There are two circuit modes: dimming and flashing. 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.

Electronic Parts List:

Lantern Dimmer Circuit Notes:

• S1 switch is used to activate the ‘Flashing’ mode.
• P1 is the dimmer potentiometer, you can adjust the dimming setting from here.
• Transistor 2N4401 can be substituted with a NTE123AP, the BC547.
• Transistor TIP32 can be substituted with a NTE197. Other transistor types might be work.
• The DC power supply or battery for this lantern dimmer / flasher is 6-12V.

There is nothing particularly critical about the resistor and capacitor values and the experimenter may change them, if desired. For example, a 10K-pot may be substituted for the 5K by increasing the 3.9K resistors by 2 also (8.2K would be fine). The 100K’s in the flash circuit may be a different value if the capacitors are also scaled (inversely–if the resistors are doubled, the 0.1 and 10uF are halved).

Good luck…

The post Lantern Dimmer and Flasher appeared first on Electronic Circuit Diagram.