Voltage Regulators

We believe that the performance of our electronic regulators surpasses that of other products available at any price. Key features are precise regulation, good low speed cut-in (no low speed discharge), fault protection, efficiency (=cool running) and small size. High energy voltage spike protection is incorporated. Accidental reverse battery protected when used according to the instructions included with every regulator. All of our regulators incorporate the cut-out function. (More details toward bottom of this page.)

Clear instructions are provided with all our products including connection diagrams. These are supplemented by much extra information on this website. DRL regulators are easy to fit by a typical classic vehicle enthusiast. Their robust &: attractive Alloy cases look good on show, or they can readily be incorporated into an original control box if preferred. Use DRL Regulator Products, proven in use by thousands of enthusiasts, worldwide, over many years.

On the product pages the Prices shown do not include postage. You must select the correct amount including Postage from drop down price box on the product page. The Options are for delivery in the UK, Europe or Other Countries (Rest of World). Prices reflect the higher postage charges we incur. Many thanks.

DVR2

DVR2™

£48.00 + Packing & Postage

The DVR2™ regulator is our well known highly regarded electronic dynamo voltage regulator for most motorcycle and other lower output dynamos.

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DVR3

DVR3™

£72.00 + Packing & Postage

The DVR3™ is a high output electronic dynamo regulator & cut-out with current limit up to 22 Amps (also available up to 40Amps at additional £10 cost). It suits many classic cars, tractors and watercraft with dynamos requiring live side regulation, that is with one end of the field winding connected to earth, e.g. Lucas.

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DVR4

DVR4™

£72.00 + Packing & Postage

The DVR4™ is a high output, current limited up to 22 Amps (also available up to 40Amps at additional £10 cost) electronic dynamo regulator & cut-out for so called 'series' connected field dynamos (e.g. Bosch & other European makes). That is dynamos requiring earth side regulation, with one end of the field winding connected to the live output brush.

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DVR2-D

DVR2-D™

£72.00 + Packing & Postage

The DVR2-D™ regulator/cut-out suits 2, 3 & 4 wheelers (and some watercraft etc.) fitted with Siba or Bosch Dynastart units

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Autolite/Jeep

Autolite/Jeep

£136.00 + Packing & Postage

This Autolite replacement regulator/cut-out assembly suits Jeeps & other vehicles. Up to 40 Amp output, 6 or 12 Volts, Type A or B Field connection

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belt_drive_kit

BSA A7/10 belt drive kit

£80.00 + Packing & Postage

For BSA A7/A10, this kit employs the widest possible 15 mm belt, and gears the dynamo speed up by 20%. A 'fit and forget' solution to an old problem area

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Some more product details

DRL's regulators all feature surface mounted high temperature rated components, machine soldered onto quality printed circuit boards (PCB) with heavy duty copper layer. The PCB assemblies are produced by UK based subcontract manufacturers to conform to all relevant manufacturing standards. We mount the PCB assemblies in machined Aluminium cases to ensure excellent heat transfer. The potting used provides complete protection from mechanical and thermal stresses as the regulators will often be situated in extreme engine bay conditions. We never have and never will use unreliable components in our designs, such as electrolytic capacitors or potentiometer adjusters which will degrade or lose adjustment over a period of use (due to heat and vibration). Furthermore we have never resorted to using microcontrollers in any of our designs, as the necessary functionality is most readily and elegantly achieved using conventional analogue techniques, despite the regulation itself being a low loss switching (digital?) function.

Every individual unit is tested prior to dispatch, usually on our motorised dynamo test rig, with our in-house designed electronic load simulator, which reproduces the worst case conditions which may be encountered in use. The DVR3 and 4 units employ high current MOSFET transistors to provide the cutout function. This feature gives these parts their very low heat dissipation (less than 3 Watts at 22 Amp output) so the units run notably cool, even with continuous full output current. It also means more power is available to the electrical loads on the vehicle and from lower speed.

The compact nature of the regulators all them to be fitted inside most sorts of original regulator enclosures. The DVR2 will fit inside an MCR1, MCR2, RB107 or RB108 case for example. The DVR3 comfortably fits inside an RB106 or RF95 case and of course the later and larger RB310 & RB340 series. The DVR2-D is specifically made to fit inside the 3 bobbin Dynastart controllers from Siba or Bosch.

The compact size of our regulators helps of make to electronic regulator conversion very straightforward, and practical for many, if not most enthusiasts with a little electrical ability. But please heed our advice: If in any doubt please employ the services of a qualified auto-electrician, or other competent person.

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