Leaderboard

Not cheating, sometimes I do the same - it's the time spent on Youtube getting the best version for the link that I get caught out on. Because I know the track and enjoy listening to it (and end up doing just that) - by the time I've got back to the forum to paste it, someone's got in first! As the saying goes at the nightclub "if you procrastinate, you masturbate"!

This is what I was .... .....posting until being gazumped IMO a fantastic version, which I stumbled accross ages ago. Now, seeing that I have set my own rule of having to physically own what I post, I've had to order it on CD!!

That's the handy PCB I made with space for fuse, reverse protection, capacitor and Overvoltage protection diodes with the DCDC converter. Useful when you need to bury a little power supply somewhere in a car

The LED will drop 2.4V, that's fixed, so you just need to drive with a source of at least 2.4V. Then you need to limit the current to 800mA so the LED doesn't burn out (resistor or other current limiter circuit) The LED will generate a lot of heat, nothing you can do about that, but the rest of the heat comes from the power dissipated in the current limiting. So if you drop the voltage close to 2.4V efficiently (eg 3.3V), you have less waste heat to manage as you're only running 0.9V * 0.8A = 0.72W on a resistor

I use DCDC converters instead of linear voltage regulators in my Freewheel relay receivers because they are mega efficient. You can even get ones that are footprint identical to the common regulators, like this 3.3V 1A unit. https://uk.farnell.com/xp-power/vr10s3v3/dc-dc-converter-3-3v-1a/dp/3525426 I have a little circuit board for mounting it with a TVS protection diode and thermal fuse if needed that I can grab a picture of later

That would work fine. The 'buck' converters are very efficient so heating would be minimal. 5V going in to the current limiter/LED would give you a Watt of power dissipation in the LM317 so would raise it about 25C over ambient. Fix it to the alloy (using an electrically insulated mounting) for extra safety, but not essential.

Spoilsport

On the cold calling, my board son Answered a call and they asked if that was Mr Turner, he replied truthfully that it was and then kept him selve amused for ages. Eventually when he'd led them a merry chased he told them he was not the home owner so could not take up there offer. I don't think they were ammused.

Done in lieu of Dave

@OldStager I thought I would post an update. We have had our asbestos garage roof replaced today. It took the 2 guys 2.5 hours in the cold wind and rain. The anti drip coating got wet at the edge and he was able to demonstate how absorbant it is and how quickly it dries out, which was good. We are really pleased with it.

Dave I used DbPoweramp to rip mine as it tags and finds you artwork too. It's a great bit of software and not expensive. You used to get a 21 day full function trial may still be there

They were just annoyed you were going through the Motions, Jeff!

For the census I will always be truthful and over the years the questions have got more "wide" than they were. The gender one is insane to most people and having several Gay friends of both sexes they are as bemused by some of the names people identify, as none gays are. I get that we are changing many things but realistically whatever you call yourself is irrelevant to medical needs or if your bins get emptied, but this is the brave new world we live in. However for amusement my wife and I both fill in surveys with complete and utter tosh on them to ty to confuse their algorithms and yes will happily keep some callers on the line for a long time. The last was when they were doing the "have you had food poisoning when aboard. 20 mins answering questions and describing in detail my movements etc, which you could tell they were rubbing their hands at and when I finally told them it was all made up and they were the lowest of the low to encourage people to commit fraud, which is what they were doing by encouraging you to exaggerate the claim, they were less than pleased and quite abusive, which was nice

Tell the cold callers that they can come round but not this week as you're going to be in the bankruptcy court for a couple of days. Variations on this theme to suit. Me? I just hang up if I have even picked up the phone in the first place. I kid myself that an answered number will only get logged as 'real' and will attract yet more calls.

ok Im back in😀

https://uk.farnell.com/murata-power-solutions/oki-78sr-3-3-1-5-w36-c/sr-dc-dc-converter-sip-module/dp/2102100 you could maybe do better with this?

Thank you for the apology, no offense taken ✌️😀

Do people lie in wait to gazump me while I'm fetching links?! Disregard my post above.

Easy money to Big Fat Money...

