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I am currently working on a few projects at a time. One boat, a Police Launch, has several working lights that I have aded as extras. I have quite a bit of available room so I have used 7/0.2 equipment wire for all of the LED`s. For my Pilot Boat, I have very little room to run the wires and so will have to reduce drastically. I cannot seem to find smaller wire which leads me to believe that I am looking in the wrong places. Please can I ask for advice as to which wire size I should be looking for and where to look for it. I like to colour code the wires also to make fault tracing easier, so multiple colours would be an added bonus. Thanks. Peter.😊
Hi Peter, I use gpo telephone wire, the black outer cover has either 3 or 4 pairs of colour coded wire, it strips and solders very easily. I usually ask a bt engineer for offcuts when I see them working in my area. The od of the outer cover is about 8mm. The individual wires are about 1.5 od over the cover. Hope that this will help you. Cheers Colin.
The inards of USB cables is very small, and stranded. Often available for few $ at thrift shops. I find WW wire (30ga) plenty robust for most things, used it a LOT in the 70's for backboards on mainframes. Solders very well. If the runs are long-ish then add a clip every few inches for support.
If you need really really thin then magnet wire would be your next option. There is solder-able stuff available where the insulation dissolves under high temperature. Insulation is otherwise quite robust.
Just to provide some more specifics on overall diameter, I have WW wire that is 30ga but the insulation adds variable amounts to that. E.g. one is 0.43mm dia, another is 0.75mm diameter. The solder-able wire that I use is 0.15mm diameter. That is available here: http://www.roadrunnerelectronics.com/epages/BT3782.sf/en_GB/...
I still occasionally wire prototypes up using the Vector P173 wiring pencil :-)
Hello, try looking for old 25way data cables at your local car boot sale. The cores are multi-coloured and very thin. Most LEDs only use a breath of current to drive them so you won't start a fire! Here's a tip about dropper resistors for LEDs: put them at the power supply end where you can tie them down securely. Also, the formula for finding the resistance you need is: R equals Volts(supply) minus Volts needed by LED (Vf) divided by the required LED current (If). So, say 12V supply, 2V LED wanting 15mA = 12-2=10/.015 = 666.667, so you'd use the nearest value above, which would be 680ohms. Easy! The size of the resistor in watts/milliwatts is found by I(current) times E(volts), so 10X.015=.15W, or 150mW. Hope I'm not teaching an old sea dog new tricks! Starting a new Firefloat - oh boy.😲
I had an email from 'Haverlock' making the point that 'my' formula is no good for motors, etc. I agree. I did state it was for LED supply resistors. I found several references to this formula among which were 'Sparkfun' and the book "Introduction to Analogue Electronics". Any dissenters should take it up with RS - that's where I found it about 40 years ago. Case closed.