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6 V Dynamo Regulator

For vintage motorbikes

6 V Dynamo Regulator
This ’bulletproof’ electronic regulator was originally designed to replace the troublesome original electromechanical regulator on the author’s vintage BMW/EMW R35 motorbike. A large number of BMW/EMW devotees have since successfully tested this unit on their machines without problem. The design is universal and should be suitable for all bikes using the same switched-earth field regulation method.
The author designed this regulator for his EMW R35-3 motorbike. The bike was built by Eisenacher Motoren Werken (EMW) based upon the prewar R35 machine from BMW. Production of the bike continued for many years after 1945.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

(SMD case 1206)
R1 = 6k8 (see text)
R2,R5 = 4k7
R3 = 100?
R4 = 1M5
R6 = S05K20 (varistor)
(SMD case 1206)
C1 = 4nF7
C2 = 3µF3 (ceramic multilayer)
D1 = LL4148
D2,D3 = zener diode 5V1 (SMD)
D4 = zener diode 9V1 (SMD)
D5 = EGP50D
D6 = BYV32E-100
T1 = BTS115A
IC1 = MAX291
PCB, ref. 050241-1 from The PCB Shop
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