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Model Railroading > BLMA Searchlight Signal HeadsDate: 06/21/12 15:53 BLMA Searchlight Signal Heads Author: dgraves I have purchased BLMA item #4001, searchlight signal heads. The instructions say that the max voltage is 2.2 volts. Anyone know what size of resister would be needed if I hook these up to a 12V power supply?
Date: 06/21/12 18:02 Re: BLMA Searchlight Signal Heads Author: 1stcajon Get their phone # of website & give Craig a call. Have had good experiences getting problems solved that way.
Date: 06/21/12 18:45 Re: BLMA Searchlight Signal Heads Author: mongo what is the current draw on the signal. if you know this it is a simple calculation. voltage=current times resistance. you will need to drop 10V. so you would divide 10V by the current draw and that will give you the size resister you will need. Basic electronics.
Mongo Date: 06/21/12 20:02 Re: BLMA Searchlight Signal Heads Author: barrydraper 1000 ohms. Also called 1K ohms, brown, black, red & gold or silver stripes. One resistor can be used on the common positive wire if only one LED is lit at a time. This isn't rocket science!
Barry Draper For those that want to do the calculation themselves it (supply volts -2.2)/ .01 = resistance needed for a nice bright 10ma though the LED. Date: 06/22/12 04:17 Re: BLMA Searchlight Signal Heads Author: CR4103 Haha not rocket science, right and my parents vcr is flashing 12:00. For the last 10 years. Yes i said vcr!
Posted from Android Date: 06/22/12 07:37 Re: BLMA Searchlight Signal Heads Author: NdeM barrydraper Wrote:
------------------------------------------------------- > ...This isn't rocket science! Wow, thanks for the positive note! Not everyone studies electronics and physics for fun. Date: 06/22/12 15:06 Re: BLMA Searchlight Signal Heads Author: espeesGeeps I Believe Those searchlight signals run 3 LED's, Red, yellow, Green so you would need 3 resistors one for each LED. Good luck on your Signal Project
Date: 06/24/12 06:43 Re: BLMA Searchlight Signal Heads Author: ATSFSD26 Actually Barry,
Given the organisation that posted Ohm's Law information on the following website, it might just be rocket science (VBG) http://www.grc.nasa.gov/WWW/K-12/Sample_Projects/Ohms_Law/ohmslaw.html cheers Dave (Seriously, I agree with you. These are basic formulae that model railroaders should learn and know) |