Without a battery

[thackers]

Is it possible to run a koso tacho without a battery? Obviously I'm not electrically minded so if there is a way, simple explanations and links would be great. Thanks

[wack 63]

I wonder if a 5 pin Vespa reg or Varitronic gives out enough to run a gauge? What about a Modcharger? Thinking about it , if it's the round type tacho that sweeps when turning on then it needs a permanent feed to keep it's settings.

[thackers]

Hi Lloyd, it's a digital readout. I've done a forum search and found someone who had the same problem and he used a "bridge rectifier" or something to convert AC to DC or the other way around, i'm not sure. Another forum member gave some links to ebay items but it was back in 2010 and the one who asked the question hasn't been an active member since.

[wack 63]

It would be handy to know if you find a solution Dave.

[carlos fandango]

koso do a small rectifier , ive used one in the past and velcroed it to the inside of my headset
http://www.digital-speedos.co.uk/12-vol ... -132-p.asp

[molibdimum]

Sorry to rob your post Thackers but I wondered if this Koso rectifier thingy would help to get a better sound from the standard Lambretta horn??

[EddieStone]

Sorry to rob your post Thackers but I wondered if this Koso rectifier thingy would help to get a better sound from the standard Lambretta horn??

Doesn't look like it. It handles about 6W and a horn would draw a lot more power than that. You could try and put a bridge rectifier (four diodes) in the horn circuit and replace the horn with a DC type. That would stop it sounding as buzzy. You'd need some hefty diodes though, to handle the current.

Those DC converter thingies are pretty easy circuits build yourself - components would cost about £3. I'm happy to have a go at making one if someone wants to try it?

(As long you're not in a rush - A lot of my time is taken up with the Li in the lounge....)

[vicvega]

http://www.amazon.com/Autek-Converter-R ... B00KM0U7RE would this do the same thing?

[EddieStone]

http://www.amazon.com/Autek-Converter-R ... B00KM0U7RE would this do the same thing?

Yep. That has a lot more power capability than the other one - it can supply up to 3A and 24W, compared to the 0.5A/6W of the Koso.

[EddieStone]

hang on, though - it needs 15V minimum, which a scoot is not likely to generate. Is there one that has a lower minimum voltage, say 10V or so?

Edit: This would do it: https://www.superbrightleds.com/moreinf ... dule/1725/