In this post we learn how to make a simple miniature lamp flasher circuit using some inexpensive transistors, resistors and capacitors. Let's learn the details below:
A lamp flasher is a device which is designed and used for switching a connected lamp alternately ON/OFF at a certain given rate per second. Meaning, a lamp or a light emitting device is switched ON/OFF rapidly at some given rate as preferred by the user, resulting in a blinking effect of the light or flashing effect on the light.
Such lamp flashers are used for warning devices, in police and ambulance vehicles, in airplanes, flashlights or any desired place where an emergency kind of situation needs to be indicated.
Alternatively a lamp flasher is also popularly used for decoration and in vehicles for indicating a turn signal.
The discussed miniature lamp flasher circuit presented here can be used in various ways. For instance, it may be built into an inexpensive decorative lantern at Diwali time, where it will catch the attention of passersby from as far as 15 to 20 metres. The circuit can be used to light up one or two bulbs (for two lanterns). When used for a single bulb, the light of course would be much brighter. The flashing rate of the bulb can be varied through VRl. The entire unit can be housed in a box of 60 x 40 x 15 mm size. It will cost ·approximately Rs 25 only to build. If one desires to operate the unit with a battery eliminator, and C4 can be omitted. But it is advisable to keep Dl in circuit as a protection against wrong polarity connection.