Lantern with dimmer and flasher

Posted on Aug 12, 2012

The electronic lantern control circuit adds high-efficiency dimming and flashing to an existing battery-powered lantern or flashlight or to a custom design. For the car it makes a great lamp for changing a flat tire, back seat reading or emergency engine work. The flasher mode is useful for warning other drivers of your troubles and it may be adjusted to have a very short flash duration for long-term use as when the car must be left on the shoulder over night.When camping it is great as a low-power night light for the tent or the portable 'potty'--you may select only as much light as you need!

Lantern with dimmer and flasher
Click here to download the full size of the above Circuit.

The flasher mode is useful for finding a boat dock in the dark or even attracting fish. At home, the flasher is a great way to tell guests when they have found the right house or to "jazz up" battery powered holiday decorations. The circuit is intended for 6 or 12 volt lantern batteries but it should work well with supplies from 4.5 to 15 volts without any modifications to the circuit as shown above. Except C1/C3. If you intend to use 12 to 15V, increase the working voltage of these two capacitors to 25V instead of the listed 16V. In dimmer mode (switch S1 open), the circuit send rapid variable-width pulses to the bulb to control the brightness and in flasher mode (switch S1 closed) the pulse rate is about one per second. Very short flashes will give a greatly extended battery life. The TIP32 remains cool since it switches on and off instead of simply dropping the voltage like a power rheostat. The components are not critical and substitutions are fine. Almost any general purpose op-amps or comparators will work in place of the LM358. The two transistors may be replaced by a power FET if desired simply by connecting the gate to pin 7 of the Op-Amp, the source to ground, and the drain to the bulb. The other end of the bulb connects to the positive terminal of the battery in this case. There is nothing particularly critical about the resistor and capacitor values and the experimenter may change them, if desired. For...

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