Upgrades to Audi key

[HPmuirt]

Step-up transformer? Anything less and i wont be impressed, Si

So, impressed Sonic?

Cheers n

Si

[Sonic]

Suitably impressed

[HPmuirt]

Suitably impressed

Thanks Andy, I am glad finally someone is impressed (unlike Fatty who wouldn't recognise genious even if/when I run over his foot with my Coupe ) as I was rather chuffed with my work.

Cheers n

Si

[newsh]

I am totally impressed, how did you make the DC into AC?

[HPmuirt]

I am totally impressed, how did you make the DC into AC?

Why thankee, that's 2 impressed, just another 9,476 members to go (I've given up on Fatty )

All DC by the way matey

Cheers n

Si

[maddagent]

Make that 3! that step up transformer squeezed into the key is just excellent. I really love things like that. Top Top job. To some it may just be a light on a key but that real problem solving right there!!!

[HPmuirt]

Make that 3! that step up transformer squeezed into the key is just excellent. I really love things like that. Top Top job. To some it may just be a light on a key but that real problem solving right there!!!

Cheers matey

9,475 to go

Cheers n

Si

[Wheeljack]

Very nice!...but I am a bit confused...you must at least be switching somewhere to create di/dt and interact with the inductor, yes?

[HPmuirt]

Very nice!...but I am a bit confused...you must at least be switching somewhere to create di/dt and interact with the inductor, yes?

Yup, it is indeed switched, you just cannot see that very well with the poor picture taken on my phone.

So whilst Einstein might be spinning in his grave, Ohm would not be

Cheers n

Si

[johne]

Impressive

The LED will do the AC to DC conversion for you and the little 3 legged semiconductor hidden in the corner to do the switching.

I think I'd have gone the use a lithium coin cell replacement to get the 3 volts or even two 1.5 volt silver cells in series as the easier option...........that said my key fob, battery and bulb are 15 years old, all original and still working fine.

John

[newsh]

I'm not daft, I know DC won't go through a transformer...

[Rikki Kitto]

I am so impressed I would like to post my key to you for the upgradehow much is it?

[HPmuirt]

I think I'd have gone the use a lithium coin cell replacement to get the 3 volts or even two 1.5 volt silver cells in series as the easier option

That was my first thought, but I could not find a lithium coin cell the same size as an LR9. Next I was going to use a smaller lithium cell and "pad it out" a bit but I had always fancied doing this as I knew the theory and liked the challenge of making a miniature version.

Cheers n

Si

[HPmuirt]

I'm not daft, I know DC won't go through a transformer...

Err, but this is effectively a simple buck-boost converter (DC-DC converter) - like a really simply version of the type found in every mobile phone or in LED path lights etc

Cheers n

Si

[4WheelDrifter]

Nice one Si. I like it.
Amazingly my S2 torch key still works, I just checked. But I wouldn't mind an upgrade.