Regulator 6V 3W for a Hub Dynamo bicycle This is a regulator for a 6V/3W bicycle hub generator system. The purpose is to manage the powering of bicycle lights from the hub generator and from rechargeable batteries, to charge the batteries using excess power from the generator, and to provide intelligent charging of the batteries from an AC adapter, when needed….

Dynamo Current and Voltage Regulator by TL084Let’s start analyzing the circuit in idle condition, when the engine is stopped. The battery voltage at B+ cannot pass to D+, because D1 blocks it. D+ is at ground level, because of the low resistance of the dynamo between D+ and D-. Q1 is biased off, which leaves the negative side of the entire OpAmp circuit floating….

Bicycle Speedometer With Hub Dynamo The idea for this circuit came when the author had problems with the wireless speedometer on his bicycle. Such a device consists of two parts: the cycle computer itself and a transmitter that is mounted on the front fork. A small magnet is attached to the spokes so that the transmitter sends out a pulse for every revolution of the wheel….

Rear Light After Glow (For Bicycles)This article is of interest only to readers whose bicycle lights are powered by a dynamo. The laws on bicycle lights in the United Kingdom are stricter than in other countries and a dynamo is, therefore, a rarity in this country. From the point of view of traffic safety it is advisable (in UK obligatory) for cyclists to have the rear lamp of their bicycle to light even….

Power supply regulator for BicycleThis is a regulator for a 6V/3W bicycle generator system. The purpose is to switch to rechargeable batteries when the generator is idle. In addition, the device limits the voltage across the bulbs when the generator operates at a high speed….

Light Flashing Car 12 Volt using LM3900 If you have evered to use Flasher Relay 12V systematic usual mechanical , for general automobile. Today we try to come to build Circuit Flasher Relay 12V….
LED Dimmer Universal 2-Channel 12 Volt DC LED Lighting Dimmer Controller This self-contained 2-channel 12 volt dimmer and on/off switch is designed for precise control of interior accent lighting in your auto, truck, RV, boat or aircraft….
LED Fiber Optic Night Light Reverse engineered circuit diagram of a commercial LED fiber optic night light. The circuit board and LED’s are mounted inside a plastic case with ventilation holes. The light is particularly bright….
12 Volt Fluorescent Lamp 20W Drivers Here is the schematic diagram for a 20 Watt driver. I developed this circuit in 1985, and used it to build a lamp that found much use both as camping light and as emergency light during the then-frequent power outages….