Why another solid state regulator?
Dynamo Regulators Ltd Designer & Director, Mike Hutchings -
"A good couple of years back now I converted to a 12 Volt electrical system on my 1960 BSA A10, employing a commonly available electronic regulator. At the same time I fitted electronic ignition to replace a worn out auto advance unit and tired magneto. With the updated ignition now dependant upon battery charge the efficiency of its charging system became critical. The regulator I had chosen struggled from the start to maintain a decent charge rate. At one stage I ended up with a flat battery during daytime riding. No lights, just the ignition drain of about 2 Amps (plus the low speed redundant 2A field current) was a problem following much local bimbling around. Fitting a belt drive kit to increase the dynamo speed by 25% or so helped. But as an electronics designer I realised that a better regulator solution should be possible. . . . .
After some serious development effort the first DVR was produced and proved very effective on the A10, and then on a number of other machines. Charge balancing speeds were a good 20% or more lower, and regulation across the rev. range improved. Headlight drain balanced at 10 mph slower in top gear on the BSA....a real result! The improved charge can clearly be observed at the ammeter. A refined unit has subsequently been designed which uses highly reliable Surface Mount components, and with added circuit protection against mis-connections and overload. This design is the version now available as the DVR2."
(Mike is currently Secretary of the Hampshire branch of the BSA Owners' Club.)
Read more in a Real Classic Regulator article published in January 2009.
(Visit the Real Classic Magazine website).
The DVR2 regulator is also referred to in an article by well known BSA man Brian Pollitt, who now runs Lightning Spares.
See his January 2009 addition to 70,000 MILES ON A BSA A10, page 5.
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You can find a lot of references to the DVR2 on these classic marque newsgroups - just use the search facilities -
