About us

Welcome to dynamoregulators.com

At DRL our focus is high performance replacement dynamo regulators to control the output of classic vehicle dynamos (generators). We pride ourselves on being the present day prime innovators in electronic dynamo regulator design. Our products include the DVR2, DVR3 and DVR4 regulators (formerly known under the 'manortec' brand). The various types are suited to many different motorcycle, car, boat, tractor... (you name it!) dynamo or dc generator powered vehicle electrical systems.

Take a close look at our range of rugged Voltage Regulators. Also our high quality dynamo belt drive kit for BSA A7/A10 twins, available from stock.

Why another solid state regulator?

Dynamo Regulators Ltd Designer & Director, Mike Hutchings

Mike Hutchings - Director

"Some years ago 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."

"Following 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 a long term active member of the Hampshire branch of the BSA Owners' Club, and has owned and ridden BSA's (and other bikes) all his adult life. He is a Chartered Engineer (Electronics) with an industrial background in Aero industry product development (engine accessories), sensor design and Condition Monitoring (oil analysis).

The graph shows the output voltage from a Lucas E3L dynamo (unmodified '6V' unit with 60 Watt rating) across a range of speeds for the DVR2 and another common regulator. A 40 Watt bulb was used as a test load. The much higher output from the DVR2 between 2,500 and 3,500 makes a huge difference in the effective battery charging at modest dynamo speeds. (Typically equating to road speeds of 35 to 50 mph on many popular classics.)

Useful Links

Read more about the DVR2 and its development in a Real Classic Regulator article published in January 2009. (Visit the Real Classic Magazine website).

There are many references to the DVR2 on these classic marque newsgroups - just use the forum's search facilities:

The BSA A7-A10 Forum

Velocette Technical Forum

Poor sparks from your magneto, difficult starting from hot? Often the cause is a failed condenser (capacitor). Brightspark Magnetos offer an innovative and cost effective solution. And a wealth of magneto and much other electrics related solid information. These guys really know their onions (well one of them is based in France).

A number of businesses use our electronic regulator units and fit them inside original regulator shells to maintain original appearance. One such is Classic Dynamo & Regulator Conversions. If in doubt please ask who supplies their regulators. It may also be of interest to search the web for references to DVR2, 3 & 4 to view a growing number of articles showing users own fitment of our regulators.