Specifications stated in this article
- Electrical values
- 1 330 ohms, 2 270 ohms, 3 470 ohms, 6 100 ohms, 100 ohm, 6 amperes, 10 ampere
- Temperatures
- 244C
Values are lifted verbatim from the text below and shown here for quick reference only. Always read them in context — many are model-specific or carry conditions.
Schematic diagram of one version of the Electronic Voltage Regulator
D+ Regulator input, from output of diode board and to alternator telltale lamp.
Df Goes to one brush/slip ring of the alternator rotor.
D- Goes to the other brush/slip ring of the alternator rotor, and to bike ground via a brown wire.
R1 330 ohms resistor R2 270 ohms resistor R3 470 ohms resistor R4 1.5K ohms resistor R5 1.2K ohms resistor R6 100 ohms resistor P 100 ohm potentiometer C1, C2, C3 100nF ceramic capacitors Q1,Q2 BC327 transistor
Q3 BD244 series transistor. BD244 rated at 45V; BD244A rated at 60V; BD244B rated at 80V, BD244C rated at 100V. Rating of all are 6 amperes and Vce-sat is max 1.5V ***Snowbum says that if replacing Q3, a higher current rated transistor is a good idea, such as 10 ampere. A lower Vce-sat would also be helpful for longer life.
D1 1N4148 diode D2 BZX6V2 zener diode, 6.2V D3 1N4003 diode, can substitute 1N4004, etc. D4 Diode has no markings, but a 10A, 50V or higher rated diode should be OK.
Related in this library
- IGNITION: Points; Timing lights; Ignition Modules; Ignition Canister (rebuilding yourself
- New batteries, ALL TYPES, including lithium. Filling a flooded battery & initializing prop
- The Alternator/Charging System. Operation. Troubleshooting
- Aftermarket Alternators: installation, capability, performance. Bosch, Omega, Emerald Isla
- Ignition Theory; simple + in-depth, nerdy stuff too, ......>>Spark Ignition Systems
- Ignition timing; automatic advance units for single and dual-plug engines; points; condens
Author. This article was written by Robert “Snowbum” Fleischer. The technical text above is reproduced word for word from his website; the club has added the navigation, the specification digest, the model tags and the links. No sentence of his has been rewritten, shortened or re-ordered.
Original. https://bmwmotorcycletech.info/VRschematic.htm · author’s revision 05/31/2018