Ruud
many thanks for the very helpful information.
I have already ordered a step down converter as suggested by Dave but I think I'll get some resistors and also try it that way as a mini-project (I must get out more!)
yesterday I got the idea of using two 6 volt batteries in series, you can charge them with a 12 volt regulator , and for the horn you use only one battery of 6v .
I have been in electronics more than 45 years and the problem is always the mechanical packaging ... The electronic function is not the problem, but the challenge is always to get it mechanical well installed and mounted. ( so a resistor is a crime to mount it on a bike)
2 x 6 volt batteries must fit into a dummy battery box..again a challenge.
I liked the idea of using the step up converter . By just using this one for the LED lamps which are widely available for 12 volt use. Benefit of the step up converter is that the voltage can drop down and the output stays the same . for LED lamps this is very important since decreasing voltage will result in a significant light output drop down.
another benefit is one can use the original 6 Volt dynamo unfortunately with the bad 6 volt regulators of Lucas. ( these are unreliable devices and so they destroy either your battery or/and the dynamo...)
I started long time ago on my matchless and triumph's to install a 12 volt battery with LED lamps. I "disconnect" the dynamo by removing the chain on the matchless ( terrible adjustment chain). Since the Alette Horn didn't work I have solved the 12 volt issue. So I charge from time to time the battery with a external charger.
and the TRW triumph I mounted a Triumph trident 12 volt horn that worked after it had been in parts for more than 30 years...
on my latest 3HW project I have to check if the dynamo works ( I am not going to spend a fortune in rewiring the rotor) , if not we go for 12 Volt battery and LED only solution without horn...
I run 12 volt electrics on my WM20. Have two 4.5 amp gel batteries fitted into old battery casing but still retain a 6 volt clear hooters horn been this way for 8+ years no problem.Also use 55/60w H4 headlamp bulb I can now see where I am going at night..
2 cyclone 6v batteries will fit in a dummy case and can be connected for 12v if required. They seem to hold a charge for ages when the bike is laid up.
