Automatic switch-on when it gets dark, 6V or 3V battery operationThis design was primarily intended to allow automatic switch-on of push-bike lights when it gets dark. Obviously, it can be used for any other purpose involving one or more lamps to be switched on and off depending of light intensity. Power can be supplied by any type of battery suitable to be fitted in your bike and having a
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Tampilkan postingan dengan label bike. Tampilkan semua postingan
Tampilkan postingan dengan label bike. Tampilkan semua postingan
Sabtu, 06 April 2013
Kamis, 04 April 2013
Posted by kumit on 10.30
with No comments so far
On my mountain bike I always used to have one of those well-known flashing LED lights from the high street shop. These often gave me trouble with flat batteries and lights that fell off. As an electronics student I thought: �this can be done better�. First I bought another front wheel, one which has a dynamo already built in the hub. This supplied a nice sine wave of 30 Vpp (at no load). With
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Kamis, 28 Maret 2013
Posted by kumit on 21.30
with No comments so far
This circuit automatically turns a motor cycles headlight on and off, independently of both the light and ignition switches, provided the battery is fully charged. The first stage uses the 22O resistor and ZD1 to hold transistor Q1 off while the motor is not running; it draws about 2mA. Once the battery voltage exceeds 7.0V during charging, Q1 begins to turn on. The last stage uses the 22O
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