CIRCUITS FOR DYNAMOS & HUB GENERATORS

BICYCLE STANDLIGHT UNITS


The SL-01 circuit is based on the Sturmey Archer FSU unit, but miniaturised. It has not been tested and is offered as a suggestion only. We will be very pleased to receive feedback.

COMPONENTS

BR = Bridge Rectifier 1A
D1 = Diode Rectifier 1A
S1 = Headlamp Switch (if fitted)
S2 = Switch in SL-01 unit
* (optional if S1 is fitted)
B1 = 3 x AA alkaline cells in battery holder
X1 = Regulator XGEN, XGEN2 or XGEN5

* With a Dynohub, S2 will select (a) strobing when moving (Nicelite LED Bulbs), or (b) continuous light whether moving or stationary.

Filament bulbs or Nicelite LED bulbs NL412, NL432, NL437R can be used. Only Nicelite bulbs will run at their full brightnes from the battery power when stopped.

Note that either the generator coil OR the lights must be electrically isolated from the frame, to avoid a short circuit at the bridge rectifiern (BR). Sturmey Archer Dynohubs and probably most modern hub generators are isolated from the bicycle frame.



The SL-02 circuit is based on the Sturmey Archer FSU unit, but miniaturised. It has not been tested and is offered as a suggestion only. We will be very pleased to receive feedback.

COMPONENTS

BR = Bridge Rectifier 1A
D1 = Diode Rectifier 1A
D2 = Diode Rectifier 1A
S1 = Headlamp Switch (if fitted)
S2 = Switch in SL-02 unit
* (optional if S1 is fitted)
B1 = 3 x AA Nickel Cadmiun Rechargeable Cells
R1 = Charge resistor
F1 = Fuse 1A
X1 = Regulator XGEN, XGEN2 or XGEN5
Bulbs = Nicelite NL412 or NL432, NL437R


* With a Dynohub, S2 will select (a) strobing when moving (Nicelite LED Bulbs), or (b) continuous light whether moving or stationary. Also with a Dynohub S1 probably needs to be open ("off") for battery charging as there may be no surplus power from the 2W Dynohub when two 1W Nicelite bulbs are powered. A charging socket for an external power supply could be included in SL-02.

Two Nicelite LED bulbs NL412, NL432, NL437R will run at their full brightnes while stationary on battery power only for almost 2 hours with fully charged 1000mAh cells.

Charge resistor R1 value must be chosen to avoid overheating the battery when fully charged. NiCd cells can accept over-charge as long as it is not excessive. Alternatively there are more sophisticated ways to control battery charging with IC chips. In this case other cell types such as NiMh or Li-ion could be considered.

Note that either the generator coil OR the lights must be electrically isolated from the frame, to avoid a short circuit at the bridge rectifiern (BR). Sturmey Archer Dynohubs and probably most modern hub generators are isolated from the bicycle frame.

COMING SOON:

1. CAPACITOR 30 SECOND STANDLIGHT CIRCUIT FOR NICELITE DYNAMO BULBS

2. LED CONVERSION CIRCUIT FOR MOPEDS & SMALL MOTORCYCLES WITHOUT A BATTERY
INCLUDING VELOSOLEX


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