@Quinten Uijldert - Webmaster the current sense resistor is going to dissipate a fraction over 1W, the regulator dissipation of course depends on the supply voltage. The device itself is rated at a max temp of 125C, so assuming no heatsink, would be good for between 4 and 5W dissipation (23C/W). Bolting it to the alloy ‘coaster’ would help that significantly. Need to know your intended supply voltage really.

Red light...Dutch bloke...I’ve got no ideas.

I dodn't think anyone was suggesting otherwise and if that's how you took my comments then I apologise. I was more commenting on the similarities some fish have to actual Koi which are valuable. But obviosuly I phrased it badly...

Absolutely, bit of angle iron and some M8 bolts, we'll soon have you load-bearing again!

A coaster sized heat sink should be sufficient, it's just about surface area and its ability to dissipate the heat. I've been messing with LED's since the 80's ( they were rubbish back then) although many did end up in semiconductor heaven as I played with things. Can't wait to see what it is you are building now....

Sorry all not having a good day Chris

Thank you John, a PM chat is underway...

It may help if you tell us it's intended purpose? Hence we could then possible suggest an off the shelf item, that's suitable etc. I'm guessing rear fog/brake light?

No worries, I did copy and paste it in a text doc, but do PM your full name in a PM, the last time I went to the post office with just 'Fred' on the package he wasn't too impressed, lol.

Sounds like me back in the motorbike days, always in bits, rarely saw a road - and if it did was in bits again pretty soon after, a certain Honda Goldwing comes to mind. grrrr. Oh and I moved here from the Wirral - Pensby, wish I was back there.

No direct car link for me in my career. I work in online marketing, design and web development day-to-day after pursuing a Computer Science academic path through uni originally. However back at A-levels my school could only offer IT or Engineering (not both) on the timetables which were my two loves and I was forced to choose. I think my Westfield is probably that engineering scratch being itched later in life (along with the lifelong motorsport obsession inherited from my Dad). However I'm well over my head most of the time though which is why it is constantly in bits, but at least I've got some arty photos and a blog to document its perpetual destruction.

I use two of SMD ones above ^^, in series on the back of the Westy, I could have used a regulator but didn't. It was a far neater job to just use a 25w 6 ohm resistor, this is mounted in the airflow under the car and it's heatsink is the chassis. Been working like that for around 8 years so far, never over heated yet. ETA As Chris has mentioned if using a reg, you will need a decent heatsink, if mounting in an alloy box, the box itself would do, if it's plastic then a multi finned alloy one will suffice. I may have some knocking about as I used to muck about with stuff like this some years ago.

It is, but bear in mind how much power the regulator will dissipate too. (Input voltage - (2.4+1.25)) x 0.8. You may well need to put it on a heatsink, which will bulk it up. You might be able to use the enclosure of the device for that, depending on what it is. Don’t forget the resistor power dissipation either. The accolades for electronics-fu should go to the blokes that design and manufacture the devices. Many years ago a colleague got stuck in to designing a video amplifier using discrete components. It was a lovely piece of work with impressive specifications. He was understandably miffed when I pointed out it had already been done....you could buy what he had designed in an 8 pin package for about £2, with better performance too.

oh and another one, if I get a double glazing company really insistent at quoting me I wait till they have said their bit and when asked where I live, tell them, Van 6 , New Quay caravan Park Cornwall.

TEE-SET - MA BELLE AMIE

To me, all music is worthy! 😁

This section of the forum can be browsed by both the whole world, and any bots looking to archive the pages, or gather personal data. I’ve hidden the address info posted. It’s much, much safer to send such contact details via PM, just give me a shout if you need help doing it, it’s not a problem at all. Stay safe!

and you keep it black side down

Has this thread done it's dash? After about my third post on in this thread, I made up a list of all the tracks I wanted to slot in to it as it went along, but as it looks like it's done it's dash, and I have two left to include, I'll dump them in now. If the thread picks up again at some point, I'll play it off the cuff. It's been a great thread over the dark months, with several new tracks to me that I have downloaded, so I thanks everyone who contributed. 👍