am
Forum: General Discussion
Topic: Problem with motorhome lighting
Replies: 7
Views: 1764

Re: Problem with motorhome lighting

The transistors are mounted on 2 seperate heat sinks that seem adequate. One transistor did show signs of high heat and its phenloic mounting socket came apart when I removed the transistor. I also noticed that no mica insulating "washers" were used and found no evidence of any heat sink compound (t...